CNK

Line plots across dimensions of each concept
Line plots across concepts
Tables

Plots across concepts

IncomeStatement

Expenses

Balance Sheet

Assets

Current Assets

NonCurrent Assets

PropertyPlantAndEquipmentNet

Liabilities

Current Liabilities

Noncurrent Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

NetCashProvidedByUsedInInvestingActivities

NetCashProvidedByUsedInFinancingActivities

OperatingLeaseLiability

NonoperatingIncomeExpense

LesseeOperatingLeaseLiabilityPaymentsDue

FiniteLivedIntangibleAssets

Tables

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:CommonStockValue	█▇▇▆▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁	0.125	0.124	0.124	0.123	0.122	0.122	0.122	0.122	0.122	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.119	0.119	0.119	0.119	0.118	0.118	0.118	0.118	0.118	0.118	0.118	0.118	0.117	NA	NA	NA
us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock		NA	NA	123.627	NA	NA	NA	121.864	NA	NA	NA	121.457	NA	NA	NA	121.001	NA	NA	NA	120.657	NA	NA	NA	120.108	NA	NA	NA	119.758	NA	NA	NA	119.077	NA	NA	NA	118.503	NA	NA	NA	117.59328	NA	NA	NA	117.111	NA	NA	NA
us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:TreasuryStock		NA	NA	-5.052	NA	NA	NA	-4.712	NA	NA	NA	-4.626	NA	NA	NA	-4.526	NA	NA	NA	-4.447	NA	NA	NA	-4.184	NA	NA	NA	-4.057	NA	NA	NA	-3.695	NA	NA	NA	-3.553	NA	NA	NA	-3.392	NA	NA	NA	-3.36	NA	NA	NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding	█▁	117.225	117.177	NA	116.707	116.666	116.496	NA	116.6	116.548	116.418	NA	116.322	116.268	116.143	NA	116.104	116.072	115.915	NA	115.793	115.758	115.527	NA	115.356	115.328	115.058	NA	115.021	114.961	114.61	NA	114.449	114.387	113.979	NA	113.814	113.737	113.368	NA	113.298	0.113209	0.112899	NA	112.516	0.111552	0.11088
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic	█▁	117.225	117.177	NA	116.707	116.666	116.496	NA	116.356	116.325	116.179	NA	116.119	116.091	115.883	NA	115.823	115.785	115.629	NA	115.601	115.576	115.245	NA	115.164	115.148	114.837	NA	114.814	114.786	114.182	NA	114.05	114.007	113.447	NA	113.355	113.301	112.825	NA	112.817	0.112764	0.112542	NA	112.179	111.207	0.110547
us-gaap:EarningsPerShareBasic	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇██▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-1.19	-1.75	-2.03	-1.25	-1.45	-0.51	0.22	0.27	0.86	0.28	0.17	0.43	0.7	0.53	0.82	0.33	0.44	0.68	0.66	0.56	0.46	0.5	0.5	0.4	0.61	0.37	0.41	0.33	0.62	0.31	0.13	0.69	0.18	0.28	0.24	0.41	0.45	0.37	0.16	0.41	0.35	0.22	0.33	0.29	0.35	0.32
us-gaap:EarningsPerShareDiluted	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇██▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-1.19	-1.75	-2.03	-1.25	-1.45	-0.51	0.22	0.27	0.86	0.28	0.17	0.43	0.7	0.53	0.82	0.33	0.44	0.68	0.66	0.56	0.46	0.5	0.5	0.4	0.61	0.37	0.41	0.33	0.62	0.31	0.13	0.69	0.18	0.28	0.24	0.41	0.45	0.37	0.16	0.41	0.35	0.22	0.33	0.29	0.35	0.31

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization cnk:DigitalCinemaImplementationPartners,us-gaap:OtherAffiliates	█▁	14.098	5.624	NA	1.084	0.023	32.51	NA	40.2	48.007	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:RestrictedStock	▅▄█▂▂▂▂▂▂▂▂▂▂▂▁▁▂▂▁▁▁▃▂▂▂▂▂▂▂▂▅▂▂▂▂▂▂▂	4.716	4.23	7.238	2.832	2.712	2.691	2.729	2.587	2.436	2.433	2.389	2.468	2.423	2.375	2.086	2.004	2.167	2.127	1.699	1.843	1.807	2.901	2.458	2.406	2.146	2.59	2.27	2.278	2.37	2.616	4.915	2.7	2.535	2.588	2.633	2.607	2.863	2.534	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:RestrictedStockUnitsRSU	▄▃▁▅▅▅▅▄▄▃▅▄▄▄▄▄▄▄▅▃▃▆█▄▄▄▄▃▃▄▅▄▄▄	1.191	0.438	-0.693	1.595	1.609	1.42	1.4	1.253	1.24	0.537	1.583	1.018	1.029	1.051	1.108	1.039	1.036	1.114	1.448	0.744	0.735	2.217	3.45	0.969	0.831	0.908	0.984	0.697	0.696	0.907	1.625	0.858	0.803	0.862	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax	▃▁▁▃▂▃▇▆█▆▆▇▆▇█▇▇█▇▇█▇▇▆▇▆▆▆█▆▆▇▅▇▆▇▆▇▆▅▇▇▇▇	-133.462	-212.002	-221.544	-142.567	-173.242	-141.387	35.603	4.605	99.972	30.101	20.084	39.368	25.771	62.361	84.686	47.213	32.743	94.819	68.664	61.975	78.961	72.175	38.341	-14.204	68.071	-2.253	19.919	-1.383	82.091	29.03	17.29	67.241	-16.45	36.268	26.511	50.542	13.94	63.94	10.901	-28.189	50.506	37.609	52.986	54.253	NA	NA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	▅▁▂▂▂▅▆▇█▆▇▆▅▅▆▆▇▆▅▆▆▆▆▅▇▆▅▆▆▅▆▇▆▆▇▇▆▇▅▆█▅	0.186	-0.602	-0.418	-0.444	-0.427	0.169	0.505	0.602	0.89	0.465	0.6	0.393	0.329	0.156	0.401	0.401	0.571	0.466	0.291	0.475	0.473	0.53	0.481	0.327	0.626	0.387	0.318	0.392	0.405	0.259	0.45	0.621	0.413	0.512	0.571	0.593	0.398	0.682	0.291	0.407	0.845	0.26	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	▃▁▁▃▂▃▇▆█▆▆▇▆▇█▇▇█▇▇█▇▇▆▇▆▆▆█▆▆▇▅▇▆▇▆▇▆▅▇▇	-133.276	-212.604	-221.962	-143.011	-173.669	-141.218	36.108	5.207	100.862	30.566	20.684	39.761	26.1	62.517	85.087	47.614	33.314	95.285	68.955	62.45	79.434	72.705	38.822	-13.877	68.697	-1.866	20.237	-0.991	82.496	29.289	17.74	67.862	-16.037	36.78	27.082	51.135	14.338	64.622	12.704	-27.782	51.351	37.869	NA	NA	NA	NA
us-gaap:CostsAndExpenses	▃▂▃▁▁▅▇██▆▇▆█▆▆▆▆▆▆▆▆▅▆▆▆▅▅▅▆▅▅▆▅▄▅▅▅▄▄▅▅▄▄▄▄▄	380.109	283.799	385.238	246.262	223.249	586.535	722.367	763.286	801.704	657.355	721.773	671.497	762.385	677.729	661.301	636.573	652.974	648.417	616.162	650.784	638.842	590.042	608.129	600.929	665.439	554.96	563.879	564.619	600.997	534.425	571.28	622.374	591.605	482.144	525.382	539.42	535.697	489.33	474.404	538.703	523.592	434.38	457.318	486.447	459.672	444.838
us-gaap:GainsLossesOnExtinguishmentOfDebt	▁█	-3.924	-2.603	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0.0	0.0	-4.945	NA	NA	NA	NA	NA
us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument cnk:FivePointOneTwoFivePercentSeniorNote	█▁	0.0	-2.603	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:GeneralAndAdministrativeExpense	▅▅▂▃▂▆█▇▇▅▆▅▇▇▆▅▅▅▄▄▅▅▆▆▆▅▅▅▆▆▇▇▆▅▆▅▅▄▄▄▃▂▃▂▁▁	37.332	35.858	28.238	30.342	28.001	41.018	46.382	44.702	44.324	37.976	41.459	38.299	43.031	42.384	40.281	36.947	37.834	38.216	34.212	35.29	35.987	37.866	40.435	39.099	39.277	37.925	36.552	35.803	39.717	39.372	44.631	42.395	40.546	37.779	41.613	36.996	35.951	34.064	34.796	32.652	31.187	28.986	30.456	28.113	24.946	25.53
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	▄▃▁▂▂▅▇▇█▇▇▇▇▇▇▇▇█▇█▇▇▇▇█▇▇▇▇▇▇█	-134.331	-223.486	-326.652	-269.181	-268.961	-62.53	42.599	46.008	140.043	45.11	55.88	66.79	100.79	87.274	76.358	63.17	81.255	124.594	75.104	107.052	85.985	92.505	87.911	76.81	113.664	69.282	73.224	64.066	96.215	56.558	66.494	124.131	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:EnvironmentalRemediationContingency,us-gaap:UnusualOrInfrequentItem cnk:CoronavirusAidReliefAndEconomicSecurityAct,us-gaap:NaturalDisastersAndOtherCasualtyEvents		NA	NA	NA	-269.181	NA	NA	NA	46.008	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:IncomeTaxExpenseBenefit	▆▅▂▁▂▆▇▇▇▆▇▇▇▇▅▇▇█▆█▇▇▇▇█▇▇▇▇▇██▆▆▇▇▇▇▆▇▇▆▆▇▆▇	7.95	-14.643	-86.978	-121.145	-98.145	-3.108	15.76	14.053	38.182	11.917	35.837	16.169	18.326	25.097	-19.117	24.63	29.445	44.4	-2.183	40.926	31.617	33.459	29.676	30.109	42.774	26.38	25.587	25.534	24.081	20.862	50.59	43.386	8.722	10.618	37.169	29.453	30.844	27.932	11.404	29.337	23.272	9.037	11.92	15.877	10.211	19.83
us-gaap:IncomeTaxesPaidNet	▁▆▆▂▆▆▇▇▇▆▇▇▇▆▇▇█▆▇▇▇▆▇▇▇▆▇▇█▇██▇▇▇▇█▆▇▆▆▆▇	-134.451	-1.946	-8.14	-114.005	3.119	2.11	19.172	32.667	33.417	3.414	21.568	14.154	22.571	5.906	13.772	25.9	49.931	5.44	26.611	31.312	29.186	6.259	27.712	36.022	38.149	6.552	23.336	35.096	46.466	18.074	49.791	42.585	27.056	16.692	25.396	15.026	52.657	-4.045	13.204	11.679	-2.387	6.61	22.673	NA	NA	NA
us-gaap:InterestExpense	█▇█▇▃▁▁▁▁▁▂▂▃▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▄▆▅▄▄▅▅▅▅▄▄▃▃▃▂	37.034	36.553	37.587	36.577	28.372	24.666	24.904	24.967	24.929	25.141	27.269	27.144	28.466	27.115	26.71	26.317	26.522	26.369	26.333	26.659	27.262	28.059	27.811	28.419	28.304	28.207	28.597	28.335	28.286	28.48	28.172	29.478	34.458	32.606	29.296	30.861	31.375	32.133	31.786	32.249	29.777	29.29	28.891	28.938	28.605	26.01
us-gaap:NetIncomeLoss	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇██▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-142.467	-208.241	-239.256	-147.592	-170.389	-59.591	26.334	31.353	100.971	32.728	19.443	50.228	82.135	62.021	95.074	38.139	51.239	79.728	77.005	65.655	53.906	58.525	57.751	46.339	70.258	42.521	47.307	38.129	71.731	35.443	15.592	80.019	20.265	32.594	27.822	47.385	51.638	42.104	18.263	46.92	40.411	24.963	38.013	33.332	39.682	35.093
us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName cnk:Ncm		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest	▃▁▂▁▂▃▄▅▆▄▅▄▄▃▄▄▅▄▄▄▄▅▄▄▅▄▄▄▄▄▄▅▅▄▅▅▄▅▄▅▅▄▄▅▆█	0.186	-0.602	-0.418	-0.444	-0.427	0.169	0.505	0.602	0.89	0.465	0.6	0.393	0.329	0.156	0.401	0.401	0.571	0.466	0.282	0.471	0.462	0.521	0.484	0.362	0.632	0.381	0.33	0.403	0.403	0.253	0.312	0.726	0.572	0.468	0.616	0.582	0.501	0.772	0.34	0.728	0.598	0.359	0.297	0.551	1.077	1.618
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic	▃▂▁▃▂▄▆▆▇▆▆▆▇▇▇▆▇▇▇▇▇▇▇▆▇▆▆▆▇▆▆▇▆▆▆▆▇▆█▆▆▆▆▆▆	-139.754	-205.097	-237.809	-146.12	-169.06	-59.241	26.172	31.142	100.315	32.545	19.398	49.924	81.67	61.724	94.566	37.93	50.976	79.346	76.623	65.319	53.634	58.281	57.383	46.035	69.817	42.303	46.966	37.836	71.189	35.232	15.429	79.139	20.04	32.276	27.435	46.755	50.94	41.663	129.099	0.0	39.931	24.738	37.593	32.964	39.257	NA
us-gaap:NonoperatingIncomeExpense	▅▅▆▄▅▇▇█▇█▇▇▇▇██▇███▇▇█▇▇▇▇▇▇█▇█▁▇▇▇▆▇▆▇▆▇▇▇▆▇	-48.874	-54.048	-39.656	-58.397	-54.686	-19.611	-23.837	-12.523	-16.009	-12.258	-20.823	-15.948	-25.878	-14.968	-12.335	-11.005	-16.966	-6.599	-9.652	-10.738	-19.577	-22.322	-11.183	-22.317	-20.829	-21.156	-22.841	-18.218	-20.651	-11.297	-14.159	-11.061	-104.458	-21.949	-20.545	-16.733	-30.926	-18.68	-31.46	-24.325	-32.72	-14.397	-17.361	-24.028	-28.727	-15.252
us-gaap:OperatingIncomeLoss	▄▃▁▂▂▅▇▆█▆▇▇█▇▇▇▇█▇▇▇▇▇▇█▇▇▇▇▇▇██▇▇▇▇▇▇▇▇▆▇▇▇▇	-85.457	-169.438	-286.996	-210.784	-214.275	-42.919	66.436	58.531	156.052	57.368	76.703	82.738	126.668	102.242	88.693	74.175	98.221	131.193	84.756	117.79	105.562	114.827	99.094	99.127	134.493	90.438	96.065	82.284	116.866	67.855	80.653	135.192	134.017	65.629	86.152	94.153	113.909	89.488	61.467	101.31	97.001	48.756	67.591	73.788	79.697	71.793
us-gaap:OperatingIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName cnk:Ncm		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	61.868	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	█▁	8.259	-9.465	NA	-1.503	-3.702	-57.625	NA	-25.408	4.925	0.755	NA	-10.797	-56.248	0.204	NA	9.086	-18.401	13.342	-8.604	-3.669	24.887	13.78	-20.284	-59.181	0.628	-46.675	-29.876	-38.278	8.346	-9.189	1.06	-9.518	-40.827	1.586	-4.146	7.354	-39.239	15.799	-10.541	-59.119	16.03	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax	▇▆█▇▆▁▇▅▆▆▆▆▃▆▆▇▅▇▆▆█▇▅▂▆▃▅▄▇▆▆▆▄▇▆▇▄█▆▁▇	9.005	-3.761	17.712	5.025	-2.853	-81.796	9.269	-26.748	-0.999	-2.627	0.641	-10.86	-56.364	0.34	-10.388	9.074	-18.496	15.091	-8.332	-3.676	25.066	13.659	-19.413	-60.578	-2.193	-44.768	-27.4	-39.523	10.362	-6.407	1.836	-12.883	-36.874	3.718	-1.356	3.168	-37.801	21.746	-5.899	-75.43	10.342	NA	NA	NA	NA	NA
us-gaap:OtherNonoperatingIncomeExpense		NA	NA	-14.984	-22.881	-27.004	-0.169	-2.638	9.97	6.774	8.335	3.225	8.81	-0.836	7.273	9.947	13.168	7.03	12.982	12.303	14.54	7.59	10.38	11.588	1.501	8.4	-1.448	1.373	6.636	6.455	7.686	-42.646	12.795	-0.609	4.554	36.508	-9.455	-0.063	5.422	21.883	-2.816	-0.443	5.03	3.726	-0.647	1.454	NA
us-gaap:ProfitLoss	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-142.281	-208.843	-239.674	-148.036	-170.816	-59.422	26.839	31.955	101.861	33.193	20.043	50.621	82.464	62.177	95.475	38.54	51.81	80.194	77.287	66.126	54.368	59.046	58.235	46.701	70.89	42.902	47.637	38.532	72.134	35.696	15.904	80.745	20.837	33.062	28.438	47.967	52.139	42.876	18.603	47.648	41.009	25.322	38.31	33.883	40.759	36.711
us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization cnk:DigitalCinemaImplementationPartners,us-gaap:OtherAffiliates	▇▅▁▂▁▄█▇█	20.056	3.901	-34.583	-30.554	-37.966	-11.14	26.497	22.362	28.475	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest	█▁	0.186	-0.602	NA	-0.444	-0.427	0.169	NA	0.602	0.89	0.465	NA	0.393	0.329	0.156	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:Parent	█▁	-142.467	-208.241	NA	-147.592	-170.389	-59.591	NA	31.353	100.971	32.728	NA	50.228	82.135	62.021	NA	NA	NA	NA	NA	NA	NA	NA	57.751	46.339	70.258	42.521	47.307	38.129	71.731	35.443	15.592	80.019	20.265	32.594	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings	█▁	-142.467	-208.241	NA	-147.592	-170.389	-59.591	NA	31.353	100.971	32.728	NA	50.228	82.135	62.021	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	▃▂▂▁▁▅▇▇█▆▇▆▇▇▆▆▆▇▆▇▆▆▆▆▇▆▆▆▆▅▆▇▆▅▅▆▆▅▅▆▆▄▅▅▅▅	294.652	114.361	98.242	35.478	8.974	543.616	788.803	821.817	957.756	714.723	798.476	754.235	889.053	779.971	749.994	710.748	751.195	779.61	700.918	768.574	744.404	704.869	707.223	700.056	799.932	645.398	659.944	646.903	717.863	602.28	651.933	757.566	725.622	547.773	611.534	633.573	649.606	578.818	535.871	640.013	620.593	483.136	524.909	560.235	539.369	516.631
us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName cnk:Ncm		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization cnk:DigitalCinemaImplementationPartners,us-gaap:OtherAffiliates	█▁	14.098	5.624	NA	1.084	0.023	32.51	NA	40.2	48.007	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:Assets	▆▆▇█▇▇████▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁	5212.818	5296.954	5562.922	5802.613	5690.115	5632.893	5828.017	5751.603	5902.248	5790.748	4481.838	4397.573	4455.238	4413.471	4470.893	4371.65	4354.525	4383.326	4306.633	4176.619	4215.693	4128.715	4126.497	4044.256	4164.07	4046.287	4151.98	4060.429	4116.472	4088.878	4144.163	4082.898	4111.617	3857.199	3863.226	3581.318	3542.36	3574.703	3522.408	3458.188	3503.509	3404.139	NA	NA	NA	NA
us-gaap:Liabilities us-gaap:ConsolidatedEntities srt:ParentCompany		NA	NA	380.834	NA	NA	NA	25.984	NA	NA	NA	21.082	NA	NA	NA	15.942	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LiabilitiesAndStockholdersEquity	▆▆▇█▇▇████▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▁	5212.818	5296.954	5562.922	5802.613	5690.115	5632.893	5828.017	5751.603	5902.248	5790.748	4481.838	4397.573	4455.238	4413.471	4470.893	4371.65	4354.525	4383.326	4306.633	4176.619	4215.693	4128.715	4126.497	4044.256	4164.07	4046.287	4151.98	4060.429	4116.472	4088.878	4144.163	4082.898	4111.617	3857.199	3863.226	3581.318	3542.36	3574.703	3522.408	3458.188	3503.509	3404.139	3421.478	NA	NA	NA
us-gaap:StockholdersEquity	▁▂▃▅▅▆████████▇▇▇▇▆▆▆▆▅▅▆▅▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄	387.158	513.589	787.973	1007.033	1086.921	1253.28	1435.814	1483.703	1515.279	1451.942	1443.738	1456.756	1451.432	1459.942	1393.795	1339.828	1323.536	1321.72	1261.818	1221.548	1188.473	1139.559	1099.708	1084.731	1124.489	1082.517	1112.8	1119.552	1146.983	1090.813	1093.422	1099.31	1062.08	1099.662	1084.065	1076.369	1046.854	1054.653	1012.877	1018.221	1068.008	1037.876	1021.547	983.394	948.456	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AssetsCurrent	▄▅▇█▅▂▃▃▃▂▂▁▃▂▃▂▃▄▄▃▄▄▄▃▄▃▅▄▄▄▄▃▃▆▆▃▃▃▃▂▃▂▂	719.681	754.807	892.747	984.009	744.739	587.667	634.99	594.768	662.551	544.506	559.03	485.394	628.187	591.74	657.57	590.331	618.409	707.868	676.317	626.92	699.185	685.907	715.151	631.117	714.281	628.821	741.01	667.838	704.048	680.334	729.599	600.46	641.713	820.745	845.161	633.426	627.246	619.31	627.118	583.574	634.083	536.466	577.053	NA	NA	NA
us-gaap:CashAndCashEquivalentsAtCarryingValue	▄▃▅█▄▃▃▃▃▂▂▁▃▃▃▃▃▄▄▃▄▄▄▃▄▄▅▄▄▄▅▃▃▆▇▄▃▃▃▃▄▂▂▂▂▂	595.884	512.828	655.338	825.706	571.755	479.399	488.313	482.772	511.392	425.194	426.222	366.796	504.712	474.046	522.547	469.446	504.179	584.318	561.235	527.111	583.6	583.892	588.539	502.914	576.289	532.845	638.869	546.665	578.141	562.703	599.929	479.779	515.474	724.303	742.664	540.759	524.282	528.566	521.408	511.395	550.904	463.308	464.997	430.467	435.77	433.229
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	▁▁█	7.3	7.3	13.847	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccountsReceivableNetCurrent	▂▁▁▁▁▃▆▅█▆▇▆▆▆▇▆▅▅▅▄▆▅▅▆▇▄▃	35.312	23.732	25.265	24.645	23.543	51.641	83.722	66.947	103.985	85.062	95.084	76.82	80.308	78.211	89.25	82.65	72.401	69.368	74.993	62.48	79.989	67.979	74.287	86.119	96.921	55.415	47.917	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:InventoryNet	▃▂▂▄▄▆█▆█▆▆▅▅▅▅▅▆▅▅▄▄▄▄▃▃▃▃▂▃▂▃▂▃▁▂▁▂▁▁▂▃▁▂	14.44	12.17	12.593	15.159	15.584	17.972	21.686	19.346	21.761	18.142	19.319	16.319	17.685	17.083	17.507	16.844	18.388	17.394	16.961	15.482	15.977	15.3	15.954	13.236	13.969	13.46	13.419	11.61	13.316	11.687	13.735	12.324	13.075	10.825	12.571	10.662	12.495	11.273	11.284	11.746	12.925	10.505	11.686	NA	NA	NA
us-gaap:OtherAssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName cnk:Ncm		NA	NA	142.566	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent	▇▇▇▇▄▂█▄▄▂▃▄▄▄▃▃▄▇▃▃▃▃▂▃▃▃▂▂▂▂▂▂▂▁▂▂▁▁▂▁	34.664	31.419	34.4	34.394	22.299	13.361	37.187	20.859	21.146	11.895	15.117	21.482	20.667	19.409	16.536	17.01	19.333	33.91	15.761	18.047	16.913	17.958	13.494	17.007	15.316	16.337	10.937	14.464	12.967	12.387	14.94	14.578	11.687	9.254	11.278	11.428	10.495	8.912	11.3	10.56	NA	NA	10.931	NA	NA	NA
us-gaap:Land		NA	NA	104.19	NA	NA	NA	105.035	NA	NA	NA	103.739	NA	NA	NA	104.207	NA	NA	NA	103.08	NA	NA	NA	95.479	NA	NA	NA	95.699	NA	NA	NA	95.411	NA	NA	NA	102.49	NA	NA	NA	97.244	NA	NA	NA	91.678	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization cnk:DigitalCinemaImplementationPartners,us-gaap:OtherAffiliates	▁▁▁██	0.139	0.172	0.205	461.276	496.545	NA	581.547	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross	███▇▇▇█▇▇▇█████▇▇▇▆▆▅▅▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁	3387.203	3348.813	3403.103	3252.987	3256.215	3270.551	3348.237	3262.99	3261.831	3213.464	3404.15	3352.145	3362.779	3387.494	3328.589	3268.653	3192.491	3137.482	3059.754	2935.199	2880.968	2758.309	2687.391	2612.286	2630.597	2562.729	2549.092	2501.782	2501.147	2447.876	2402.796	2476.99	2420.892	2321.703	2284.129	2211.968	2157.971	2165.748	2103.927	2125.357	2136.215	2080.882	2048.204	NA	NA	NA
us-gaap:LeaseholdImprovementsGross		NA	NA	1190.835	NA	NA	NA	1216.931	NA	NA	NA	1151.454	NA	NA	NA	1103.522	NA	NA	NA	1009.355	NA	NA	NA	873.032	NA	NA	NA	844.983	NA	NA	NA	786.624	NA	NA	NA	790.71	NA	NA	NA	704.882	NA	NA	NA	670.344	NA	NA	NA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	█▇▇▇▆▆▆▆▆▅▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▂▂▁▁	1894.639	1815.515	1788.041	1707.164	1653.494	1612.226	1612.99	1580.589	1545.184	1489.011	1571.017	1531.658	1545.042	1551.842	1500.535	1477.047	1435.505	1408.246	1355.218	1322.09	1290.188	1232.45	1182.322	1151.268	1146.208	1109.986	1098.28	1073.995	1055.521	1012.775	975.606	1059.967	1024.981	1017.064	979.171	949.049	915.276	908.778	865.077	916.603	917.994	874.086	832.758	NA	NA	NA
us-gaap:AmortizationOfIntangibleAssets	▃▃▇▇▇▇▇▇▇▇▅▃▄▅▇▁▁▁▁▂▂▂▂▂▃▃▃▃▂▄▅▆▅▅▆▆▆▆█▅▄▆▆▆█▇	0.682	0.665	1.157	1.182	1.199	1.251	1.274	1.279	1.269	1.215	0.916	0.716	0.823	0.881	1.253	0.429	0.357	0.381	0.414	0.534	0.542	0.49	0.547	0.567	0.593	0.601	0.593	0.58	0.573	0.772	0.929	1.05	0.958	0.962	1.065	1.084	1.103	1.029	1.365	0.989	0.839	1.107	1.127	1.116	1.366	1.262
us-gaap:PropertyPlantAndEquipmentNet	▄▅▆▅▅▆▇▆▇▇██████▇▇▇▆▅▅▄▄▄▄▄▃▄▄▃▃▃▂▂▂▁▂▁▁▁▁▁	1492.564	1533.298	1615.062	1545.823	1602.721	1658.325	1735.247	1682.401	1716.647	1724.453	1833.133	1820.487	1817.737	1835.652	1828.054	1791.606	1756.986	1729.236	1704.536	1613.109	1590.78	1525.859	1505.069	1461.018	1484.389	1452.743	1450.812	1427.787	1445.626	1435.101	1427.19	1417.023	1395.911	1304.639	1304.958	1262.919	1242.695	1256.97	1238.85	1208.754	1218.221	1206.796	1215.446	NA	NA	NA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	▁▁▁▆▆▇▇████▇▇▆▆▅▅▅▅▅▄▄▅▄▄▄▄▃	23.629	23.932	23.726	118.589	131.13	151.232	155.285	166.033	164.176	157.458	156.766	153.101	145.081	118.789	120.045	112.878	106.345	100.19	98.317	100.621	93.099	87.031	94.973	89.059	87.731	84.094	77.658	74.007	NA	NA	59.657	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:Goodwill	▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▆▆▆▆▆▆▆██▂▂▂▂▂▂▂▁▁▁	1255.15	1249.195	1253.84	1249.427	1266.937	1268.559	1283.371	1281.354	1286.549	1276.753	1276.324	1276.8	1281.17	1283.945	1284.079	1294.342	1292.927	1265.753	1262.963	1262.445	1263.126	1258.686	1247.548	1252.29	1266.155	1265.425	1277.383	1277.334	1286.689	1284.665	1288.09	1328.842	1342.682	1151.495	1150.811	1152.892	1151.179	1164.591	1150.637	1154.225	1131.003	1125.482	1122.971	NA	NA	NA
us-gaap:IntangibleAssetsNetExcludingGoodwill	▁▁▁▁▁▂▂▂▂▂▃▃▃▄▄▄▄▃▄▄▄▄▄▄▅▅▅▅▆▆▆██▃▃▃▃▄▄▅▃▃▃	312.986	313.085	314.195	315.569	317.115	318.657	321.769	322.671	324.189	324.952	330.91	330.938	332.506	335.164	336.761	335.657	335.011	333.844	334.899	336.207	337.642	338.491	339.644	341.764	343.954	345.899	348.024	350.026	352.051	353.41	356.144	368.972	371.512	329.714	330.741	332.891	333.773	336.425	336.907	342.834	327.382	328.491	329.204	NA	NA	NA
us-gaap:FiniteLivedIntangibleAssetsNet	▁▁▁▁▂▂▂▂▃▃▄▄▄▄▄▄▄▄▄▄▅▅▅▅▅▆▆▆▆▇▇██▂▂▂▃▃▃▄▁	12.807	13.064	14.016	15.496	16.98	18.044	21.083	22.125	23.787	24.7	30.653	30.773	32.449	35.406	37.026	35.867	35.282	34.013	35.19	36.481	37.877	38.943	40.262	42.349	44.05	46.012	47.69	49.372	51.045	52.52	55.32	59.327	61.731	19.154	20.567	22.663	23.945	25.808	27.068	32.732	15.62	NA	18.134	NA	NA	NA
us-gaap:OperatingLeaseRightOfUseAsset	▇▇▇▇▇▇████▁	1229.587	1246.115	1278.191	1286.224	1315.482	1338.069	1383.08	1384.019	1429.451	1443.451	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▁▁▁▁▂▁▂▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▅▅▅▄▅▄▅▆██▇▆▄▃▃▃▄▄▅▄	31.592	31.064	33.199	36.047	38.229	36.162	39.114	39.102	41.066	38.91	41.055	47.386	47.488	41.623	39.767	40.391	40.992	39.542	37.555	42.324	41.241	41.955	38.243	82.345	82.625	80.895	77.99	80.381	75.328	87.607	104.3	127.517	121.738	106.902	102.044	76.784	63.839	63.297	63.98	72.017	78.259	85.737	70.978	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	▇▅▅▆▅▅█▆█▆▇▅▆▄▇▅▅▆▆▄▆▅▆▄▅▃▆▃▃▃▅▃▄▃▃▂▂▂▃▂▂▁▂	404.905	354.751	357.753	383.306	359.178	346.783	450.726	388.623	439.066	390.585	426.888	348.062	394.679	329.723	418.921	341.132	361.239	369.661	401.259	304.095	381.078	339.873	396.121	307.673	368.476	300.875	375.811	282.416	293.005	293.195	348.965	283.01	333.681	276.568	293.803	252.562	262.733	251.279	276.737	240.015	246.481	220.793	251.808	NA	NA	NA
us-gaap:AccountsPayableCurrent		NA	NA	70.646	NA	NA	NA	91.607	NA	NA	NA	104.638	NA	NA	NA	109.984	NA	NA	NA	110.172	NA	NA	NA	108.844	NA	NA	NA	119.172	NA	NA	NA	93.697	NA	NA	NA	70.833	NA	NA	NA	65.861	NA	NA	NA	64.132	NA	NA	NA
us-gaap:AccruedIncomeTaxesCurrent		NA	0.055	5.632	NA	0.51	3.969	5.195	12.656	22.627	31.855	12.179	8.708	6.85	11.058	5.509	7.893	3.766	30.238	5.071	9.244	12.37	12.691	7.332	8.582	15.896	17.963	6.396	12.527	24.261	35.444	22.081	19.079	23.701	19.045	8.891	7.169	5.467	22.549	6.506	1.368	NA	NA	0.0	NA	NA	NA
us-gaap:LiabilitiesCurrent	▇▆▆▇▆▆█▇█▇▅▃▄▃▄▃▃▄▄▃▄▃▄▃▄▃▄▂▃▃▃▂▃▂▂▂▂▂▂▁▁▁▁	651.722	594.51	606.441	623.877	596.119	600.427	708.8	639.779	700.195	656.978	474.689	391.356	439.834	387.349	468.913	392.674	405.886	439.518	443.225	347.209	426.337	389.894	439.793	351.537	419.143	351.626	414.407	319.045	341.834	353.338	395.712	325.276	385.509	321.726	338.204	282.061	290.264	295.81	305.027	261.377	264.03	239.662	271.94	NA	NA	NA
us-gaap:LongTermDebtCurrent	█▇▇▃▃▂▂▃▃▃▃▃▃▃▃▃▃▃▂▂▁▃▃▃▃▃▃▃▃▃▄▃▃▃▄▅▅▅▅▄▃▄▄	20.91	18.468	18.056	7.965	7.349	6.595	6.595	7.984	7.984	7.984	7.984	7.984	7.984	7.984	7.099	7.099	7.099	7.099	5.671	4.244	2.816	8.397	8.405	8.412	8.423	8.423	8.423	8.389	8.389	9.124	9.856	9.014	8.151	8.824	9.546	11.878	12.006	12.099	12.145	11.467	9.244	10.836	10.836	NA	NA	NA
us-gaap:OperatingLeaseLiabilityCurrent	██████████▁	211.468	206.75	208.593	216.382	213.124	213.941	217.406	215.015	215.06	211.387	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent		NA	NA	217.465	NA	NA	NA	175.706	NA	NA	NA	148.842	NA	NA	NA	120.497	NA	NA	NA	110.833	NA	NA	NA	112.575	NA	NA	NA	132.857	NA	NA	NA	134.141	NA	NA	NA	89.175	NA	NA	NA	82.0	NA	NA	NA	74.314	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:ConsolidatedEntities srt:ParentCompany		NA	NA	38.338	NA	NA	NA	24.948	NA	NA	NA	20.165	NA	NA	NA	15.208	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:LiabilitiesNoncurrent	████▇▇▆▆▆▆▂▂▂▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▁	4163.358	4178.461	4157.512	4160.288	3995.216	3766.901	3670.895	3615.373	3674.334	3669.984	2551.032	2536.69	2551.594	2554.131	2596.292	2627.156	2613.218	2610.774	2590.448	2595.794	2589.29	2587.847	2575.891	2596.613	2609.39	2601.428	2614.444	2612.002	2618.217	2635.473	2646.034	2647.515	2652.368	2424.49	2430.038	2211.159	2193.96	2212.906	2193.742	2167.21	2160.388	2114.736	2116.386	NA	NA	NA
us-gaap:LongTermDebt	███▇▅▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁	2547.815	2538.135	2527.9	2412.891	2152.965	1898.478	1801.327	1804.364	1806.013	1807.662	1809.311	1812.349	1813.997	1815.646	1817.295	1820.112	1821.539	1822.966	1822.966	1824.355	1824.355	1837.814	1814.572	1817.718	1819.479	1821.238	1822.997	1826.083	1827.833	1830.318	1832.8	1826.764	1827.651	1761.784	1764.01	1563.47	1566.396	1569.329	1572.221	1574.437	1570.604	NA	1532.441	NA	NA	NA
us-gaap:LongTermDebtNoncurrent	██▇▇▅▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁	2478.626	2476.68	2377.162	2366.38	2117.286	1869.821	1771.342	1771.663	1771.984	1772.304	1772.627	1774.456	1774.782	1775.252	1780.381	1781.952	1782.104	1782.522	1782.441	1786.549	1786.576	1793.907	1772.93	1809.306	1811.056	1812.815	1814.574	1817.694	1819.444	1821.194	1822.944	1817.75	1819.5	1752.96	1754.464	1551.592	1554.39	1557.23	1560.076	1562.97	1561.36	1519.102	1521.605	NA	NA	NA
us-gaap:DeferredIncomeTaxLiabilitiesNet	▁▁▃▅██▇	45.178	39.309	79.525	103.906	152.319	157.918	141.836	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:MinorityInterest	▄▄▅▅▆▇██▇▆▇█▇▇▆▇▆▅▅▇▆▅▅▅▅▄▃▃▂▁▁▄▆▅▅▆▅▅▄▅▅▆▆▇▆	10.58	10.394	10.996	11.415	11.859	12.285	12.508	12.748	12.44	11.844	12.379	12.771	12.378	12.049	11.893	11.992	11.885	11.314	11.142	12.068	11.593	11.415	11.105	11.375	11.048	10.716	10.329	9.83	9.438	9.254	8.995	10.797	11.66	11.321	10.919	11.729	11.282	11.334	10.762	11.38	11.083	11.865	11.605	11.998	11.478	NA
us-gaap:OtherLiabilitiesNoncurrent	▄▅▇▅▅▆▃▃▂▁▄▃▃▃▂▃▃▃▃▃▃▃▅▆▆▆▆▆▇▇▇▇█▄▅▅▃▃▃▄▄▄▄	52.241	60.459	74.594	62.538	63.003	64.736	44.036	43.851	40.091	31.992	50.348	47.76	48.081	45.38	41.98	44.906	45.875	44.127	44.301	46.588	47.911	48.55	60.784	66.242	65.685	65.839	67.287	70.299	71.496	73.746	74.687	78.034	82.101	55.347	59.33	62.148	47.788	44.848	46.497	50.47	51.38	53.982	53.809	NA	NA	NA
us-gaap:OperatingLeaseLiabilityNoncurrent	▇▇▇▇▇▇████▁	1085.539	1107.544	1138.142	1137.822	1167.018	1186.416	1223.462	1230.152	1274.599	1284.317	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo		NA	NA	250.956	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree		NA	NA	225.84	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour		NA	NA	194.197	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive		NA	NA	166.131	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive		NA	NA	508.104	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:StockholdersEquity	▁▂▃▅▅▆████████▇▇▇▇▆▆▆▆▅▅▆▅▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄	387.158	513.589	787.973	1007.033	1086.921	1253.28	1435.814	1483.703	1515.279	1451.942	1443.738	1456.756	1451.432	1459.942	1393.795	1339.828	1323.536	1321.72	1261.818	1221.548	1188.473	1139.559	1099.708	1084.731	1124.489	1082.517	1112.8	1119.552	1146.983	1090.813	1093.422	1099.31	1062.08	1099.662	1084.065	1076.369	1046.854	1054.653	1012.877	1018.221	1068.008	1037.876	1021.547	983.394	948.456	NA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	▁▂▃▅▅▆████████▇▇▇▇▆▆▆▆▅▅▆▅▅▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄	397.738	523.983	798.969	1018.448	1098.78	1265.565	1448.322	1496.451	1527.719	1463.786	1456.117	1469.527	1463.81	1471.991	1405.688	1351.82	1335.421	1333.034	1272.96	1233.616	1200.066	1150.974	1110.813	1096.106	1135.537	1093.233	1123.129	1129.382	1156.421	1100.067	1102.417	1110.107	1073.74	1110.983	1094.984	1088.098	1058.136	1065.987	1023.639	1029.601	1079.091	1049.741	1033.152	995.392	959.934	NA
us-gaap:CommonStockValue	█▇▇▆▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁	0.125	0.124	0.124	0.123	0.122	0.122	0.122	0.122	0.122	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.119	0.119	0.119	0.119	0.118	0.118	0.118	0.118	0.118	0.118	0.118	0.118	0.117	NA	NA	NA
us-gaap:AdditionalPaidInCapitalCommonStock	▆▆██▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁	1182.54	1176.633	1245.569	1238.547	1178.471	1174.15	1170.039	1165.91	1162.07	1158.394	1155.424	1151.452	1147.966	1144.514	1141.088	1137.897	1134.886	1131.683	1128.442	1125.263	1122.664	1120.061	1113.219	1107.307	1103.758	1100.782	1095.04	1092.548	1089.565	1086.456	1079.304	1073.33	1074.35	1070.923	1064.016	1058.266	1055.013	1051.914	1047.237	1044.67	1042.11	1040.856	1037.586	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit	▁▂▃▅▆▇███████▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃	-317.329	-174.866	27.937	267.193	414.785	585.174	687.332	748.558	757.226	696.267	686.459	704.608	691.91	647.298	582.222	521.058	516.83	499.494	453.679	408.241	374.059	351.611	324.632	296.157	278.898	237.716	224.219	205.99	196.892	154.191	147.764	161.324	110.296	114.38	106.111	102.854	79.749	52.386	34.423	40.317	17.555	1.294	0.388	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities srt:ParentCompany		NA	NA	27.937	NA	NA	NA	687.332	NA	NA	NA	686.459	NA	NA	NA	582.222	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	▁▁▁▁▁▁▂▂▂▂▃▃▃▃▃▄▄▄▄▄▄▃▃▃▄▄▅▅▆▆▆▆▆▇▇▇▇▇▇▇███	-391.162	-401.29	-398.653	-414.398	-422.092	-421.908	-340.112	-349.381	-322.633	-321.634	-319.007	-320.166	-309.306	-252.942	-253.282	-242.894	-251.969	-233.473	-247.013	-238.672	-234.992	-260.047	-271.686	-252.276	-191.732	-189.546	-144.772	-117.384	-77.872	-88.232	-81.819	-83.517	-70.739	-34.024	-37.698	-36.387	-39.544	-1.846	-23.682	-21.665	53.444	40.827	28.181	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities srt:ParentCompany		NA	NA	-398.653	NA	NA	NA	-340.112	NA	NA	NA	-319.007	NA	NA	NA	-253.282	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:TreasuryStockValue	██████▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁▁	87.016	87.012	87.004	84.432	84.365	84.258	81.567	81.506	81.506	81.206	79.259	79.259	79.259	79.049	76.354	76.354	76.332	76.105	73.411	73.405	73.379	72.187	66.577	66.577	66.555	66.555	61.807	61.722	61.722	61.722	51.946	51.946	51.946	51.736	48.482	48.482	48.482	47.919	45.219	45.219	45.219	45.219	44.725	NA	NA	NA
us-gaap:MinorityInterest	▄▄▅▅▆▇██▇▆▇█▇▇▆▇▆▅▅▇▆▅▅▅▅▄▃▃▂▁▁▄▆▅▅▆▅▅▄▅▅▆▆▇▆	10.58	10.394	10.996	11.415	11.859	12.285	12.508	12.748	12.44	11.844	12.379	12.771	12.378	12.049	11.893	11.992	11.885	11.314	11.142	12.068	11.593	11.415	11.105	11.375	11.048	10.716	10.329	9.83	9.438	9.254	8.995	10.797	11.66	11.321	10.919	11.729	11.282	11.334	10.762	11.38	11.083	11.865	11.605	11.998	11.478	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▁	5.908	4.668	NA	4.428	4.321	4.111	NA	3.84	3.677	2.97	3.972	3.486	3.452	3.426	3.194	3.043	3.203	3.241	3.147	2.587	2.542	5.118	5.908	3.375	2.977	3.498	3.254	2.975	3.066	3.523	6.54	3.558	3.338	3.45	4.905	3.297	3.553	3.315	2.56	2.56	2.559	2.013	3.173	1.925	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▆▂▁▄▁▄▇▆█▆█▅█▆█▅	102.662	-124.079	-162.445	-13.783	-138.309	-15.561	164.78	93.636	199.295	104.284	206.861	70.151	196.251	83.652	217.347	75.961	NA	NA	NA	NA	NA	NA	NA	NA	NA	25.114	231.485	63.402	97.87	61.877	131.173	65.01	70.896	42.587	121.03	98.799	77.636	97.74	98.629	109.914	121.616	61.042	110.876	45.737	64.037	44.101
us-gaap:NetCashProvidedByUsedInInvestingActivities	█████▇▃▅▅▆▄▁▃▅▃▅	-13.165	-17.659	-15.91	-20.645	-12.673	-34.138	-114.337	-71.119	-67.674	-57.512	-98.841	-161.1	-112.507	-78.922	-120.384	-80.518	NA	NA	NA	NA	NA	NA	NA	NA	NA	-86.723	-97.219	-53.208	-49.211	-53.701	29.234	-59.514	-303.226	-31.195	-73.066	-53.839	-46.072	-61.334	-57.789	-107.454	-45.968	-35.856	-50.295	-30.316	-35.786	-19.67
us-gaap:NetCashProvidedByUsedInFinancingActivities	▂▂▂█▇▃▁▁▁▁▁▁▁▁▁▁	-7.755	0.848	6.904	286.845	242.691	47.968	-47.442	-45.474	-45.68	-47.91	-48.104	-45.434	-45.664	-53.446	-43.609	-31.302	NA	NA	NA	NA	NA	NA	NA	NA	NA	-37.098	-36.823	-34.135	-34.438	-41.437	-37.486	-38.965	29.348	-29.081	154.889	-29.679	-29.568	-32.218	-29.414	-28.263	7.921	-28.658	-27.32	-25.583	-24.968	-28.779
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	▅▁▁█▅▄▄▃▅▄▅	83.056	-142.51	-170.368	253.951	92.356	-8.914	5.541	-28.62	86.198	-1.028	59.426	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AmortizationOfFinancingCosts	██▇▅▃▂▂▂▂▂▂▂▂▃▃▃▃▃▂▂▂▂▁▁▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁	2.683	2.59	2.39	2.025	1.589	1.328	1.328	1.328	1.327	1.328	1.325	1.323	1.323	1.59	1.578	1.556	1.534	1.529	1.424	1.404	1.378	1.286	1.275	1.276	1.288	1.312	1.311	1.311	1.312	1.311	1.311	1.309	1.47	1.386	1.217	1.189	1.189	1.197	1.187	1.186	1.187	1.184	1.183	1.176	1.176	1.181
us-gaap:DeferredIncomeTaxExpenseBenefit	▆▃▄▁▄▇▆▄▇▄▇▅▆▅▂▅▆▆▂▇▆▅█▅▆▃█▅▅▃▅▆▂▃▅▇▅▅▇▆▇▅▆▅▅▄	4.351	-18.07	-8.959	-33.321	-11.984	15.364	3.471	-11.154	16.804	-10.964	14.091	1.427	7.741	-0.072	-24.556	-4.974	5.626	8.889	-21.849	14.281	5.034	-2.933	20.665	-1.628	6.407	-14.349	21.502	1.027	-5.567	-16.436	-3.703	8.994	-23.916	-19.165	-1.655	10.928	-1.635	-2.358	11.14	4.655	10.651	-4.77	4.402	1.171	-3.648	-10.528
us-gaap:DepreciationDepletionAndAmortization	███▇▇▇▇█▇▇█▇▇▇▇▆▆▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▁▂▁▂▂▂▂▁▁▁	66.92	68.16	68.396	62.543	63.581	65.256	64.36	67.76	64.573	64.462	67.506	64.971	64.29	64.395	62.968	58.052	59.137	57.356	53.197	54.187	52.358	49.329	49.762	47.543	46.569	45.332	44.548	44.731	43.881	42.496	43.805	42.399	38.734	39.032	37.621	36.897	36.341	36.89	34.614	40.394	39.808	38.922	39.336	34.805	34.657	33.933
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet	▁█	-152.573	-14.193	NA	-65.815	54.307	66.29	NA	17.924	-5.201	-4.814	NA	46.828	-25.045	52.378	NA	21.498	33.871	0.064	NA	54.106	-18.951	40.947	NA	39.986	-24.688	51.705	NA	22.67	15.298	10.317	-68.791	65.094	-26.008	14.784	-46.158	3.935	10.528	-9.684	-13.828	-24.471	1.509	5.642	-27.796	137.016	-75.019	26.566
us-gaap:NetCashProvidedByUsedInOperatingActivities	▆▂▁▄▁▄▇▆█▆█▅█▆█▅	102.662	-124.079	-162.445	-13.783	-138.309	-15.561	164.78	93.636	199.295	104.284	206.861	70.151	196.251	83.652	217.347	75.961	NA	NA	NA	NA	NA	NA	NA	NA	NA	25.114	231.485	63.402	97.87	61.877	131.173	65.01	70.896	42.587	121.03	98.799	77.636	97.74	98.629	109.914	121.616	61.042	110.876	45.737	64.037	44.101
us-gaap:NetIncomeLoss	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇██▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-142.467	-208.241	-239.256	-147.592	-170.389	-59.591	26.334	31.353	100.971	32.728	19.443	50.228	82.135	62.021	95.074	38.139	51.239	79.728	77.005	65.655	53.906	58.525	57.751	46.339	70.258	42.521	47.307	38.129	71.731	35.443	15.592	80.019	20.265	32.594	27.822	47.385	51.638	42.104	18.263	46.92	40.411	24.963	38.013	33.332	39.682	35.093
us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName cnk:Ncm		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss	▃▂▁▃▂▅▆▇█▇▆▇█▇█▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▆█▆▇▆▇▇▇▆▇▇▆▇▇▇▇	-142.281	-208.843	-239.674	-148.036	-170.816	-59.422	26.839	31.955	101.861	33.193	20.043	50.621	82.464	62.177	95.475	38.54	51.81	80.194	77.287	66.126	54.368	59.046	58.235	46.701	70.89	42.902	47.637	38.532	72.134	35.696	15.904	80.745	20.837	33.062	28.438	47.967	52.139	42.876	18.603	47.648	41.009	25.322	38.31	33.883	40.759	36.711
us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization cnk:DigitalCinemaImplementationPartners,us-gaap:OtherAffiliates	▇▅▁▂▁▄█▇█	20.056	3.901	-34.583	-30.554	-37.966	-11.14	26.497	22.362	28.475	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest	█▁	0.186	-0.602	NA	-0.444	-0.427	0.169	NA	0.602	0.89	0.465	NA	0.393	0.329	0.156	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:Parent	█▁	-142.467	-208.241	NA	-147.592	-170.389	-59.591	NA	31.353	100.971	32.728	NA	50.228	82.135	62.021	NA	NA	NA	NA	NA	NA	NA	NA	57.751	46.339	70.258	42.521	47.307	38.129	71.731	35.443	15.592	80.019	20.265	32.594	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings	█▁	-142.467	-208.241	NA	-147.592	-170.389	-59.591	NA	31.353	100.971	32.728	NA	50.228	82.135	62.021	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ShareBasedCompensation	▇▅█▅▅▅▅▄▄▃▅▄▄▄▄▃▄▄▃▃▃▆▇▄▃▄▄▃▃▄█▄▄▄▆▄▄▄▃▃▃▂▃▂▂▁	5.907	4.668	6.545	4.427	4.321	4.111	4.129	3.84	3.676	2.97	3.972	3.486	3.452	3.426	3.194	3.043	3.203	3.241	3.147	2.587	2.542	5.118	5.908	3.375	2.977	3.498	3.254	2.975	3.066	3.523	6.54	3.558	3.338	3.45	4.905	3.297	3.553	3.315	2.56	2.56	2.559	2.013	3.173	1.925	1.941	1.313

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities	█████▇▃▅▅▆▄▁▃▅▃▅	-13.165	-17.659	-15.91	-20.645	-12.673	-34.138	-114.337	-71.119	-67.674	-57.512	-98.841	-161.1	-112.507	-78.922	-120.384	-80.518	NA	NA	NA	NA	NA	NA	NA	NA	NA	-86.723	-97.219	-53.208	-49.211	-53.701	29.234	-59.514	-303.226	-31.195	-73.066	-53.839	-46.072	-61.334	-57.789	-107.454	-45.968	-35.856	-50.295	-30.316	-35.786	-19.67
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment	▁▁▁▂▁▂█▅▄▄▇▆▆▅█▅▆▆▇▇▆▃▇▅▅▆▆▄▃▄▇▅▄▃▅▄▃▃▄▃▃▃▅▂▃▁	15.139	17.68	16.312	20.659	12.816	34.143	117.115	71.343	57.6	57.569	100.111	83.373	82.426	80.163	118.132	79.93	91.613	91.187	96.562	98.823	83.779	47.745	99.375	76.639	69.965	85.747	88.537	53.605	49.757	52.806	100.182	69.1	53.499	36.889	74.2	52.94	46.603	46.984	58.636	40.881	49.533	35.769	67.846	31.297	37.443	19.517

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities	▂▂▂█▇▃▁▁▁▁▁▁▁▁▁▁	-7.755	0.848	6.904	286.845	242.691	47.968	-47.442	-45.474	-45.68	-47.91	-48.104	-45.434	-45.664	-53.446	-43.609	-31.302	NA	NA	NA	NA	NA	NA	NA	NA	NA	-37.098	-36.823	-34.135	-34.438	-41.437	-37.486	-38.965	29.348	-29.081	154.889	-29.679	-29.568	-32.218	-29.414	-28.263	7.921	-28.658	-27.32	-25.583	-24.968	-28.779
us-gaap:RepaymentsOfLongTermDebt	▄▃▂▂▂▂█▂▂▂█▂▂▂▇▁	2.205	1.999	1.744	1.649	1.649	1.649	3.037	1.649	1.649	1.649	3.038	1.648	1.649	1.649	2.816	1.428	NA	NA	1.388	0.0	13.459	1.758	3.146	1.758	1.758	1.758	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PaymentsOfDividendsCommonStock		NA	NA	0.0	0.0	0.0	42.311	39.829	39.832	39.823	39.797	37.384	37.385	37.377	37.346	33.775	33.776	33.768	33.76	31.373	31.377	31.373	31.367	28.981	28.982	28.977	28.923	28.925	28.929	28.926	28.845	28.854	28.827	24.216	24.148	24.131	24.13	24.124	23.982	23.982	23.983	23.976	23.897	23.831	20.416	20.209	20.046

	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:DebtInstrumentInterestRateStatedPercentage	NA	NA	4.5e-06	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	4.875e-08	NA	NA	NA	5.125e-08	NA	NA	NA	7.375e-08	7.375e-08	NA	NA	NA	NA	NA	NA
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cnk:EightPointSevenFivePercentSeniorSecuredNoteDueTwentyTwentyFive	NA	NA	8.75e-06	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cnk:FourPointFiveZeroConvertibleSeniorNotes	NA	NA	NA	4.5e-06	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:StatementScenario,us-gaap:DebtInstrument srt:ScenarioForecast,cnk:FivePointOneTwoFivePercentSeniorNote	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:StatementScenario,us-gaap:DebtInstrument srt:ScenarioForecast,cnk:FourPointEightSevenFivePercentSeniorNotes	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

Common Stock Value

us-gaap:CommonStockValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	125000.0	124000.0	124000.0	123000.0	122000.0	122000.0	122000.0	122000.0	122000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	119000.0	119000.0	119000.0	119000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	117000.0
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	124000.0	122000.0	121000.0	121000.0
Percentage of CommonStockValue	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets srt:ParentCompany	0.0	0.0	0.0	0.0

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	123	121	121	121	120	120	119	119	118	117	117	114	108
Percentage of SharesIssued	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:TreasuryStock

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	-5.052	-4.712	-4.626	-4.526	-4.447	-4.184	-4.057	-3.695	-3.553	-3.392	-3.36	-3.305
Percentage of SharesIssued	-4.1	-3.9	-3.8	-3.7	-3.7	-3.5	-3.4	-3.1	-3.0	-2.9	-2.9	-2.9

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31	2010-09-30	2010-06-30	2010-03-31
Value	117	117	116	116	116	116	116	116	116	116	116	116	116	115	115	115	115	115	115	115	115	114	114	114	114	113	113	113	113	113	0.113209	0.112899	112	0.111552	0.11088
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31	2010-09-30	2010-06-30	2010-03-31
Value	117	117	116	116	116	116	116	116	116	116	115	115	115	115	115	115	115	115	115	114	114	114	114	114	114	113	113	113	112	112	0.112764	0.112542	112	111	0.110547
Percentage of WeightedAverageNumberOfSharesOutstandingBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-1.19	-1.75	-2.03	-1.25	-1.45	-0.51	0.22	0.27	0.86	0.28	0.17	0.43	0.7	0.53	0.82	0.33	0.44	0.68	0.66	0.56	0.46	0.5	0.5	0.4	0.61	0.37	0.41	0.33	0.62	0.31	0.13	0.69	0.18	0.28	0.24	0.41	0.45	0.37	0.16	0.41	0.35	0.22	0.33	0.29	0.35	0.32
Percentage of EarningsPerShareBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-1.19	-1.75	-2.03	-1.25	-1.45	-0.51	0.22	0.27	0.86	0.28	0.17	0.43	0.7	0.53	0.82	0.33	0.44	0.68	0.66	0.56	0.46	0.5	0.5	0.4	0.61	0.37	0.41	0.33	0.62	0.31	0.13	0.69	0.18	0.28	0.24	0.41	0.45	0.37	0.16	0.41	0.35	0.22	0.33	0.29	0.35	0.31
Percentage of EarningsPerShareDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	4.716	4.23	7.238	2.832	2.712	2.691	2.729	2.587	2.436	2.433	2.389	2.468	2.423	2.375	2.086	2.004	2.167	2.127	1.699	1.843	1.807	2.901	2.458	2.406	2.146	2.59	2.27	2.278	2.37	2.616	4.915	2.7	2.535	2.588	2.633	2.607	2.863	2.534
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.6	3.7	7.4	8.0	30.2	0.5	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.2	0.2	0.2	0.4	0.3	0.3	0.3	0.4	0.3	0.4	0.3	0.4	0.8	0.4	0.3	0.5	0.4	0.4	0.4	0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RestrictedStockUnitsRSU

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	1.191	0.438	-0.693	1.595	1.609	1.42	1.4	1.253	1.24	0.537	1.583	1.018	1.029	1.051	1.108	1.039	1.036	1.114	1.448	0.744	0.735	2.217	3.45	0.969	0.831	0.908	0.984	0.697	0.696	0.907	1.625	0.858	0.803	0.862
Percentage of AllocatedShareBasedCompensationExpense	25.3	10.4	-9.6	56.3	59.3	52.8	51.3	48.4	50.9	22.1	66.3	41.2	42.5	44.3	53.1	51.8	47.8	52.4	85.2	40.4	40.7	76.4	140.4	40.3	38.7	35.1	43.3	30.6	29.4	34.7	33.1	31.8	31.7	33.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.4	0.4	-0.7	4.5	17.9	0.3	0.2	0.2	0.1	0.1	0.2	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.1	0.1	0.3	0.5	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.1	0.1	0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStockUnitsRSU	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-133.462	-212.002	-221.544	-142.567	-173.242	-141.387	35	4.605	99	30	20	39	25	62	84	47	32	94	68	61	78	72	38	-14.204	68	-2.253	19	-1.383	82	29	17	67	-16.45	36	26	50	13	63	10	-28.189	50	37	52	54
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-45.3	-185.4	-225.5	-401.8	-1930.5	-26.0	4.5	0.6	10.4	4.2	2.5	5.2	2.9	8.0	11.3	6.6	4.4	12.2	9.8	8.1	10.6	10.2	5.4	-2.0	8.5	-0.3	3.0	-0.2	11.4	4.8	2.7	8.9	-2.3	6.6	4.3	8.0	2.1	11.0	2.0	-4.4	8.1	7.8	10.1	9.7

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	186000.0	-602000.0	-418000.0	-444000.0	-427000.0	169000.0	505000.0	602000.0	890000.0	465000.0	600000.0	393000.0	329000.0	156000.0	401000.0	401000.0	571000.0	466000.0	291000.0	475000.0	473000.0	530000.0	481000.0	327000.0	626000.0	387000.0	318000.0	392000.0	405000.0	259000.0	450000.0	621000.0	413000.0	512000.0	571000.0	593000.0	398000.0	682000.0	291000.0	407000.0	845000.0	260000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-0.5	-0.4	-1.3	-4.8	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.0	0.0	0.1	0.1	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.0	0.1	0.1	0.0	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	-133.276	-212.604	-221.962	-143.011	-173.669	-141.218	36	5.207	100	30	20	39	26	62	85	47	33	95	68	62	79	72	38	-13.877	68	-1.866	20	-0.991	82	29	17	67	-16.037	36	27	51	14	64	12	-27.782	51	37
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-45.2	-185.9	-225.9	-403.1	-1935.2	-26.0	4.6	0.6	10.5	4.3	2.6	5.3	2.9	8.0	11.3	6.7	4.4	12.2	9.8	8.1	10.7	10.3	5.5	-2.0	8.6	-0.3	3.1	-0.2	11.5	4.9	2.7	9.0	-2.2	6.7	4.4	8.1	2.2	11.2	2.4	-4.3	8.3	7.8

Costs And Expenses

us-gaap:CostsAndExpenses

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	380	283	385	246	223	586	722	763	801	657	721	671	762	677	661	636	652	648	616	650	638	590	608	600	665	554	563	564	600	534	571	622	591	482	525	539	535	489	474	538	523	434	457	486	459	444
Percentage of CostsAndExpenses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	129.0	248.2	392.1	694.1	2487.7	107.9	91.6	92.9	83.7	92.0	90.4	89.0	85.8	86.9	88.2	89.6	86.9	83.2	87.9	84.7	85.8	83.7	86.0	85.8	83.2	86.0	85.4	87.3	83.7	88.7	87.6	82.2	81.5	88.0	85.9	85.1	82.5	84.5	88.5	84.2	84.4	89.9	87.1	86.8	85.2	86.1

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Period End	2021-06-30	2021-03-31	2011-12-31	2011-09-30	2011-06-30
Value	-3924000.0	-2603000.0	0	0	-4945000.0
Percentage of GainsLossesOnExtinguishmentOfDebt	100.0	100.0	0.0	0.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-1.3	-2.3	0.0	0.0	-0.8

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument

cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-06-30	2021-03-31
Value	0	-2603000.0
Percentage of GainsLossesOnExtinguishmentOfDebt	-0.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	-2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:FivePointOneTwoFivePercentSeniorNote	0.0	0.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	37	35	28	30	28	41	46	44	44	37	41	38	43	42	40	36	37	38	34	35	35	37	40	39	39	37	36	35	39	39	44	42	40	37	41	36	35	34	34	32	31	28	30	28	24	25
Percentage of GeneralAndAdministrativeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	12.7	31.4	28.7	85.5	312.0	7.5	5.9	5.4	4.6	5.3	5.2	5.1	4.8	5.4	5.4	5.2	5.0	4.9	4.9	4.6	4.8	5.4	5.7	5.6	4.9	5.9	5.5	5.5	5.5	6.5	6.8	5.6	5.6	6.9	6.8	5.8	5.5	5.9	6.5	5.1	5.0	6.0	5.8	5.0	4.6	4.9

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30
Value	-134.331	-223.486	-326.652	-269.181	-268.961	-62.53	42	46	140	45	55	66	100	87	76	63	81	124	75	107	85	92	87	76	113	69	73	64	96	56	66	124
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-45.6	-195.4	-332.5	-758.7	-2997.1	-11.5	5.4	5.6	14.6	6.3	7.0	8.9	11.3	11.2	10.2	8.9	10.8	16.0	10.7	13.9	11.6	13.1	12.4	11.0	14.2	10.7	11.1	9.9	13.4	9.4	10.2	16.4

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:EnvironmentalRemediationContingency, us-gaap:UnusualOrInfrequentItem

cnk:CoronavirusAidReliefAndEconomicSecurityAct, us-gaap:NaturalDisastersAndOtherCasualtyEvents

Period End	2020-09-30	2019-09-30
Value	-269.181	46
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-758.7	5.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:CoronavirusAidReliefAndEconomicSecurityAct us-gaap:NaturalDisastersAndOtherCasualtyEvents	0.0	0.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	7.95	-14.643	-86.978	-121.145	-98.145	-3.108	15	14	38	11	35	16	18	25	-19.117	24	29	44	-2.183	40	31	33	29	30	42	26	25	25	24	20	50	43	8.722	10	37	29	30	27	11	29	23	9.037	11	15	10	19
Percentage of IncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.7	-12.8	-88.5	-341.5	-1093.7	-0.6	2.0	1.7	4.0	1.7	4.5	2.1	2.1	3.2	-2.5	3.5	3.9	5.7	-0.3	5.3	4.2	4.7	4.2	4.3	5.3	4.1	3.9	3.9	3.4	3.5	7.8	5.7	1.2	1.9	6.1	4.6	4.7	4.8	2.1	4.6	3.7	1.9	2.3	2.8	1.9	3.8

us-gaap:IncomeTaxExpenseBenefit us-gaap:EnvironmentalRemediationContingency, us-gaap:UnusualOrInfrequentItem

cnk:CoronavirusAidReliefAndEconomicSecurityAct, us-gaap:NaturalDisastersAndOtherCasualtyEvents

Period End	2020-09-30	2019-09-30
Value	-121.145	14
Percentage of IncomeTaxExpenseBenefit	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-341.5	1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:CoronavirusAidReliefAndEconomicSecurityAct us-gaap:NaturalDisastersAndOtherCasualtyEvents	0.0	0.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	-134.451	-1.946	-8.14	-114.005	3.119	2.11	19	32	33	3.414	21	14	22	5.906	13	25	49	5.44	26	31	29	6.259	27	36	38	6.552	23	35	46	18	49	42	27	16	25	15	52	-4.045	13	11	-2.387	6.61	22
Percentage of IncomeTaxesPaidNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-45.6	-1.7	-8.3	-321.3	34.8	0.4	2.4	4.0	3.5	0.5	2.7	1.9	2.5	0.8	1.8	3.6	6.6	0.7	3.8	4.1	3.9	0.9	3.9	5.1	4.8	1.0	3.5	5.4	6.5	3.0	7.6	5.6	3.7	3.0	4.2	2.4	8.1	-0.7	2.5	1.8	-0.4	1.4	4.3

Interest Expense

us-gaap:InterestExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	37	36	37	36	28	24	24	24	24	25	27	27	28	27	26	26	26	26	26	26	27	28	27	28	28	28	28	28	28	28	28	29	34	32	29	30	31	32	31	32	29	29	28	28	28	26
Percentage of InterestExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	12.6	32.0	38.3	103.1	316.2	4.5	3.2	3.0	2.6	3.5	3.4	3.6	3.2	3.5	3.6	3.7	3.5	3.4	3.8	3.5	3.7	4.0	3.9	4.1	3.5	4.4	4.3	4.4	3.9	4.7	4.3	3.9	4.7	6.0	4.8	4.9	4.8	5.6	5.9	5.0	4.8	6.1	5.5	5.2	5.3	5.0

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-142.467	-208.241	-239.256	-147.592	-170.389	-59.591	26	31	100	32	19	50	82	62	95	38	51	79	77	65	53	58	57	46	70	42	47	38	71	35	15	80	20	32	27	47	51	42	18	46	40	24	38	33	39	35
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-243.5	-416.0	-1898.7	-11.0	3.3	3.8	10.5	4.6	2.4	6.7	9.2	8.0	12.7	5.4	6.8	10.2	11.0	8.5	7.2	8.3	8.2	6.6	8.8	6.6	7.2	5.9	10.0	5.9	2.4	10.6	2.8	6.0	4.5	7.5	7.9	7.3	3.4	7.3	6.5	5.2	7.2	5.9	7.4	6.8

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27
Value	-46.867	-43.497	-34.95	-37.8	-8.6	25	23
Percentage of NetIncomeLoss	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	186000.0	-602000.0	-418000.0	-444000.0	-427000.0	169000.0	505000.0	602000.0	890000.0	465000.0	600000.0	393000.0	329000.0	156000.0	401000.0	401000.0	571000.0	466000.0	282000.0	471000.0	462000.0	521000.0	484000.0	362000.0	632000.0	381000.0	330000.0	403000.0	403000.0	253000.0	312000.0	726000.0	572000.0	468000.0	616000.0	582000.0	501000.0	772000.0	340000.0	728000.0	598000.0	359000.0	297000.0	551000.0	1077000.0	1618000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-0.5	-0.4	-1.3	-4.8	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.0	0.0	0.1	0.1	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.0	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.3

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	-139.754	-205.097	-237.809	-146.12	-169.06	-59.241	26	31	100	32	19	49	81	61	94	37	50	79	76	65	53	58	57	46	69	42	46	37	71	35	15	79	20	32	27	46	50	41	129	0.0	39	24	37	32	39
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-47.4	-179.3	-242.1	-411.9	-1883.9	-10.9	3.3	3.8	10.5	4.6	2.4	6.6	9.2	7.9	12.6	5.3	6.8	10.2	10.9	8.5	7.2	8.3	8.1	6.6	8.7	6.6	7.1	5.8	9.9	5.8	2.4	10.4	2.8	5.9	4.5	7.4	7.8	7.2	24.1	0.0	6.4	5.1	7.2	5.9	7.3

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-48874000.0	-54048000.0	-39656000.0	-58397000.0	-54686000.0	-19611000.0	-23837000.0	-12523000.0	-16009000.0	-12258000.0	-20823000.0	-15948000.0	-25878000.0	-14968000.0	-12335000.0	-11005000.0	-16966000.0	-6599000.0	-9652000.0	-10738000.0	-19577000.0	-22322000.0	-11183000.0	-22317000.0	-20829000.0	-21156000.0	-22841000.0	-18218000.0	-20651000.0	-11297000.0	-14159000.0	-11061000.0	-104460000.0	-21949000.0	-20545000.0	-16733000.0	-30926000.0	-18680000.0	-31460000.0	-24325000.0	-32720000.0	-14397000.0	-17361000.0	-24028000.0	-28727000.0	-15252000.0
Percentage of NonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-16.6	-47.3	-40.4	-164.6	-609.4	-3.6	-3.0	-1.5	-1.7	-1.7	-2.6	-2.1	-2.9	-1.9	-1.6	-1.5	-2.3	-0.8	-1.4	-1.4	-2.6	-3.2	-1.6	-3.2	-2.6	-3.3	-3.5	-2.8	-2.9	-1.9	-2.2	-1.5	-14.4	-4.0	-3.4	-2.6	-4.8	-3.2	-5.9	-3.8	-5.3	-3.0	-3.3	-4.3	-5.3	-3.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-85.457	-169.438	-286.996	-210.784	-214.275	-42.919	66	58	156	57	76	82	126	102	88	74	98	131	84	117	105	114	99	99	134	90	96	82	116	67	80	135	134	65	86	94	113	89	61	101	97	48	67	73	79	71
Percentage of OperatingIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-29.0	-148.2	-292.1	-594.1	-2387.7	-7.9	8.4	7.1	16.3	8.0	9.6	11.0	14.2	13.1	11.8	10.4	13.1	16.8	12.1	15.3	14.2	16.3	14.0	14.2	16.8	14.0	14.6	12.7	16.3	11.3	12.4	17.8	18.5	12.0	14.1	14.9	17.5	15.5	11.5	15.8	15.6	10.1	12.9	13.2	14.8	13.9

us-gaap:OperatingIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27	2015-07-02	2015-04-02	2014-12-31	2014-09-25	2014-06-26	2014-03-27	2013-09-26	2013-06-27	2013-03-28
Value	-29.699	-28.239	-20.073	-23.8	4.9	39	37	16	14	61	42	42	12	67	57	21
Percentage of OperatingIncomeLoss	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	64.4	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30
Value	8.259	-9.465	-1.503	-3.702	-57.625	-25.408	4.925	0.755	-10.797	-56.248	0.204	9.086	-18.401	13	-8.604	-3.669	24	13	-20.284	-59.181	0.628	-46.675	-29.876	-38.278	8.346	-9.189	1.06	-9.518	-40.827	1.586	-4.146	7.354	-39.239	15	-10.541	-59.119	16
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.8	-8.3	-4.2	-41.3	-10.6	-3.1	0.5	0.1	-1.4	-6.3	0.0	1.3	-2.4	1.7	-1.2	-0.5	3.3	2.0	-2.9	-8.5	0.1	-7.2	-4.5	-5.9	1.2	-1.5	0.2	-1.3	-5.6	0.3	-0.7	1.2	-6.0	2.7	-2.0	-9.2	2.6

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	8.259	-9.465	-1.503	-3.702	-57.625	-25.408	4.925	0.755	-10.797	-56.248	0.204
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.8	-8.3	-4.2	-41.3	-10.6	-3.1	0.5	0.1	-1.4	-6.3	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2012-09-30	2011-09-30
Value	8.259	-9.465	-1.503	-3.702	-57.625	-25.408	4.925	0.755	-10.797	-56.248	0.204	9.086	-18.401	13	-3.673	24	13	-59.146	0.634	-46.681	-38.267	8.344	-9.195	7.343	-58.798
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.1	100.0	99.9	99.9	101.0	100.0	100.0	100.0	100.1	99.9	99.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.8	-8.3	-4.2	-41.3	-10.6	-3.1	0.5	0.1	-1.4	-6.3	0.0	1.3	-2.4	1.7	-0.5	3.3	2.0	-8.4	0.1	-7.2	-5.9	1.2	-1.5	1.2	-9.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30
Value	9.005	-3.761	17	5.025	-2.853	-81.796	9.269	-26.748	-0.999	-2.627	0.641	-10.86	-56.364	0.34	-10.388	9.074	-18.496	15	-8.332	-3.676	25	13	-19.413	-60.578	-2.193	-44.768	-27.4	-39.523	10	-6.407	1.836	-12.883	-36.874	3.718	-1.356	3.168	-37.801	21	-5.899	-75.43	10
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.1	-3.3	18.0	14.2	-31.8	-15.0	1.2	-3.3	-0.1	-0.4	0.1	-1.4	-6.3	0.0	-1.4	1.3	-2.5	1.9	-1.2	-0.5	3.4	1.9	-2.7	-8.7	-0.3	-6.9	-4.2	-6.1	1.4	-1.1	0.3	-1.7	-5.1	0.7	-0.2	0.5	-5.8	3.8	-1.1	-11.8	1.7

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	-14.984	-22.881	-27.004	-0.169	-2.638	9.97	6.774	8.335	3.225	8.81	-0.836	7.273	9.947	13	7.03	12	12	14	7.59	10	11	1.501	8.4	-1.448	1.373	6.636	6.455	7.686	-42.646	12	-0.609	4.554	36	-9.455	-0.063	5.422	21	-2.816	-0.443	5.03	3.726	-0.647	1.454
Percentage of OtherNonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-15.3	-64.5	-300.9	-0.0	-0.3	1.2	0.7	1.2	0.4	1.2	-0.1	0.9	1.3	1.9	0.9	1.7	1.8	1.9	1.0	1.5	1.6	0.2	1.1	-0.2	0.2	1.0	0.9	1.3	-6.5	1.7	-0.1	0.8	6.0	-1.5	-0.0	0.9	4.1	-0.4	-0.1	1.0	0.7	-0.1	0.3

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-142.281	-208.843	-239.674	-148.036	-170.816	-59.422	26	31	101	33	20	50	82	62	95	38	51	80	77	66	54	59	58	46	70	42	47	38	72	35	15	80	20	33	28	47	52	42	18	47	41	25	38	33	40	36
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.3	-182.6	-244.0	-417.3	-1903.5	-10.9	3.4	3.9	10.6	4.6	2.5	6.7	9.3	8.0	12.7	5.4	6.9	10.3	11.0	8.6	7.3	8.4	8.2	6.7	8.9	6.6	7.2	6.0	10.0	5.9	2.4	10.7	2.9	6.0	4.7	7.6	8.0	7.4	3.5	7.4	6.6	5.2	7.3	6.0	7.6	7.1

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	20	3.901	-34.583	-30.554	-37.966	-11.14	26	22	28
Percentage of ProfitLoss	-14.1	-1.9	14.4	20.6	22.2	18.7	98.7	70.0	28.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.8	3.4	-35.2	-86.1	-423.1	-2.0	3.4	2.7	3.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	0.186	-0.602	-0.444	-0.427	0.169	0.602	0.89	0.465	0.393	0.329	0.156
Percentage of ProfitLoss	-0.1	0.3	0.3	0.2	-0.3	1.9	0.9	1.4	0.8	0.4	0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-0.5	-1.3	-4.8	0.0	0.1	0.1	0.1	0.1	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	-142.467	-208.241	-147.592	-170.389	-59.591	31	100	32	50	82	62	57	46	70	42	47	38	71	35	15	80	20	32
Percentage of ProfitLoss	100.1	99.7	99.7	99.8	100.3	98.1	99.1	98.6	99.2	99.6	99.7	99.2	99.2	99.1	99.1	99.3	99.0	99.4	99.3	98.0	99.1	97.3	98.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-416.0	-1898.7	-11.0	3.8	10.5	4.6	6.7	9.2	8.0	8.2	6.6	8.8	6.6	7.2	5.9	10.0	5.9	2.4	10.6	2.8	6.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-142.467	-208.241	-147.592	-170.389	-59.591	31	100	32	50	82	62
Percentage of ProfitLoss	100.1	99.7	99.7	99.8	100.3	98.1	99.1	98.6	99.2	99.6	99.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-416.0	-1898.7	-11.0	3.8	10.5	4.6	6.7	9.2	8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	294	114	98	35	8.974	543	788	821	957	714	798	754	889	779	749	710	751	779	700	768	744	704	707	700	799	645	659	646	717	602	651	757	725	547	611	633	649	578	535	640	620	483	524	560	539	516
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

srt:GeographyEliminations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	-0.176	-0.178	-0.186	-0.23	0.0	-1.859	-2.585	-3.583	-4.193	-2.982	-2.79	-3.261	-3.409	-3.302	-3.049	-3.75	-3.66
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-0.2	-0.2	-0.6	0.0	-0.3	-0.3	-0.4	-0.4	-0.4	-0.3	-0.4	-0.4	-0.4	-0.4	-0.5	-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-0.2	-0.2	-0.6	0.0	-0.3	-0.3	-0.4	-0.4	-0.4	-0.3	-0.4	-0.4	-0.4	-0.4	-0.5	-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:GeographyEliminations	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IntersegmentElimination

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-0.176	-0.178	-0.186	-0.23	0.0	-1.859	-2.585	-3.583	-4.193	-2.982	-2.79	-3.261	-3.409	-3.302	-3.049	-3.75	-3.66	-3.667	-2.771	-3.818	-3.691	-3.221	-2.803	-3.771	-4.055	-3.23	-2.909	-3.379	-3.503	-2.832
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-0.2	-0.2	-0.6	0.0	-0.3	-0.3	-0.4	-0.4	-0.4	-0.3	-0.4	-0.4	-0.4	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-0.2	-0.2	-0.6	0.0	-0.3	-0.3	-0.4	-0.4	-0.4	-0.3	-0.4	-0.4	-0.4	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5	-0.4	-0.5	-0.5	-0.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	25	17	11	1.069	0.819	116	138	188	214	159	147	171	179	183	167	200	199	202	150	199	187	164	148	194	211	174	161	186	196	160
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.6	15.1	11.5	3.0	9.1	21.4	17.6	23.0	22.4	22.4	18.4	22.8	20.2	23.5	22.3	28.2	26.6	25.9	21.5	26.0	25.2	23.3	21.0	27.8	26.4	27.0	24.4	28.8	27.4	26.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.6	15.1	11.5	3.0	9.1	21.4	17.6	23.0	22.4	22.4	18.4	22.8	20.2	23.5	22.3	28.2	26.6	25.9	21.5	26.0	25.2	23.3	21.0	27.8	26.4	27.0	24.4	28.8	27.4	26.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	269	97	87	34	8.155	429	652	636	747	557	654	585	712	599	585	514	554	581	553	572	560	543	561	509	592	474	501	463	524	444
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	85.1	88.6	97.6	90.9	79.0	82.7	77.5	78.0	78.0	81.9	77.6	80.1	76.9	78.1	72.4	73.9	74.6	78.9	74.5	75.3	77.2	79.4	72.8	74.1	73.5	76.0	71.7	73.1	73.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	85.1	88.6	97.6	90.9	79.0	82.7	77.5	78.0	78.0	81.9	77.6	80.1	76.9	78.1	72.4	73.9	74.6	78.9	74.5	75.3	77.2	79.4	72.8	74.1	73.5	76.0	71.7	73.1	73.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementGeographical

srt:ReportableGeographicalComponents, cnk:OtherInternationalCountries

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	19	12	5.848	0.556	0.471	63	76	108	125	89	82	106	107	103	89	118	112
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.8	11.2	6.0	1.6	5.2	11.6	9.7	13.3	13.1	12.5	10.3	14.2	12.0	13.3	12.0	16.7	14.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.8	11.2	6.0	1.6	5.2	11.6	9.7	13.3	13.1	12.5	10.3	14.2	12.0	13.3	12.0	16.7	14.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ReportableGeographicalComponents cnk:OtherInternationalCountries	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

srt:ReportableGeographicalComponents, country:BR

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	5.463	4.438	5.492	0.513	0.348	52	61	79	89	70	64	65	72	80	77	81	87
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.9	3.9	5.6	1.4	3.9	9.7	7.8	9.7	9.4	9.9	8.1	8.6	8.2	10.3	10.3	11.5	11.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.9	3.9	5.6	1.4	3.9	9.7	7.8	9.7	9.4	9.9	8.1	8.6	8.2	10.3	10.3	11.5	11.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ReportableGeographicalComponents country:BR	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

srt:ReportableGeographicalComponents, country:US

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	269	97	87	34	8.155	429	652	636	747	557	654	585	712	599	585	514	554
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	85.1	88.6	97.6	90.9	79.0	82.7	77.5	78.0	78.0	81.9	77.6	80.1	76.9	78.1	72.4	73.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	85.1	88.6	97.6	90.9	79.0	82.7	77.5	78.0	78.0	81.9	77.6	80.1	76.9	78.1	72.4	73.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ReportableGeographicalComponents country:US	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cnk:AdmissionsRevenue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	153	56	49	14	0.037	292	434	454	521	395	445	427	508	452	443	425	449
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	52.1	49.1	50.0	42.0	0.4	53.8	55.1	55.3	54.4	55.3	55.7	56.7	57.2	58.0	59.1	59.8	59.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	52.1	49.1	50.0	42.0	0.4	53.8	55.1	55.3	54.4	55.3	55.7	56.7	57.2	58.0	59.1	59.8	59.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:AdmissionsRevenue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:OtherRevenue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	15	5.384	3.909	1.721	0.452	30	28	40	49	33	37	30	38	33
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.2	4.7	4.0	4.9	5.0	5.5	3.6	4.9	5.2	4.7	4.7	4.0	4.3	4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.2	4.7	4.0	4.9	5.0	5.5	3.6	4.9	5.2	4.7	4.7	4.0	4.3	4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:OtherRevenue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:OtherRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	31	18	17	11	8.813	60	79	77	91	67	75	62	74	65	45	38	38
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	10.6	16.4	18.0	32.3	98.2	11.2	10.1	9.5	9.5	9.5	9.5	8.3	8.4	8.4	6.0	5.4	5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	10.6	16.4	18.0	32.3	98.2	11.2	10.1	9.5	9.5	9.5	9.5	8.3	8.4	8.4	6.0	5.4	5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:OtherRevenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	15	13	13	9.74	8.361	30	51	37	41	34
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.4	11.7	14.0	27.5	93.2	5.6	6.5	4.6	4.3	4.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.4	11.7	14.0	27.5	93.2	5.6	6.5	4.6	4.3	4.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Admission

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	153	56	49	14	0.037	292	434	454	521	395	445	427	508	452
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	52.1	49.1	50.0	42.0	0.4	53.8	55.1	55.3	54.4	55.3	55.7	56.7	57.2	58.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	52.1	49.1	50.0	42.0	0.4	53.8	55.1	55.3	54.4	55.3	55.7	56.7	57.2	58.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Admission	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Concessions

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	109	39	31	9.116	0.124	190	275	289	345	251	277	264	305	261	261	247	262
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	37.3	34.5	32.0	25.7	1.4	35.0	34.9	35.2	36.1	35.2	34.8	35.0	34.3	33.6	34.8	34.8	34.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	37.3	34.5	32.0	25.7	1.4	35.0	34.9	35.2	36.1	35.2	34.8	35.0	34.3	33.6	34.8	34.8	34.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Concessions	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:TheatreServices, cnk:CNMKTexasPropertiesLLC, cnk:AWSRInvestmentsLimitedLiabilityCompany

Period End	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	0.016	0.003	0.01	0.01
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.1	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.1	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:TheatreServices cnk:CNMKTexasPropertiesLLC cnk:AWSRInvestmentsLimitedLiabilityCompany	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cnk:OtherRevenue, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	1.44	0.99	0.253	0.194	0.272	5.993	39	9.955	11	7.23	7.189	7.993	8.838	8.065
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	0.9	0.3	0.5	3.0	1.1	5.0	1.2	1.2	1.0	0.9	1.1	1.0	1.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	0.9	0.3	0.5	3.0	1.1	5.0	1.2	1.2	1.0	0.9	1.1	1.0	1.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:OtherRevenue cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:OtherRevenue, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	14	4.394	3.656	1.527	0.18	24	-11.147	30	38	26	30	22	29	25
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.8	3.8	3.7	4.3	2.0	4.4	-1.4	3.7	4.0	3.6	3.8	2.9	3.3	3.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.8	3.8	3.7	4.3	2.0	4.4	-1.4	3.7	4.0	3.6	3.8	2.9	3.3	3.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:OtherRevenue cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.582	2.201	2.895	0.513	0.478	12	-13.699	16	19	14
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.2	1.9	2.9	1.4	5.3	2.3	-1.7	2.0	2.0	2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.2	1.9	2.9	1.4	5.3	2.3	-1.7	2.0	2.0	2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	15	11	10	9.227	7.883	18	64	21	22	20
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.2	9.8	11.1	26.0	87.8	3.3	8.2	2.6	2.3	2.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.2	9.8	11.1	26.0	87.8	3.3	8.2	2.6	2.3	2.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:ScreenAdvertisingScreenRentalAndPromotionalRevenues cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Admission, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	12	7.634	4.629	0.107	0.0	60	69	103	114	86	75	94	100	103
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.4	6.7	4.7	0.3	0.0	11.1	8.8	12.6	11.9	12.1	9.4	12.5	11.2	13.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.4	6.7	4.7	0.3	0.0	11.1	8.8	12.6	11.9	12.1	9.4	12.5	11.2	13.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Admission cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Admission, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	140	48	44	14	0.037	232	364	351	406	308	369	333	408	349
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	47.7	42.4	45.3	41.7	0.4	42.7	46.3	42.7	42.5	43.2	46.3	44.2	46.0	44.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	47.7	42.4	45.3	41.7	0.4	42.7	46.3	42.7	42.5	43.2	46.3	44.2	46.0	44.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Admission cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Concessions, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	10	6.447	3.563	0.255	0.069	37	43	59	70	51	46	56	55	58
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	5.6	3.6	0.7	0.8	6.9	5.5	7.2	7.3	7.3	5.8	7.5	6.3	7.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	5.6	3.6	0.7	0.8	6.9	5.5	7.2	7.3	7.3	5.8	7.5	6.3	7.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Concessions cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Concessions, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	99	33	27	8.861	0.055	152	231	230	274	199	231	207	249	203
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	33.7	28.9	28.4	25.0	0.6	28.1	29.4	28.0	28.7	27.9	28.9	27.6	28.1	26.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	33.7	28.9	28.4	25.0	0.6	28.1	29.4	28.0	28.7	27.9	28.9	27.6	28.1	26.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Concessions cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	25	17	11	1.069	0.819	116	138	188	214	159	147	171	179	183
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.6	15.1	11.5	3.0	9.1	21.4	17.6	23.0	22.4	22.4	18.4	22.8	20.2	23.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.6	15.1	11.5	3.0	9.1	21.4	17.6	23.0	22.4	22.4	18.4	22.8	20.2	23.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:InternationalOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	269	97	86	34	8.155	427	650	633	742	554	651	582	709	596
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	84.9	88.5	97.0	90.9	78.6	82.4	77.0	77.6	77.6	81.6	77.2	79.8	76.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	91.4	84.9	88.5	97.0	90.9	78.6	82.4	77.0	77.6	77.6	81.6	77.2	79.8	76.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:UsOperatingSegment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService

cnk:InternationalOperatingSegment, us-gaap:TransferredAtPointInTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	23	14	8.316	0.352	0.077	101	117	169	192	143	125	155	161	166
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.1	12.5	8.5	1.0	0.9	18.6	14.8	20.6	20.1	20.0	15.7	20.6	18.1	21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	8.1	12.5	8.5	1.0	0.9	18.6	14.8	20.6	20.1	20.0	15.7	20.6	18.1	21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:InternationalOperatingSegment us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:InternationalOperatingSegment, us-gaap:TransferredOverTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	1.49	2.96	3.024	0.717	0.742	14	21	19	22	16	21	16	18	17
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	2.6	3.1	2.0	8.3	2.7	2.7	2.4	2.3	2.4	2.7	2.2	2.1	2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	2.6	3.1	2.0	8.3	2.7	2.7	2.4	2.3	2.4	2.7	2.2	2.1	2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:InternationalOperatingSegment us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:UsOperatingSegment, us-gaap:TransferredAtPointInTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	249	80	70	24	0.089	401	627	610	718	532	629	561	686	575
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	84.7	70.4	72.1	70.3	1.0	73.8	79.6	74.2	75.0	74.5	78.8	74.5	77.2	73.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	84.7	70.4	72.1	70.3	1.0	73.8	79.6	74.2	75.0	74.5	78.8	74.5	77.2	73.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:UsOperatingSegment us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:UsOperatingSegment, us-gaap:TransferredOverTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	19	16	16	9.464	8.066	26	22	22	24	22	22	20	22	20
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.7	14.5	16.3	26.7	89.9	4.8	2.8	2.8	2.5	3.2	2.8	2.7	2.5	2.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.7	14.5	16.3	26.7	89.9	4.8	2.8	2.8	2.5	3.2	2.8	2.7	2.5	2.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:UsOperatingSegment us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TimingOfTransferOfGoodOrService

us-gaap:TransferredAtPointInTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	273	94	79	25	0.166	502	744	779	911	675	754	717	847	741
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	92.8	82.9	80.6	71.3	1.8	92.5	94.4	94.8	95.1	94.5	94.5	95.1	95.4	95.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	92.8	82.9	80.6	71.3	1.8	92.5	94.4	94.8	95.1	94.5	94.5	95.1	95.4	95.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:TransferredOverTime

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	21	19	19	10	8.808	40	43	42	46	39	43	37	41	37
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.2	17.1	19.4	28.7	98.2	7.5	5.6	5.2	4.9	5.5	5.5	4.9	4.6	4.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.2	17.1	19.4	28.7	98.2	7.5	5.6	5.2	4.9	5.5	5.5	4.9	4.6	4.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Revenues

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:Revenues

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27
Value	13	5.445	6.0	4.0	64	110	110
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30
Value	14	5.624	1.084	0.023	32	40	48
Percentage of Revenues	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.8	4.9	3.1	0.3	6.0	4.9	5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Assets

us-gaap:Assets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-12-29	2011-09-30	2011-06-30	2011-03-31	2010-12-30
Value	5212	5296	5562	5802	5690	5632	5828	5751	5902	5790	4481	4397	4455	4413	4470	4371	4354	4383	4306	4176	4215	4128	4126	4044	4164	4046	4151	4060	4116	4088	4144	4082	4111	3857	3863	3581	3542	3574	3522	421	3458	3503	3404	425
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	1168	1461	1464	1409
Percentage of Assets	21.0	25.1	32.7	31.5
Percentage of Assets	21.0	25.1	32.7	31.5
Percentage of Assets srt:ParentCompany	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities us-gaap:ConsolidatedEntities

us-gaap:Liabilities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	380	25	21	15
Percentage of Liabilities	100.0	100.0	100.0	100.0
Percentage of Assets	6.8	0.4	0.5	0.4
Percentage of Assets srt:ParentCompany	32.6	1.8	1.4	1.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	5212	5296	5562	5802	5690	5632	5828	5751	5902	5790	4481	4397	4455	4413	4470	4371	4354	4383	4306	4176	4215	4128	4126	4044	4164	4046	4151	4060	4116	4088	4144	4082	4111	3857	3863	3581	3542	3574	3522	3458	3503	3404	3421
Percentage of LiabilitiesAndStockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	1168	1461	1464	1409
Percentage of LiabilitiesAndStockholdersEquity	21.0	25.1	32.7	31.5
Percentage of Assets	21.0	25.1	32.7	31.5
Percentage of Assets srt:ParentCompany	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2009-12-31
Value	387	513	787	1007	1086	1253	1435	1483	1515	1451	1443	1456	1451	1459	1393	1339	1323	1321	1261	1221	1188	1139	1099	1084	1124	1082	1112	1119	1146	1090	1093	1099	1062	1099	1084	1076	1046	1054	1012	1018	1068	1037	1021	983	948	899
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	7.4	9.7	14.2	17.4	19.1	22.2	24.6	25.8	25.7	25.1	32.2	33.1	32.6	33.1	31.2	30.6	30.4	30.2	29.3	29.2	28.2	27.6	26.6	26.8	27.0	26.8	26.8	27.6	27.9	26.7	26.4	26.9	25.8	28.5	28.1	30.1	29.6	29.5	28.8	29.4	30.5	30.5	29.9	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	787	1435	1443	1393
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0
Percentage of Assets	14.2	24.6	32.2	31.2
Percentage of Assets srt:ParentCompany	67.4	98.2	98.6	98.9

Assets Current

us-gaap:AssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	719	754	892	984	744	587	634	594	662	544	559	485	628	591	657	590	618	707	676	626	699	685	715	631	714	628	741	667	704	680	729	600	641	820	845	633	627	619	627	583	634	536	577
Percentage of AssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	13.8	14.2	16.0	17.0	13.1	10.4	10.9	10.3	11.2	9.4	12.5	11.0	14.1	13.4	14.7	13.5	14.2	16.1	15.7	15.0	16.6	16.6	17.3	15.6	17.2	15.5	17.8	16.4	17.1	16.6	17.6	14.7	15.6	21.3	21.9	17.7	17.7	17.3	17.8	16.9	18.1	15.8	16.9

us-gaap:AssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	39	29	36	28	22	51
Percentage of AssetsCurrent	5.5	4.0	4.1	2.9	3.0	8.1
Percentage of Assets	0.8	0.6	0.7	0.5	0.4	0.9
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31	2009-12-31	2008-12-31
Value	595	512	655	825	571	479	488	482	511	425	426	366	504	474	522	469	504	584	561	527	583	583	588	502	576	532	638	546	578	562	599	479	515	724	742	540	524	528	521	511	550	463	464	430	435	433	437	349
Percentage of CashAndCashEquivalentsAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	11.4	9.7	11.8	14.2	10.0	8.5	8.4	8.4	8.7	7.3	9.5	8.3	11.3	10.7	11.7	10.7	11.6	13.3	13.0	12.6	13.8	14.1	14.3	12.4	13.8	13.2	15.4	13.5	14.0	13.8	14.5	11.8	12.5	18.8	19.2	15.1	14.8	14.8	14.8	14.8	15.7	13.6	13.6	0.0	0.0	0.0	0.0	0.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	394	0.097	0.006	0.132
Percentage of CashAndCashEquivalentsAtCarryingValue	60.2	0.0	0.0	0.0
Percentage of Assets	7.1	0.0	0.0	0.0
Percentage of Assets srt:ParentCompany	33.8	0.0	0.0	0.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2021-06-30	2021-03-31	2020-12-31
Value	7.3	7.3	13
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.2

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	35	23	25	24	23	51	83	66	103	85	95	76	80	78	89	82	72	69	74	62	79	67	74	86	96	55	47
Percentage of AccountsReceivableNetCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.7	0.4	0.5	0.4	0.4	0.9	1.4	1.2	1.8	1.5	2.1	1.7	1.8	1.8	2.0	1.9	1.7	1.6	1.7	1.5	1.9	1.6	1.8	2.1	2.3	1.4	1.2

Inventory Net

us-gaap:InventoryNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	14	12	12	15	15	17	21	19	21	18	19	16	17	17	17	16	18	17	16	15	15	15	15	13	13	13	13	11	13	11	13	12	13	10	12	10	12	11	11	11	12	10	11
Percentage of InventoryNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.2	0.2	0.3	0.3	0.3	0.4	0.3	0.4	0.3	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.4	0.3	0.3	0.3	0.4	0.3	0.3

Other Assets Current

us-gaap:OtherAssetsCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:OtherAssetsCurrent

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	114	151	142	170	197	185
Percentage of OtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	2.6	0.0	0.0	0.0
Percentage of Assets cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2010-12-31
Value	34	31	34	34	22	13	37	20	21	11	15	21	20	19	16	17	19	33	15	18	16	17	13	17	15	16	10	14	12	12	14	14	11	9.254	11	11	10	8.912	11	10	10
Percentage of PrepaidExpenseAndOtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.7	0.6	0.6	0.6	0.4	0.2	0.6	0.4	0.4	0.2	0.3	0.5	0.5	0.4	0.4	0.4	0.4	0.8	0.4	0.4	0.4	0.4	0.3	0.4	0.4	0.4	0.3	0.4	0.3	0.3	0.4	0.4	0.3	0.2	0.3	0.3	0.3	0.2	0.3	0.3	0.3

us-gaap:PrepaidExpenseAndOtherAssetsCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2018-12-31
Value	0.008	0.011
Percentage of PrepaidExpenseAndOtherAssetsCurrent	0.0	0.1
Percentage of Assets	0.0	0.0
Percentage of Assets srt:ParentCompany	0.0	0.0

Land

us-gaap:Land

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	104	105	103	104	103	95	95	95	102	97	91
Percentage of Land	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.9	1.8	2.3	2.3	2.4	2.3	2.3	2.3	2.7	2.8	2.7

Assets Noncurrent

us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

us-gaap:AssetsNoncurrent

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	0.139	0.172	0.205	461	496	581
Percentage of AssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	7.9	8.7	10.0
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	3387	3348	3403	3252	3256	3270	3348	3262	3261	3213	3404	3352	3362	3387	3328	3268	3192	3137	3059	2935	2880	2758	2687	2612	2630	2562	2549	2501	2501	2447	2402	2476	2420	2321	2284	2211	2157	2165	2103	2125	2136	2080	2048
Percentage of PropertyPlantAndEquipmentGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	65.0	63.2	61.2	56.1	57.2	58.1	57.5	56.7	55.3	55.5	76.0	76.2	75.5	76.8	74.5	74.8	73.3	71.6	71.0	70.3	68.3	66.8	65.1	64.6	63.2	63.3	61.4	61.6	60.8	59.9	58.0	60.7	58.9	60.2	59.1	61.8	60.9	60.6	59.7	61.5	61.0	61.1	59.9

Leasehold Improvements Gross

us-gaap:LeaseholdImprovementsGross

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	1190	1216	1151	1103	1009	873	844	786	790	704	670
Percentage of LeaseholdImprovementsGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	21.4	20.9	25.7	24.7	23.4	21.2	20.4	19.0	20.5	20.0	19.6

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	1894	1815	1788	1707	1653	1612	1612	1580	1545	1489	1571	1531	1545	1551	1500	1477	1435	1408	1355	1322	1290	1232	1182	1151	1146	1109	1098	1073	1055	1012	975	1059	1024	1017	979	949	915	908	865	916	917	874	832
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	36.3	34.3	32.1	29.4	29.1	28.6	27.7	27.5	26.2	25.7	35.1	34.8	34.7	35.2	33.6	33.8	33.0	32.1	31.5	31.7	30.6	29.9	28.7	28.5	27.5	27.4	26.5	26.5	25.6	24.8	23.5	26.0	24.9	26.4	25.3	26.5	25.8	25.4	24.6	26.5	26.2	25.7	24.3

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

cnk:PropertyUnderFinanceLease

Period End	2020-12-31	2019-12-31
Value	47	36
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2.7	2.3
Percentage of Assets	0.9	0.6
Percentage of Assets cnk:PropertyUnderFinanceLease	0.0	0.0

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	682000.0	665000.0	1157000.0	1182000.0	1199000.0	1251000.0	1274000.0	1279000.0	1269000.0	1215000.0	916000.0	716000.0	823000.0	881000.0	1253000.0	429000.0	357000.0	381000.0	414000.0	534000.0	542000.0	490000.0	547000.0	567000.0	593000.0	601000.0	593000.0	580000.0	573000.0	772000.0	929000.0	1050000.0	958000.0	962000.0	1065000.0	1084000.0	1103000.0	1029000.0	1365000.0	989000.0	839000.0	1107000.0	1127000.0	1116000.0	1366000.0	1262000.0
Percentage of AmortizationOfIntangibleAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	1492	1533	1615	1545	1602	1658	1735	1682	1716	1724	1833	1820	1817	1835	1828	1791	1756	1729	1704	1613	1590	1525	1505	1461	1484	1452	1450	1427	1445	1435	1427	1417	1395	1304	1304	1262	1242	1256	1238	1208	1218	1206	1215
Percentage of PropertyPlantAndEquipmentNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	28.6	28.9	29.0	26.6	28.2	29.4	29.8	29.3	29.1	29.8	40.9	41.4	40.8	41.6	40.9	41.0	40.3	39.5	39.6	38.6	37.7	37.0	36.5	36.1	35.6	35.9	34.9	35.2	35.1	35.1	34.4	34.7	34.0	33.8	33.8	35.3	35.1	35.2	35.2	35.0	34.8	35.5	35.5

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidationItems, us-gaap:StatementGeographical

srt:ReportableGeographicalComponents, cnk:OtherInternationalCountries

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	136	140	150	149	156	163	180	163	166	167	212	206	205	209
Percentage of PropertyPlantAndEquipmentNet	9.1	9.2	9.3	9.7	9.8	9.8	10.4	9.7	9.7	9.7	11.6	11.3	11.3	11.4
Percentage of Assets	2.6	2.7	2.7	2.6	2.7	2.9	3.1	2.8	2.8	2.9	4.8	4.7	4.6	4.7
Percentage of Assets srt:ReportableGeographicalComponents cnk:OtherInternationalCountries	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

srt:ReportableGeographicalComponents, country:BR

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	69	64	72	71	78	86	118	111	121	122	140	139	146	179
Percentage of PropertyPlantAndEquipmentNet	4.7	4.2	4.5	4.6	4.9	5.2	6.8	6.6	7.1	7.1	7.7	7.7	8.1	9.8
Percentage of Assets	1.3	1.2	1.3	1.2	1.4	1.5	2.0	1.9	2.1	2.1	3.1	3.2	3.3	4.0
Percentage of Assets srt:ReportableGeographicalComponents country:BR	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

srt:ReportableGeographicalComponents, country:US

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	1286	1328	1392	1324	1367	1408	1436	1408	1429	1434	1479	1474	1465	1439
Percentage of PropertyPlantAndEquipmentNet	86.2	86.6	86.2	85.7	85.4	85.0	82.8	83.7	83.3	83.2	80.7	81.0	80.6	78.7
Percentage of Assets	24.7	25.1	25.0	22.8	24.0	25.0	24.6	24.5	24.2	24.8	33.0	33.5	32.9	32.2
Percentage of Assets srt:ReportableGeographicalComponents country:US	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2013-12-31
Value	23	23	23	118	131	151	155	166	164	157	156	153	145	118	120	112	106	100	98	100	93	87	94	89	87	84	77	74	59
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.5	0.5	0.4	2.0	2.3	2.7	2.7	2.9	2.8	2.7	3.5	3.5	3.3	2.7	2.7	2.6	2.4	2.3	2.3	2.4	2.2	2.1	2.3	2.2	2.1	2.1	1.9	1.8	1.4

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2014-12-31	2013-12-31	2012-12-31
Value	23	23	23	118	131	151	155	166	164	157	156	153	145	118	120	112	106	100	98	100	93	87	94	89	77	59	38
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	0.5	0.5	0.4	2.0	2.3	2.7	2.7	2.9	2.8	2.7	3.5	3.5	3.3	2.7	2.7	2.6	2.4	2.3	2.3	2.4	2.2	2.1	2.3	2.2	1.9	1.4	1.0
Percentage of Assets us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:ACJVLLC, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2016-12-31	2015-12-31
Value	2.807	3.292	3.745	4.404	5.065	5.762	5.022	5.651	6.416	6.944	5.266	6.564	6.324	5.916	5.98	7.269
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	11.9	13.8	15.8	3.7	3.9	3.8	3.2	3.4	3.9	4.4	3.4	4.3	4.4	4.9	6.1	7.7
Percentage of Assets	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2
Percentage of Assets cnk:ACJVLLC us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:DigitalCinemaDistributionCoalition, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2016-12-31	2015-12-31
Value	1.301	1.271	1.255	1.094	1.586	2.485	3.169	3.032	2.787	2.255	2.255	3.328	2.911	3.598	2.75	2.562
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	5.5	5.3	5.3	0.9	1.2	1.6	2.0	1.8	1.7	1.4	1.4	2.2	2.0	3.0	2.8	2.7
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.0	0.0	0.1	0.1	0.1	0.1	0.1	0.1
Percentage of Assets cnk:DigitalCinemaDistributionCoalition us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2016-12-31	2015-12-31
Value	94	102	120	124	134	131	124	125	119	111	106	87	71
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	79.5	78.4	79.9	80.3	80.8	79.9	78.9	79.9	77.8	76.9	88.5	89.3	75.4
Percentage of Assets	1.6	1.8	2.1	2.1	2.3	2.2	2.1	2.8	2.7	2.5	2.4	2.0	1.7
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:FEConceptsLLC, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	18	18	18	18	18	19	19	19	19	19	19	19	19	0.104
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	79.0	76.3	77.0	15.6	14.3	12.8	12.6	12.0	12.1	12.7	12.7	13.0	13.7	0.1
Percentage of Assets	0.4	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.4	0.5	0.4	0.0
Percentage of Assets cnk:FEConceptsLLC us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:OtherInvestment, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2016-12-31	2015-12-31
Value	0.857	1.117	0.453	0.295	2.885	2.855	2.879	3.276	3.965	4.046	4.075	4.203	4.423	4.212	1.768	0.663
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	3.6	4.7	1.9	0.2	2.2	1.9	1.9	2.0	2.4	2.6	2.6	2.7	3.0	3.5	1.8	0.7
Percentage of Assets	0.0	0.0	0.0	0.0	0.1	0.1	0.0	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.0	0.0
Percentage of Assets cnk:OtherInvestment us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Goodwill

us-gaap:Goodwill

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2009-12-31
Value	1255	1249	1253	1249	1266	1268	1283	1281	1286	1276	1276	1276	1281	1283	1284	1294	1292	1265	1262	1262	1263	1258	1247	1252	1266	1265	1277	1277	1286	1284	1288	1328	1342	1151	1150	1152	1151	1164	1150	1154	1131	1125	1122	1116
Percentage of Goodwill	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	24.1	23.6	22.5	21.5	22.3	22.5	22.0	22.3	21.8	22.0	28.5	29.0	28.8	29.1	28.7	29.6	29.7	28.9	29.3	30.2	30.0	30.5	30.2	31.0	30.4	31.3	30.8	31.5	31.3	31.4	31.1	32.5	32.7	29.9	29.8	32.2	32.5	32.6	32.7	33.4	32.3	33.1	32.8	0.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31	2009-12-31
Value	72	66	70	66	84	85	100	98	103	102	102	102	107	109	110	120	119	101	98	98	98	93	90	95	109	108	120	126	136	134	137	178	181	194	193	195	194	207	202	206	182	174	168
Percentage of Goodwill	5.8	5.3	5.7	5.3	6.6	6.8	7.8	7.7	8.1	8.0	8.0	8.0	8.4	8.6	8.6	9.3	9.2	8.0	7.8	7.8	7.8	7.5	7.3	7.6	8.7	8.6	9.5	9.9	10.6	10.4	10.7	13.4	13.5	16.9	16.8	17.0	16.9	17.8	17.6	17.9	16.2	15.6	15.1
Percentage of Assets	1.4	1.3	1.3	1.1	1.5	1.5	1.7	1.7	1.8	1.8	2.3	2.3	2.4	2.5	2.5	2.8	2.7	2.3	2.3	2.4	2.3	2.3	2.2	2.4	2.6	2.7	2.9	3.1	3.3	3.3	3.3	4.4	4.4	5.0	5.0	5.5	5.5	5.8	5.8	6.0	5.2	5.1	0.0
Percentage of Assets cnk:InternationalOperatingSegment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2012-12-31	2011-12-31
Value	1182	1182	1182	1182	1182	1182	1182	1182	1182	1174	1174	1174	1174	1174	1174	1174	1173	1164	1164	1164	1164	1164	1156	1156	1156	1156	1156	1150	1150	1150	1150	1150	956	948
Percentage of Goodwill	94.2	94.7	94.3	94.7	93.4	93.2	92.2	92.3	91.9	92.0	92.0	92.0	91.6	91.4	91.4	90.7	90.8	92.0	92.2	92.2	92.2	92.5	92.7	92.4	91.3	91.4	90.5	90.1	89.4	89.6	89.3	86.6	83.2	82.4
Percentage of Assets	22.7	22.3	21.3	20.4	20.8	21.0	20.3	20.6	20.0	20.3	26.2	26.7	26.4	26.6	26.3	26.9	26.9	26.6	27.0	27.9	27.6	28.2	28.0	28.6	27.8	28.6	27.9	28.3	27.9	28.1	27.8	28.2	24.8	26.9
Percentage of Assets cnk:UsOperatingSegment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2009-12-31
Value	312	313	314	315	317	318	321	322	324	324	330	330	332	335	336	335	335	333	334	336	337	338	339	341	343	345	348	350	352	353	356	368	371	329	330	332	333	336	336	342	327	328	329	342
Percentage of IntangibleAssetsNetExcludingGoodwill	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	6.0	5.9	5.6	5.4	5.6	5.7	5.5	5.6	5.5	5.6	7.4	7.5	7.5	7.6	7.5	7.7	7.7	7.6	7.8	8.0	8.0	8.2	8.2	8.5	8.3	8.5	8.4	8.6	8.6	8.6	8.6	9.0	9.0	8.5	8.6	9.3	9.4	9.4	9.6	9.9	9.3	9.6	9.6	0.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31	2009-12-31
Value	12	13	14	15	16	18	21	22	23	24	30	30	32	35	37	35	35	34	35	36	37	38	40	42	44	46	47	49	51	52	55	59	61	19	20	22	23	25	27	32	15	18	32
Percentage of FiniteLivedIntangibleAssetsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.2	0.2	0.3	0.3	0.3	0.3	0.4	0.4	0.4	0.4	0.7	0.7	0.7	0.8	0.8	0.8	0.8	0.8	0.8	0.9	0.9	0.9	1.0	1.0	1.1	1.1	1.1	1.2	1.2	1.3	1.3	1.5	1.5	0.5	0.5	0.6	0.7	0.7	0.8	0.9	0.4	0.5	0.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	1229	1246	1278	1286	1315	1338	1383	1384	1429	1443	0.0
Percentage of OperatingLeaseRightOfUseAsset	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	23.6	23.5	23.0	22.2	23.1	23.8	23.7	24.1	24.2	24.9	0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	31	31	33	36	38	36	39	39	41	38	41	47	47	41	39	40	40	39	37	42	41	41	38	82	82	80	77	80	75	87	104	127	121	106	102	76	63	63	63	72	78	85	70
Percentage of OtherAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.6	0.6	0.6	0.6	0.7	0.6	0.7	0.7	0.7	0.7	0.9	1.1	1.1	0.9	0.9	0.9	0.9	0.9	0.9	1.0	1.0	1.0	0.9	2.0	2.0	2.0	1.9	2.0	1.8	2.1	2.5	3.1	3.0	2.8	2.6	2.1	1.8	1.8	1.8	2.1	2.2	2.5	2.1

us-gaap:OtherAssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	674	681	685	693	700	706
Percentage of OtherAssetsNoncurrent	0.0	0.0	2065.3	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	12.3	0.0	0.0	0.0
Percentage of Assets cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	404	354	357	383	359	346	450	388	439	390	426	348	394	329	418	341	361	369	401	304	381	339	396	307	368	300	375	282	293	293	348	283	333	276	293	252	262	251	276	240	246	220	251
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	7.8	6.7	6.4	6.6	6.3	6.2	7.7	6.8	7.4	6.7	9.5	7.9	8.9	7.5	9.4	7.8	8.3	8.4	9.3	7.3	9.0	8.2	9.6	7.6	8.8	7.4	9.1	7.0	7.1	7.2	8.4	6.9	8.1	7.2	7.6	7.1	7.4	7.0	7.9	6.9	7.0	6.5	7.4

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	70	91	104	109	110	108	119	93	70	65	64
Percentage of AccountsPayableCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.3	1.6	2.3	2.5	2.6	2.6	2.9	2.3	1.8	1.9	1.9

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

Period End	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2010-12-31
Value	0.055	5.632	0.51	3.969	5.195	12	22	31	12	8.708	6.85	11	5.509	7.893	3.766	30	5.071	9.244	12	12	7.332	8.582	15	17	6.396	12	24	35	22	19	23	19	8.891	7.169	5.467	22	6.506	1.368	0.0
Percentage of AccruedIncomeTaxesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	0.0	0.1	0.0	0.1	0.1	0.2	0.4	0.6	0.3	0.2	0.2	0.3	0.1	0.2	0.1	0.7	0.1	0.2	0.3	0.3	0.2	0.2	0.4	0.4	0.2	0.3	0.6	0.9	0.5	0.5	0.6	0.5	0.2	0.2	0.2	0.6	0.2	0.0	0.0

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	651	594	606	623	596	600	708	639	700	656	474	391	439	387	468	392	405	439	443	347	426	389	439	351	419	351	414	319	341	353	395	325	385	321	338	282	290	295	305	261	264	239	271
Percentage of LiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	12.5	11.2	10.9	10.8	10.5	10.7	12.2	11.1	11.9	11.3	10.6	8.9	9.9	8.8	10.5	9.0	9.3	10.0	10.3	8.3	10.1	9.4	10.7	8.7	10.1	8.7	10.0	7.9	8.3	8.6	9.5	8.0	9.4	8.3	8.8	7.9	8.2	8.3	8.7	7.6	7.5	7.0	7.9

us-gaap:LiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	40	37	46	47	46	125
Percentage of LiabilitiesCurrent	0.0	0.0	7.7	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.8	0.0	0.0	0.0
Percentage of Assets cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:LiabilitiesCurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	13	23	39	58	56	70
Percentage of LiabilitiesCurrent	2.1	3.9	6.6	9.4	9.6	9.9
Percentage of Assets	0.3	0.4	0.7	1.0	1.0	1.2
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0

Long Term Debt Current

us-gaap:LongTermDebtCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	20	18	18	7.965	7.349	6.595	6.595	7.984	7.984	7.984	7.984	7.984	7.984	7.984	7.099	7.099	7.099	7.099	5.671	4.244	2.816	8.397	8.405	8.412	8.423	8.423	8.423	8.389	8.389	9.124	9.856	9.014	8.151	8.824	9.546	11	12	12	12	11	9.244	10	10
Percentage of LongTermDebtCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.4	0.3	0.3	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.1	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	211	206	208	216	213	213	217	215	215	211	0.0
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	4.1	3.9	3.7	3.7	3.7	3.8	3.7	3.7	3.6	3.7	0.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	217	175	148	120	110	112	132	134	89	82	74
Percentage of OtherAccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	3.9	3.0	3.3	2.7	2.6	2.7	3.2	3.2	2.3	2.3	2.2

us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	38	24	20	15
Percentage of OtherAccruedLiabilitiesCurrent	17.6	14.2	13.5	12.6
Percentage of Assets	0.7	0.4	0.4	0.3
Percentage of Assets srt:ParentCompany	3.3	1.7	1.4	1.1

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	4163	4178	4157	4160	3995	3766	3670	3615	3674	3669	2551	2536	2551	2554	2596	2627	2613	2610	2590	2595	2589	2587	2575	2596	2609	2601	2614	2612	2618	2635	2646	2647	2652	2424	2430	2211	2193	2212	2193	2167	2160	2114	2116
Percentage of LiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	79.9	78.9	74.7	71.7	70.2	66.9	63.0	62.9	62.3	63.4	56.9	57.7	57.3	57.9	58.1	60.1	60.0	59.6	60.2	62.2	61.4	62.7	62.4	64.2	62.7	64.3	63.0	64.3	63.6	64.5	63.8	64.8	64.5	62.9	62.9	61.7	61.9	61.9	62.3	62.7	61.7	62.1	61.9

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-12-31	2020-09-24	2020-06-25	2019-12-26
Value	1115	1116	1072	1073	1074	947
Percentage of LiabilitiesNoncurrent	0.0	0.0	25.8	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	19.3	0.0	0.0	0.0
Percentage of Assets cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	0.355	0.94	0.687	0.71	0.733	0.19
Percentage of LiabilitiesNoncurrent	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0

Long Term Debt

us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	2547	2538	2527	2412	2152	1898	1801	1804	1806	1807	1809	1812	1813	1815	1817	1820	1821	1822	1822	1824	1824	1837	1814	1817	1819	1821	1822	1826	1827	1830	1832	1826	1827	1761	1764	1563	1566	1569	1572	1574	1570	1532
Percentage of LongTermDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	48.9	47.9	45.4	41.6	37.8	33.7	30.9	31.4	30.6	31.2	40.4	41.2	40.7	41.1	40.6	41.6	41.8	41.6	42.3	43.7	43.3	44.5	44.0	44.9	43.7	45.0	43.9	45.0	44.4	44.8	44.2	44.7	44.5	45.7	45.7	43.7	44.2	43.9	44.6	45.5	44.8	44.8

us-gaap:LongTermDebt us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31
Value	352
Percentage of LongTermDebt	13.9
Percentage of Assets	6.3
Percentage of Assets srt:ParentCompany	30.1

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	2478	2476	2377	2366	2117	1869	1771	1771	1771	1772	1772	1774	1774	1775	1780	1781	1782	1782	1782	1786	1786	1793	1772	1809	1811	1812	1814	1817	1819	1821	1822	1817	1819	1752	1754	1551	1554	1557	1560	1562	1561	1519	1521
Percentage of LongTermDebtNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	47.5	46.8	42.7	40.8	37.2	33.2	30.4	30.8	30.0	30.6	39.6	40.4	39.8	40.2	39.8	40.8	40.9	40.7	41.4	42.8	42.4	43.4	43.0	44.7	43.5	44.8	43.7	44.8	44.2	44.5	44.0	44.5	44.3	45.4	45.4	43.3	43.9	43.6	44.3	45.2	44.6	44.6	44.5

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	45	39	79	103	152	157	141
Percentage of DeferredIncomeTaxLiabilitiesNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.9	0.7	1.4	1.8	2.7	2.8	2.4

Minority Interest

us-gaap:MinorityInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2009-12-31
Value	10	10	10	11	11	12	12	12	12	11	12	12	12	12	11	11	11	11	11	12	11	11	11	11	11	10	10	9.83	9.438	9.254	8.995	10	11	11	10	11	11	11	10	11	11	11	11	11	11	14
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.0	0.0	0.0

us-gaap:MinorityInterest dei:LegalEntity

cnk:CinemarkPartnersSecond

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	7.706	7.953	8.152	8.795	8.249	7.753	7.769	7.467	7.701	7.864	8.655
Percentage of MinorityInterest	70.1	63.6	65.9	74.0	74.0	69.8	75.2	83.0	70.5	73.1	74.6
Percentage of Assets	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3
Percentage of Assets cnk:CinemarkPartnersSecond	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:GreeleyLtd

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	1.101	1.908	1.411	0.843	0.689	0.74	0.589	0.555	0.622	0.695	0.857
Percentage of MinorityInterest	10.0	15.3	11.4	7.1	6.2	6.7	5.7	6.2	5.7	6.5	7.4
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:GreeleyLtd	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:LaredoTheatre

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31
Value	1.681	2.139	2.308	1.746	1.695	1.761	1.112	0.52	0.913	0.372
Percentage of MinorityInterest	15.3	17.1	18.6	14.7	15.2	15.9	10.8	5.8	8.4	3.5
Percentage of Assets	0.0	0.0	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:LaredoTheatre	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:OtherNoncontrollingInterests

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31
Value	0.508	0.508	0.508	0.509	0.509	0.851	0.859
Percentage of MinorityInterest	4.6	4.1	4.1	4.3	4.6	7.7	8.3
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:OtherNoncontrollingInterests	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	52	60	74	62	63	64	44	43	40	31	50	47	48	45	41	44	45	44	44	46	47	48	60	66	65	65	67	70	71	73	74	78	82	55	59	62	47	44	46	50	51	53	53
Percentage of OtherLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.0	1.1	1.3	1.1	1.1	1.1	0.8	0.8	0.7	0.6	1.1	1.1	1.1	1.0	0.9	1.0	1.1	1.0	1.0	1.1	1.1	1.2	1.5	1.6	1.6	1.6	1.6	1.7	1.7	1.8	1.8	1.9	2.0	1.4	1.5	1.7	1.3	1.3	1.3	1.5	1.5	1.6	1.6

us-gaap:OtherLiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	-9.71	1.036	0.917	0.734
Percentage of OtherLiabilitiesNoncurrent	-13.0	2.4	1.8	1.7
Percentage of Assets	-0.2	0.0	0.0	0.0
Percentage of Assets srt:ParentCompany	-0.8	0.1	0.1	0.1

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	1085	1107	1138	1137	1167	1186	1223	1230	1274	1284	0.0
Percentage of OperatingLeaseLiabilityNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	20.8	20.9	20.5	19.6	20.5	21.1	21.0	21.4	21.6	22.2	0.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2020-12-31
Value	250
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0
Percentage of Assets	4.5

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2020-12-31
Value	225
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0
Percentage of Assets	4.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2020-12-31
Value	194
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0
Percentage of Assets	3.5

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

Period End	2020-12-31
Value	166
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive	100.0
Percentage of Assets	3.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

Period End	2020-12-31
Value	508
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100.0
Percentage of Assets	9.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

Period End	2020-12-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1346	1440	1445	1489	1495
Percentage of OperatingLeaseLiability	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	24.2	24.7	25.1	25.2	25.8

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2020-12-31
Value	1613
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0
Percentage of Assets	29.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2020-12-31
Value	266
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0
Percentage of Assets	4.8

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2009-12-31
Value	387	513	787	1007	1086	1253	1435	1483	1515	1451	1443	1456	1451	1459	1393	1339	1323	1321	1261	1221	1188	1139	1099	1084	1124	1082	1112	1119	1146	1090	1093	1099	1062	1099	1084	1076	1046	1054	1012	1018	1068	1037	1021	983	948	899
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	7.4	9.7	14.2	17.4	19.1	22.2	24.6	25.8	25.7	25.1	32.2	33.1	32.6	33.1	31.2	30.6	30.4	30.2	29.3	29.2	28.2	27.6	26.6	26.8	27.0	26.8	26.8	27.6	27.9	26.7	26.4	26.9	25.8	28.5	28.1	30.1	29.6	29.5	28.8	29.4	30.5	30.5	29.9	0.0	0.0	0.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	787	1435	1443	1393
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0
Percentage of Assets	14.2	24.6	32.2	31.2
Percentage of Assets srt:ParentCompany	67.4	98.2	98.6	98.9

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2009-12-31	2008-12-31
Value	397	523	798	1018	1098	1265	1448	1496	1527	1463	1456	1469	1463	1471	1405	1351	1335	1333	1272	1233	1200	1150	1110	1096	1135	1093	1123	1129	1156	1100	1102	1110	1073	1110	1094	1088	1058	1065	1023	1029	1079	1049	1033	995	959	914	824
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	7.6	9.9	14.4	17.6	19.3	22.5	24.9	26.0	25.9	25.3	32.5	33.4	32.9	33.4	31.4	30.9	30.7	30.4	29.6	29.5	28.5	27.9	26.9	27.1	27.3	27.0	27.1	27.8	28.1	26.9	26.6	27.2	26.1	28.8	28.3	30.4	29.9	29.8	29.1	29.8	30.8	30.8	30.2	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	26	6.094	-3.954	430	461	562
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6.6	1.2	-0.5	42.3	42.0	38.8
Percentage of Assets	0.5	0.1	-0.1	7.4	8.1	9.6
Percentage of Assets cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	-391.162	-401.29	-398.653	-414.398	-422.092	-421.908	-340.112	-349.381	-322.633	-321.634	-319.007	-320.166	-309.306	-252.942	-253.282	-247.013	-271.686	-144.772	-81.819	-37.698	-23.682	28	-7.459	-72.347
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-98.3	-76.6	-49.9	-40.7	-38.4	-33.3	-23.5	-23.3	-21.1	-22.0	-21.9	-21.8	-21.1	-17.2	-18.0	-19.4	-24.5	-12.9	-7.4	-3.4	-2.3	2.7	-0.8	-8.8
Percentage of Assets	-7.5	-7.6	-7.2	-7.1	-7.4	-7.5	-5.8	-6.1	-5.5	-5.6	-7.1	-7.3	-6.9	-5.7	-5.7	-5.7	-6.6	-3.5	-2.0	-1.0	-0.7	0.8	0.0	0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	1182	1176	1245	1238	1178	1174	1170	1165	1162	1158	1155	1151	1147	1144	1141	1128	1113	1095	1079	1064	1047	1037	1011	962
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	297.3	224.6	155.9	121.6	107.3	92.8	80.8	77.9	76.1	79.1	79.3	78.4	78.4	77.8	81.2	88.6	100.2	97.5	97.9	97.2	102.3	100.4	110.6	116.8
Percentage of Assets	22.7	22.2	22.4	21.3	20.7	20.8	20.1	20.3	19.7	20.0	25.8	26.2	25.8	25.9	25.5	26.2	27.0	26.4	26.0	27.5	29.7	30.3	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	0.125	0.124	0.124	0.123	0.122	0.122	0.122	0.122	0.122	0.121	0.121	0.121	0.121	0.121	0.121	0.121	0.12	0.12	0.119	0.118	0.118	0.117	0.114	0.109
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:NoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	10	10	10	11	11	12	12	12	12	11	12	12	12	12	11	11	11	10	8.995	10	10	11	14	12
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2.7	2.0	1.4	1.1	1.1	1.0	0.9	0.9	0.8	0.8	0.9	0.9	0.8	0.8	0.8	0.9	1.0	0.9	0.8	1.0	1.1	1.1	1.6	1.6
Percentage of Assets	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.2	0.2	0.3	0.3	0.3	0.0	0.0
Percentage of Assets us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	387	513	787	1007	1086	1253	1435	1483	1515	1451	1443	1456	1451	1459	1393	1261	1099	1112	1093	1084	1012	1021	899	811
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	97.3	98.0	98.6	98.9	98.9	99.0	99.1	99.1	99.2	99.2	99.1	99.1	99.2	99.2	99.2	99.1	99.0	99.1	99.2	99.0	98.9	98.9	98.4	98.4
Percentage of Assets	7.4	9.7	14.2	17.4	19.1	22.2	24.6	25.8	25.7	25.1	32.2	33.1	32.6	33.1	31.2	29.3	26.6	26.8	26.4	28.1	28.8	29.9	0.0	0.0
Percentage of Assets us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	-317.329	-174.866	27	267	414	585	687	748	757	696	686	704	691	647	582	453	324	224	147	106	34	0.388	-60.595	-78.859
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-79.8	-33.4	3.5	26.2	37.7	46.2	47.5	50.0	49.6	47.6	47.1	47.9	47.3	44.0	41.4	35.6	29.2	20.0	13.4	9.7	3.4	0.0	-6.6	-9.6
Percentage of Assets	-6.1	-3.3	0.5	4.6	7.3	10.4	11.8	13.0	12.8	12.0	15.3	16.0	15.5	14.7	13.0	10.5	7.9	5.4	3.6	2.7	1.0	0.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:TreasuryStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	-87.016	-87.012	-87.004	-84.432	-84.365	-84.258	-81.567	-81.506	-81.506	-81.206	-79.259	-79.259	-79.259	-79.049	-76.354	-73.411	-66.577	-61.807	-51.946	-48.482	-45.219	-44.725	-43.895
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-21.9	-16.6	-10.9	-8.3	-7.7	-6.7	-5.6	-5.4	-5.3	-5.5	-5.4	-5.4	-5.4	-5.4	-5.4	-5.8	-6.0	-5.5	-4.7	-4.4	-4.4	-4.3	-4.8
Percentage of Assets	-1.7	-1.6	-1.6	-1.5	-1.5	-1.5	-1.4	-1.4	-1.4	-1.4	-1.8	-1.8	-1.8	-1.8	-1.7	-1.7	-1.6	-1.5	-1.3	-1.3	-1.3	-1.3	0.0
Percentage of Assets us-gaap:TreasuryStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Value

us-gaap:CommonStockValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	125000.0	124000.0	124000.0	123000.0	122000.0	122000.0	122000.0	122000.0	122000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	121000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	120000.0	119000.0	119000.0	119000.0	119000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	118000.0	117000.0
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	124000.0	122000.0	121000.0	121000.0
Percentage of CommonStockValue	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets srt:ParentCompany	0.0	0.0	0.0	0.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	1182	1176	1245	1238	1178	1174	1170	1165	1162	1158	1155	1151	1147	1144	1141	1137	1134	1131	1128	1125	1122	1120	1113	1107	1103	1100	1095	1092	1089	1086	1079	1073	1074	1070	1064	1058	1055	1051	1047	1044	1042	1040	1037
Percentage of AdditionalPaidInCapitalCommonStock	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	22.7	22.2	22.4	21.3	20.7	20.8	20.1	20.3	19.7	20.0	25.8	26.2	25.8	25.9	25.5	26.0	26.1	25.8	26.2	26.9	26.6	27.1	27.0	27.4	26.5	27.2	26.4	26.9	26.5	26.6	26.0	26.3	26.1	27.8	27.5	29.5	29.8	29.4	29.7	30.2	29.7	30.6	30.3

us-gaap:AdditionalPaidInCapitalCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	1245	1170	1155	1141
Percentage of AdditionalPaidInCapitalCommonStock	100.0	100.0	100.0	100.0
Percentage of Assets	22.4	20.1	25.8	25.5
Percentage of Assets srt:ParentCompany	106.6	80.0	78.9	80.9

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	-317.329	-174.866	27	267	414	585	687	748	757	696	686	704	691	647	582	521	516	499	453	408	374	351	324	296	278	237	224	205	196	154	147	161	110	114	106	102	79	52	34	40	17	1.294	0.388
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	-6.1	-3.3	0.5	4.6	7.3	10.4	11.8	13.0	12.8	12.0	15.3	16.0	15.5	14.7	13.0	11.9	11.9	11.4	10.5	9.8	8.9	8.5	7.9	7.3	6.7	5.9	5.4	5.1	4.8	3.8	3.6	4.0	2.7	3.0	2.7	2.9	2.3	1.5	1.0	1.2	0.5	0.0	0.0

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	27	687	686	582
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	100.0
Percentage of Assets	0.5	11.8	15.3	13.0
Percentage of Assets srt:ParentCompany	2.4	47.0	46.9	41.3

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31
Value	-391.162	-401.29	-398.653	-414.398	-422.092	-421.908	-340.112	-349.381	-322.633	-321.634	-319.007	-320.166	-309.306	-252.942	-253.282	-242.894	-251.969	-233.473	-247.013	-238.672	-234.992	-260.047	-271.686	-252.276	-191.732	-189.546	-144.772	-117.384	-77.872	-88.232	-81.819	-83.517	-70.739	-34.024	-37.698	-36.387	-39.544	-1.846	-23.682	-21.665	53	40	28
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	-7.5	-7.6	-7.2	-7.1	-7.4	-7.5	-5.8	-6.1	-5.5	-5.6	-7.1	-7.3	-6.9	-5.7	-5.7	-5.6	-5.8	-5.3	-5.7	-5.7	-5.6	-6.3	-6.6	-6.2	-4.6	-4.7	-3.5	-2.9	-1.9	-2.2	-2.0	-2.0	-1.7	-0.9	-1.0	-1.0	-1.1	-0.1	-0.7	-0.6	1.5	1.2	0.8

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	-398.653	-340.112	-319.007	-253.282
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0
Percentage of Assets	-7.2	-5.8	-7.1	-5.7
Percentage of Assets srt:ParentCompany	-34.1	-23.3	-21.8	-18.0

Treasury Stock Value

us-gaap:TreasuryStockValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2009-12-31
Value	87	87	87	84	84	84	81	81	81	81	79	79	79	79	76	76	76	76	73	73	73	72	66	66	66	66	61	61	61	61	51	51	51	51	48	48	48	47	45	45	45	45	44	43
Percentage of TreasuryStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.7	1.6	1.6	1.5	1.5	1.5	1.4	1.4	1.4	1.4	1.8	1.8	1.8	1.8	1.7	1.7	1.8	1.7	1.7	1.8	1.7	1.7	1.6	1.6	1.6	1.6	1.5	1.5	1.5	1.5	1.3	1.3	1.3	1.3	1.3	1.4	1.4	1.3	1.3	1.3	1.3	1.3	1.3	0.0

us-gaap:TreasuryStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	87	81	79	76
Percentage of TreasuryStockValue	100.0	100.0	100.0	100.0
Percentage of Assets	1.6	1.4	1.8	1.7
Percentage of Assets srt:ParentCompany	7.4	5.6	5.4	5.4

Minority Interest

us-gaap:MinorityInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2009-12-31
Value	10	10	10	11	11	12	12	12	12	11	12	12	12	12	11	11	11	11	11	12	11	11	11	11	11	10	10	9.83	9.438	9.254	8.995	10	11	11	10	11	11	11	10	11	11	11	11	11	11	14
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.0	0.0	0.0

us-gaap:MinorityInterest dei:LegalEntity

cnk:CinemarkPartnersSecond

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	7.706	7.953	8.152	8.795	8.249	7.753	7.769	7.467	7.701	7.864	8.655
Percentage of MinorityInterest	70.1	63.6	65.9	74.0	74.0	69.8	75.2	83.0	70.5	73.1	74.6
Percentage of Assets	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3
Percentage of Assets cnk:CinemarkPartnersSecond	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:GreeleyLtd

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	1.101	1.908	1.411	0.843	0.689	0.74	0.589	0.555	0.622	0.695	0.857
Percentage of MinorityInterest	10.0	15.3	11.4	7.1	6.2	6.7	5.7	6.2	5.7	6.5	7.4
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:GreeleyLtd	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:LaredoTheatre

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31
Value	1.681	2.139	2.308	1.746	1.695	1.761	1.112	0.52	0.913	0.372
Percentage of MinorityInterest	15.3	17.1	18.6	14.7	15.2	15.9	10.8	5.8	8.4	3.5
Percentage of Assets	0.0	0.0	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:LaredoTheatre	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

cnk:OtherNoncontrollingInterests

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31
Value	0.508	0.508	0.508	0.509	0.509	0.851	0.859
Percentage of MinorityInterest	4.6	4.1	4.1	4.3	4.6	7.7	8.3
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets cnk:OtherNoncontrollingInterests	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	5.908	4.668	4.428	4.321	4.111	3.84	3.677	2.97	3.972	3.486	3.452	3.426	3.194	3.043	3.203	3.241	3.147	2.587	2.542	5.118	5.908	3.375	2.977	3.498	3.254	2.975	3.066	3.523	6.54	3.558	3.338	3.45	4.905	3.297	3.553	3.315	2.56	2.56	2.559	2.013	3.173	1.925
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	5.907	4.668	4.427	4.321	4.111	3.84	3.676	2.97	3.486	3.452	3.426
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	5.908	4.668	4.428	4.321	4.111	3.84	3.677	2.97	3.972	3.486	3.452	3.426	3.194	3.043	3.203	3.241	3.147	2.587	2.542	5.118	5.908	3.375	2.977	3.498	3.254	2.975	3.066	3.523	6.54	3.558	3.338	3.45	4.905	3.297	3.553	3.315	2.56	2.56	2.559	2.013	3.173	1.925
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	102	-124.079	-162.445	-13.783	-138.309	-15.561	164	93	199	104	206	70	196	83	217	75	25	231	63	97	61	131	65	70	42	121	98	77	97	98	109	121	61	110	45	64	44
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	34.8	-108.5	-165.4	-38.8	-1541.2	-2.9	20.9	11.4	20.8	14.6	25.9	9.3	22.1	10.7	29.0	10.7	3.9	35.1	9.8	13.6	10.3	20.1	8.6	9.8	7.8	19.8	15.6	12.0	16.9	18.4	17.2	19.6	12.6	21.1	8.2	11.9	8.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-13.165	-17.659	-15.91	-20.645	-12.673	-34.138	-114.337	-71.119	-67.674	-57.512	-98.841	-161.1	-112.507	-78.922	-120.384	-80.518	-86.723	-97.219	-53.208	-49.211	-53.701	29	-59.514	-303.226	-31.195	-73.066	-53.839	-46.072	-61.334	-57.789	-107.454	-45.968	-35.856	-50.295	-30.316	-35.786	-19.67
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-4.5	-15.4	-16.2	-58.2	-141.2	-6.3	-14.5	-8.7	-7.1	-8.0	-12.4	-21.4	-12.7	-10.1	-16.1	-11.3	-13.4	-14.7	-8.2	-6.9	-8.9	4.5	-7.9	-41.8	-5.7	-11.9	-8.5	-7.1	-10.6	-10.8	-16.8	-7.4	-7.4	-9.6	-5.4	-6.6	-3.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-7.755	0.848	6.904	286	242	47	-47.442	-45.474	-45.68	-47.91	-48.104	-45.434	-45.664	-53.446	-43.609	-31.302	-37.098	-36.823	-34.135	-34.438	-41.437	-37.486	-38.965	29	-29.081	154	-29.679	-29.568	-32.218	-29.414	-28.263	7.921	-28.658	-27.32	-25.583	-24.968	-28.779
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-2.6	0.7	7.0	808.5	2704.4	8.8	-6.0	-5.5	-4.8	-6.7	-6.0	-6.0	-5.1	-6.9	-5.8	-4.4	-5.7	-5.6	-5.3	-4.8	-6.9	-5.7	-5.1	4.0	-5.3	25.3	-4.7	-4.6	-5.6	-5.5	-4.4	1.3	-5.9	-5.2	-4.6	-4.6	-5.6

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	83	-142.51	-170.368	253	92	-8.914	5.541	-28.62	86	-1.028	59
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	28.2	-124.6	-173.4	715.8	1029.2	-1.6	0.7	-3.5	9.0	-0.1	7.4

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	2683000.0	2590000.0	2390000.0	2025000.0	1589000.0	1328000.0	1328000.0	1328000.0	1327000.0	1328000.0	1325000.0	1323000.0	1323000.0	1590000.0	1578000.0	1556000.0	1534000.0	1529000.0	1424000.0	1404000.0	1378000.0	1286000.0	1275000.0	1276000.0	1288000.0	1312000.0	1311000.0	1311000.0	1312000.0	1311000.0	1311000.0	1309000.0	1470000.0	1386000.0	1217000.0	1189000.0	1189000.0	1197000.0	1187000.0	1186000.0	1187000.0	1184000.0	1183000.0	1176000.0	1176000.0	1181000.0
Percentage of AmortizationOfFinancingCosts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	4.351	-18.07	-8.959	-33.321	-11.984	15	3.471	-11.154	16	-10.964	14	1.427	7.741	-0.072	-24.556	-4.974	5.626	8.889	-21.849	14	5.034	-2.933	20	-1.628	6.407	-14.349	21	1.027	-5.567	-16.436	-3.703	8.994	-23.916	-19.165	-1.655	10	-1.635	-2.358	11	4.655	10	-4.77	4.402	1.171	-3.648	-10.528
Percentage of DeferredIncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	66	68	68	62	63	65	64	67	64	64	67	64	64	64	62	58	59	57	53	54	52	49	49	47	46	45	44	44	43	42	43	42	38	39	37	36	36	36	34	40	39	38	39	34	34	33
Percentage of DepreciationDepletionAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-152.573	-14.193	-65.815	54	66	17	-5.201	-4.814	46	-25.045	52	21	33	0.064	54	-18.951	40	39	-24.688	51	22	15	10	-68.791	65	-26.008	14	-46.158	3.935	10	-9.684	-13.828	-24.471	1.509	5.642	-27.796	137	-75.019	26
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	102	-124.079	-162.445	-13.783	-138.309	-15.561	164	93	199	104	206	70	196	83	217	75	25	231	63	97	61	131	65	70	42	121	98	77	97	98	109	121	61	110	45	64	44
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	34.8	-108.5	-165.4	-38.8	-1541.2	-2.9	20.9	11.4	20.8	14.6	25.9	9.3	22.1	10.7	29.0	10.7	3.9	35.1	9.8	13.6	10.3	20.1	8.6	9.8	7.8	19.8	15.6	12.0	16.9	18.4	17.2	19.6	12.6	21.1	8.2	11.9	8.5

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-142.467	-208.241	-239.256	-147.592	-170.389	-59.591	26	31	100	32	19	50	82	62	95	38	51	79	77	65	53	58	57	46	70	42	47	38	71	35	15	80	20	32	27	47	51	42	18	46	40	24	38	33	39	35
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-243.5	-416.0	-1898.7	-11.0	3.3	3.8	10.5	4.6	2.4	6.7	9.2	8.0	12.7	5.4	6.8	10.2	11.0	8.5	7.2	8.3	8.2	6.6	8.8	6.6	7.2	5.9	10.0	5.9	2.4	10.6	2.8	6.0	4.5	7.5	7.9	7.3	3.4	7.3	6.5	5.2	7.2	5.9	7.4	6.8

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-07-01	2021-04-01	2020-09-24	2020-06-25	2020-03-26	2019-09-26	2019-06-27
Value	-46.867	-43.497	-34.95	-37.8	-8.6	25	23
Percentage of NetIncomeLoss	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:Ncm	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-142.281	-208.843	-239.674	-148.036	-170.816	-59.422	26	31	101	33	20	50	82	62	95	38	51	80	77	66	54	59	58	46	70	42	47	38	72	35	15	80	20	33	28	47	52	42	18	47	41	25	38	33	40	36
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.3	-182.6	-244.0	-417.3	-1903.5	-10.9	3.4	3.9	10.6	4.6	2.5	6.7	9.3	8.0	12.7	5.4	6.9	10.3	11.0	8.6	7.3	8.4	8.2	6.7	8.9	6.6	7.2	6.0	10.0	5.9	2.4	10.7	2.9	6.0	4.7	7.6	8.0	7.4	3.5	7.4	6.6	5.2	7.3	6.0	7.6	7.1

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	20	3.901	-34.583	-30.554	-37.966	-11.14	26	22	28
Percentage of ProfitLoss	-14.1	-1.9	14.4	20.6	22.2	18.7	98.7	70.0	28.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	6.8	3.4	-35.2	-86.1	-423.1	-2.0	3.4	2.7	3.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cnk:DigitalCinemaImplementationPartners us-gaap:OtherAffiliates	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	0.186	-0.602	-0.444	-0.427	0.169	0.602	0.89	0.465	0.393	0.329	0.156
Percentage of ProfitLoss	-0.1	0.3	0.3	0.2	-0.3	1.9	0.9	1.4	0.8	0.4	0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-0.5	-1.3	-4.8	0.0	0.1	0.1	0.1	0.1	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	-142.467	-208.241	-147.592	-170.389	-59.591	31	100	32	50	82	62	57	46	70	42	47	38	71	35	15	80	20	32
Percentage of ProfitLoss	100.1	99.7	99.7	99.8	100.3	98.1	99.1	98.6	99.2	99.6	99.7	99.2	99.2	99.1	99.1	99.3	99.0	99.4	99.3	98.0	99.1	97.3	98.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-416.0	-1898.7	-11.0	3.8	10.5	4.6	6.7	9.2	8.0	8.2	6.6	8.8	6.6	7.2	5.9	10.0	5.9	2.4	10.6	2.8	6.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-142.467	-208.241	-147.592	-170.389	-59.591	31	100	32	50	82	62
Percentage of ProfitLoss	100.1	99.7	99.7	99.8	100.3	98.1	99.1	98.6	99.2	99.6	99.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-48.4	-182.1	-416.0	-1898.7	-11.0	3.8	10.5	4.6	6.7	9.2	8.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	5.907	4.668	6.545	4.427	4.321	4.111	4.129	3.84	3.676	2.97	3.972	3.486	3.452	3.426	3.194	3.043	3.203	3.241	3.147	2.587	2.542	5.118	5.908	3.375	2.977	3.498	3.254	2.975	3.066	3.523	6.54	3.558	3.338	3.45	4.905	3.297	3.553	3.315	2.56	2.56	2.559	2.013	3.173	1.925	1.941	1.313
Percentage of ShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-13.165	-17.659	-15.91	-20.645	-12.673	-34.138	-114.337	-71.119	-67.674	-57.512	-98.841	-161.1	-112.507	-78.922	-120.384	-80.518	-86.723	-97.219	-53.208	-49.211	-53.701	29	-59.514	-303.226	-31.195	-73.066	-53.839	-46.072	-61.334	-57.789	-107.454	-45.968	-35.856	-50.295	-30.316	-35.786	-19.67
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-4.5	-15.4	-16.2	-58.2	-141.2	-6.3	-14.5	-8.7	-7.1	-8.0	-12.4	-21.4	-12.7	-10.1	-16.1	-11.3	-13.4	-14.7	-8.2	-6.9	-8.9	4.5	-7.9	-41.8	-5.7	-11.9	-8.5	-7.1	-10.6	-10.8	-16.8	-7.4	-7.4	-9.6	-5.4	-6.6	-3.8

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	15	17	16	20	12	34	117	71	57	57	100	83	82	80	118	79	91	91	96	98	83	47	99	76	69	85	88	53	49	52	100	69	53	36	74	52	46	46	58	40	49	35	67	31	37	19
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	3.656	4.039	6.89	2.756	1.788	8.47	35	20	12	5.23	24	17	22	10	18	14	14	12	29	22	25	6.547	43	27	26	11	37	17	19	22
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	24.1	22.8	42.2	13.3	14.0	24.8	30.0	29.0	20.8	9.1	24.3	21.5	27.6	12.7	15.8	17.9	15.8	13.6	30.6	23.3	30.6	13.7	43.5	36.2	37.2	13.4	41.9	32.2	38.7	42.6

us-gaap:OperatingSegments, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	11	13	9.422	17	11	25	81	50	45	52	75	65	59	69	99	65	77	78	67	75	58	41	56	48	43	74	51	36	30	30
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	75.9	77.2	57.8	86.7	86.0	75.2	70.0	71.0	79.2	90.9	75.7	78.5	72.4	87.3	84.2	82.1	84.2	86.4	69.4	76.7	69.4	86.3	56.5	63.8	62.8	86.6	58.1	67.8	61.3	57.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-7.755	0.848	6.904	286	242	47	-47.442	-45.474	-45.68	-47.91	-48.104	-45.434	-45.664	-53.446	-43.609	-31.302	-37.098	-36.823	-34.135	-34.438	-41.437	-37.486	-38.965	29	-29.081	154	-29.679	-29.568	-32.218	-29.414	-28.263	7.921	-28.658	-27.32	-25.583	-24.968	-28.779
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-2.6	0.7	7.0	808.5	2704.4	8.8	-6.0	-5.5	-4.8	-6.7	-6.0	-6.0	-5.1	-6.9	-5.8	-4.4	-5.7	-5.6	-5.3	-4.8	-6.9	-5.7	-5.1	4.0	-5.3	25.3	-4.7	-4.6	-5.6	-5.5	-4.4	1.3	-5.9	-5.2	-4.6	-4.6	-5.6

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	2.205	1.999	1.744	1.649	1.649	1.649	3.037	1.649	1.649	1.649	3.038	1.648	1.649	1.649	2.816	1.428	1.388	0.0	13	1.758	3.146	1.758	1.758	1.758
Percentage of RepaymentsOfLongTermDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends us-gaap:AwardType

us-gaap:PaymentsOfDividends

us-gaap:RestrictedStockUnitsRSU

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30
Value	-1000.0	63000.0	366000.0	13000.0	19000.0	544000.0	11000.0	0	0	375000.0	0	25000.0	-21000.0	522000.0	245000.0	0	245000.0	68000.0	0	0	258000.0	404000.0	0	0	396000.0	46000.0	11000.0	0
Percentage of PaymentsOfDividends	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	0.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2015-03-30	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2014-03-30	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	0.0	0.0	0.0	42	39	39	39	39	37	37	37	37	33	33	33	33	31	31	31	31	28	28	28	28	28	28	28	28	28	28	28	28	24	24	24	24	24	23	23	23	23	23	23	20	20	20
Percentage of PaymentsOfDividendsCommonStock	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage

Period End	2020-12-31	2013-12-31	2012-12-31	2011-12-31	2011-09-30	2009-12-31
Value	4.5	0.04875	0.05125	0.07375	0.07375	0.08625
Percentage of DebtInstrumentInterestRateStatedPercentage	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

cnk:EightPointSevenFivePercentSeniorSecuredNoteDueTwentyTwentyFive

Period End	2020-12-31
Value	8.75
Percentage of DebtInstrumentInterestRateStatedPercentage	194.4
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations cnk:EightPointSevenFivePercentSeniorSecuredNoteDueTwentyTwentyFive	0.0

cnk:FourPointFiveZeroConvertibleSeniorNotes

Period End	2020-09-30
Value	4.5
Percentage of DebtInstrumentInterestRateStatedPercentage	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations cnk:FourPointFiveZeroConvertibleSeniorNotes	0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:StatementScenario, us-gaap:DebtInstrument

srt:ScenarioForecast, cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2022-09-13
Value	0.05125
Percentage of DebtInstrumentInterestRateStatedPercentage	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ScenarioForecast cnk:FivePointOneTwoFivePercentSeniorNote	0.0

srt:ScenarioForecast, cnk:FourPointEightSevenFivePercentSeniorNotes

Period End	2023-02-27
Value	0.04875
Percentage of DebtInstrumentInterestRateStatedPercentage	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ScenarioForecast cnk:FourPointEightSevenFivePercentSeniorNotes	0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations us-gaap:EnvironmentalRemediationContingency, us-gaap:UnusualOrInfrequentItem

us-gaap:EffectiveIncomeTaxRateContinuingOperations

cnk:CoronavirusAidReliefAndEconomicSecurityAct, us-gaap:NaturalDisastersAndOtherCasualtyEvents

Period End	2020-09-30	2019-09-30
Value	45.0	30.5
Percentage of EffectiveIncomeTaxRateContinuingOperations	100.0	100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	79	132	146	117	132	137	379	400	364	344	307
Percentage of DeferredTaxLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilities us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31
Value	72	137	152	114	125	133	118
Percentage of DeferredTaxLiabilities	90.8	103.4	103.7	97.4	94.3	96.9	31.1

us-gaap:ForeignCountry

Period End	2020-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31
Value	7.28	3.073	7.571	4.212	12
Percentage of DeferredTaxLiabilities	9.2	2.6	5.7	3.1	3.2

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	46	10	10	18	17	17	16	18	33	18	15	23	13
Percentage of UnrecognizedTaxBenefits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

Period End	2020-12-31	2019-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	203	60	-25.711	-13.326	15	15
Percentage of DeferredTaxAssetsValuationAllowance	100.0	100.0	100.0	100.0	100.0	100.0

cnk:AchievedPercentageOfIrr us-gaap:AwardType, us-gaap:PlanName

cnk:AchievedPercentageOfIrr

us-gaap:RestrictedStockUnitsRSU, cnk:StockGrantsTwentyEightteen

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	-0.6	8.514	0	0.086
Percentage of AchievedPercentageOfIrr	100.0	100.0	0.0	100.0

us-gaap:RestrictedStockUnitsRSU, cnk:StockGrantsTwentySeventeen

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	9.207	0	0.093	0	0	0	0.093
Percentage of AchievedPercentageOfIrr	108.1	0.0	108.1	0.0	0.0	0.0	0.0

cnk:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	-11.821	-91.95	-97.474	-127.999	-117.618	66	178	169	244	152	198	168	221	193	187	153	170	211	168	184	168	184	174	159	194	154
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	-12.34	-14.953	-16.44	-22.232	-21.366	10	16	37	49	26	26	35	33	37	32	44	41	47	28	47	40	41	30	46	49	40
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization	104.4	16.3	16.9	17.4	18.2	15.3	9.3	22.0	20.2	17.4	13.3	21.2	15.0	19.4	17.2	29.2	24.2	22.3	17.1	25.6	24.1	22.2	17.4	29.0	25.6	25.9

us-gaap:OperatingSegments, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	0.519	-76.997	-81.034	-105.767	-96.252	56	161	132	195	125	171	132	188	155	155	108	129	164	139	137	127	143	144	113	144	114
Percentage of AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization	-4.4	83.7	83.1	82.6	81.8	84.7	90.7	78.0	79.8	82.6	86.7	78.8	85.0	80.6	82.8	70.8	75.8	77.7	82.9	74.4	75.9	77.8	82.6	71.0	74.4	74.1

cnk:AdjustmentToAccruedDividendsOnUnvestedRestrictedStockUnitAwardsRelatedToForfeitures

Period End	2021-06-30
Value	-4000.0
Percentage of AdjustmentToAccruedDividendsOnUnvestedRestrictedStockUnitAwardsRelatedToForfeitures	100.0

cnk:AdjustmentToAccruedDividendsOnUnvestedRestrictedStockUnitAwardsRelatedToForfeitures us-gaap:StatementEquityComponents

us-gaap:Parent

Period End	2021-06-30
Value	-4000.0
Percentage of AdjustmentToAccruedDividendsOnUnvestedRestrictedStockUnitAwardsRelatedToForfeitures	100.0

us-gaap:RetainedEarnings

Period End	2021-06-30
Value	-4000.0
Percentage of AdjustmentToAccruedDividendsOnUnvestedRestrictedStockUnitAwardsRelatedToForfeitures	100.0

cnk:AmortizationOfNCMScreenAdvertisingAdvancesAndOtherDeferredRevenues

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	8.16	7.934	7.943	7.852
Percentage of AmortizationOfNCMScreenAdvertisingAdvancesAndOtherDeferredRevenues	100.0	100.0	100.0	100.0

cnk:AmortizationOfNCMScreenAdvertisingAdvancesAndOtherDeferredRevenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	8.032	7.852	7.943	7.852	1.462	4.183	3.999	4.021
Percentage of AmortizationOfNCMScreenAdvertisingAdvancesAndOtherDeferredRevenues	0.0	0.0	100.0	100.0	0.0	0.0	0.0	0.0

cnk:AmortizationOtherComprehensiveLossAmendedSwaps

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30
Value	1123000.0	1124000.0	2669000.0	2669000.0
Percentage of AmortizationOtherComprehensiveLossAmendedSwaps	100.0	100.0	100.0	100.0

cnk:AmortizationOtherComprehensiveLossAmendedSwaps us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30
Value	1123000.0	1124000.0	2669000.0	2669000.0
Percentage of AmortizationOtherComprehensiveLossAmendedSwaps	100.0	100.0	100.0	100.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30
Value	1123000.0	1124000.0	2669000.0	2669000.0
Percentage of AmortizationOtherComprehensiveLossAmendedSwaps	100.0	100.0	100.0	100.0

cnk:AmountDepositedToSupportIssuanceOfBankLetterOfCredit

Period End	2021-06-30	2021-03-31
Value	0.0	7.3
Percentage of AmountDepositedToSupportIssuanceOfBankLetterOfCredit	0.0	100.0

cnk:AmountDepositedToSupportIssuanceOfBankLetterOfCredit us-gaap:LineOfCreditFacility

cnk:OutstandingInternationalLoans

Period End	2021-06-30	2021-03-31
Value	0.0	21
Percentage of AmountDepositedToSupportIssuanceOfBankLetterOfCredit	0.0	289.7

cnk:AmountOfTenderOfferAtExpiration us-gaap:DebtInstrument

cnk:AmountOfTenderOfferAtExpiration

cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-03-16
Value	0.33399
Percentage of AmountOfTenderOfferAtExpiration	100.0

cnk:FourPointEightSevenFivePercentSeniorNotes

Period End	2021-05-21
Value	755
Percentage of AmountOfTenderOfferAtExpiration	0.0

cnk:AmountPaidForUseOfAircraft us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:AmountPaidForUseOfAircraft

cnk:CopperBeechCapitalLLC

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	0	0	0	0	0	12000.0	3000.0	44000.0	60000.0	7000.0	17000.0	0	37000.0	14000.0	42000.0	26000.0	48000.0	15000.0	16000.0	15000.0	55000.0	24000.0	3000.0	214000.0	156000.0	37000.0
Percentage of AmountPaidForUseOfAircraft	0.0	0.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:AmountsPaidForRestructuringCharges us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:AmountsPaidForRestructuringCharges

cnk:EmployeeRelated, cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	-6701000.0	-90000.0
Percentage of AmountsPaidForRestructuringCharges	100.0	100.0

cnk:EmployeeRelated, cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30
Value	-180000.0
Percentage of AmountsPaidForRestructuringCharges	2.7

cnk:EmployeeRelated, cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-6521000.0	-90000.0
Percentage of AmountsPaidForRestructuringCharges	97.3	100.0

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	-749000.0	-524000.0
Percentage of AmountsPaidForRestructuringCharges	11.2	582.2

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-313000.0	-42000.0
Percentage of AmountsPaidForRestructuringCharges	4.7	46.7

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-436000.0	-482000.0
Percentage of AmountsPaidForRestructuringCharges	6.5	535.6

cnk:AmountsPaidForRestructuringCharges us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments

cnk:EmployeeRelated, cnk:Consolidated

Period End	2021-03-31
Value	-350000.0
Percentage of AmountsPaidForRestructuringCharges	0.0

cnk:EmployeeRelated, cnk:UsOperatingSegment

Period End	2021-03-31
Value	-350000.0
Percentage of AmountsPaidForRestructuringCharges	0.0

cnk:FacilityClosureCosts, cnk:Consolidated

Period End	2021-06-30
Value	-200000.0
Percentage of AmountsPaidForRestructuringCharges	0.0

cnk:FacilityClosureCosts, cnk:UsOperatingSegment

Period End	2021-06-30
Value	-200000.0
Percentage of AmountsPaidForRestructuringCharges	0.0

cnk:AmountsPaidForRestructuringCharges us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	-7450000.0	-614000.0
Percentage of AmountsPaidForRestructuringCharges	111.2	682.2

cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-493000.0	-42000.0
Percentage of AmountsPaidForRestructuringCharges	7.4	46.7

cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-6957000.0	-572000.0
Percentage of AmountsPaidForRestructuringCharges	103.8	635.6

cnk:AmountsPaidForRestructuringCharges us-gaap:StatementBusinessSegments

cnk:Consolidated

Period End	2021-06-30	2021-03-31
Value	-200000.0	-350000.0
Percentage of AmountsPaidForRestructuringCharges	0.0	0.0

cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31
Value	-200000.0	-350000.0
Percentage of AmountsPaidForRestructuringCharges	0.0	0.0

cnk:AmountsRecognizedAsAccountsReceivable

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	0.093	0.127	-0.359	1.793	1.354	2.581	-2.905	7.184	5.907	-6.772	2.344	2.23	9.119
Percentage of AmountsRecognizedAsAccountsReceivable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:AmountsRecognizedAsAccountsReceivable us-gaap:InvestmentType

cnk:OtherDeferredRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	2.9	0.093	0.127	-0.359	1.793	1.354	2.581
Percentage of AmountsRecognizedAsAccountsReceivable	0.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:CallOptionsPurchasedNetOfAdjustments

Period End	2020-09-30
Value	-142090000.0
Percentage of CallOptionsPurchasedNetOfAdjustments	100.0

cnk:CallOptionsPurchasedNetOfAdjustments us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30
Value	-142090000.0
Percentage of CallOptionsPurchasedNetOfAdjustments	100.0

us-gaap:Parent

Period End	2020-09-30
Value	-142090000.0
Percentage of CallOptionsPurchasedNetOfAdjustments	100.0

cnk:CashDistributionsReceivedFromCompanyOne us-gaap:InvestmentType

cnk:CashDistributionsReceivedFromCompanyOne

cnk:CashReceived

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	-3.207	3.207	2.145	15
Percentage of CashDistributionsReceivedFromCompanyOne	100.0	100.0	100.0	100.0

cnk:DistributionsFromNcm

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	1.061	-1.061	-0.69	-5.224	-3.622
Percentage of CashDistributionsReceivedFromCompanyOne	-33.1	-33.1	-32.2	-33.1	0.0

cnk:InvestmentInNcm

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	2.146	-2.146	-1.455	-10.567	-7.326
Percentage of CashDistributionsReceivedFromCompanyOne	-66.9	-66.9	-67.8	-66.9	0.0

cnk:CashPaymentsMadeToRelatedPartyForLeasedProperties us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:CashPaymentsMadeToRelatedPartyForLeasedProperties

cnk:SyufyEnterprisesLp

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	6.009	6.033	6.539	6.729	6.477	4.065	5.672	5.65	7.766	6.59	3.982	6.485	5.1	7.88	3.639	5.424	6.094	7.326	3.318	5.412	5.537	6.857	3.873	5.672	5.47	5.566	3.724	5.673	5.878	5.765	5.333	5.83	5.904	5.809
Percentage of CashPaymentsMadeToRelatedPartyForLeasedProperties	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:CashReceivedFromCustomersInAdvance

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	8.024	10	1.376	-0.313	44	88	50	47	40	75	27	31	22
Percentage of CashReceivedFromCustomersInAdvance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:CashReceivedFromCustomersInAdvance us-gaap:InvestmentType

cnk:OtherDeferredRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	13	8.024	10	1.376	-0.313	44	88
Percentage of CashReceivedFromCustomersInAdvance	0.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ChangeInAccountsPayableForAcquisitionOfTheatreProperties

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	3.419	-6.955	-5.326	-8.976	-1.226	2.269	35	2.476	-1.458	-14.66	-12.778	4.152	-4.727	7.625	15	-0.988	12	-17.189	-29.603	-11.23	8.307	3.055	3.563	3.629	-7.085	2.384	2.159	3.683	-0.825	-3.792	1.388	2.715	5.272	-2.05	-3.884	-0.005	-0.227	-9.711	6.211	2.383	0.221	-1.466	1.591	1.651
Percentage of ChangeInAccountsPayableForAcquisitionOfTheatreProperties	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:CompanyOwnershipPercentageOfSubsidiary us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:CompanyOwnershipPercentageOfSubsidiary

cnk:LaredoTheatreLtd

Period End	2021-06-30	2021-03-31	2020-12-31
Value	0	75.0	0
Percentage of CompanyOwnershipPercentageOfSubsidiary	0.0	100.0	0.0

cnk:ConcessionSuppliesExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	18	7.14	8.768	2.688	2.379	34	49	51	62	43	46	42	51	40	42	40	41
Percentage of ConcessionSuppliesExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:CostOfOnScreenTimeProvidedToBeverageConcessionaire

Period End	2021-06-30	2021-03-31	2020-12-31
Value	1.029	0.37	0.362
Percentage of CostOfOnScreenTimeProvidedToBeverageConcessionaire	100.0	100.0	100.0

cnk:CostOfSharesWithheldByCompanyToCoverTaxWithholdingsRelatedToRestrictedStockVesting

Period End	2021-06-30	2021-03-31	2020-12-31
Value	4000.0	8000.0	2572000.0
Percentage of CostOfSharesWithheldByCompanyToCoverTaxWithholdingsRelatedToRestrictedStockVesting	100.0	100.0	100.0

cnk:DebtInstrumentIssueDiscount us-gaap:DebtInstrument

cnk:DebtInstrumentIssueDiscount

cnk:FivePointEightSevenFivePercentSeniorNote

Period End	2021-03-16
Value	101.0
Percentage of DebtInstrumentIssueDiscount	100.0

cnk:FivePointTwoFiveZeroPercentSeniorNote

Period End	2021-06-15
Value	101.0
Percentage of DebtInstrumentIssueDiscount	0.0

cnk:DistributionsFromCompanyOne us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:DistributionsFromCompanyOne

cnk:Ncm

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	0.0	0.077	0.0	1.061	0.69	5.224	3.705	2.474	2.146	4.548	3.221	2.386	3.424	6.358	4.703	2.144	2.772	6.788
Percentage of DistributionsFromCompanyOne	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:DividendsAccruedOnUnvestedRestrictedStockUnitAwards

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-4000.0	2000.0	-1000.0	1000.0	0	256000.0	184000.0	189000.0	189000.0	108000.0	208000.0	145000.0	146000.0	125000.0	135000.0	135000.0	135000.0	153000.0	194000.0	96000.0	85000.0	179000.0	295000.0	98000.0	99000.0	101000.0	153000.0	103000.0	103000.0	171000.0	298000.0	164000.0	133000.0	177000.0	434000.0	150000.0	151000.0	159000.0	175000.0	843000.0	-494000.0	160000.0	371000.0	426000.0
Percentage of DividendsAccruedOnUnvestedRestrictedStockUnitAwards	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:DividendsAccruedOnUnvestedRestrictedStockUnitAwards us-gaap:StatementEquityComponents

us-gaap:Parent

Period End	2021-03-31	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	2000.0	256000.0	189000.0	189000.0	108000.0	208000.0	145000.0	146000.0	125000.0	135000.0	135000.0	135000.0	153000.0	194000.0	96000.0	85000.0	179000.0	295000.0	98000.0	99000.0	101000.0	153000.0	103000.0	103000.0	171000.0	298000.0	164000.0	133000.0	177000.0	434000.0	150000.0	151000.0	159000.0	175000.0	843000.0	-494000.0	160000.0	371000.0	426000.0
Percentage of DividendsAccruedOnUnvestedRestrictedStockUnitAwards	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RetainedEarnings

Period End	2021-03-31	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	2000.0	256000.0	189000.0	189000.0	108000.0	145000.0	146000.0	125000.0
Percentage of DividendsAccruedOnUnvestedRestrictedStockUnitAwards	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:EquipmentLeaseExpense us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:EquipmentLeaseExpense

cnk:DigitalCinemaImplementationPartners

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31
Value	1045000.0	345000.0	346000.0	0	1038000.0	1042000.0	1105000.0	1131000.0	1121000.0	1173000.0	1229000.0	1243000.0	1217000.0	1410000.0	1452000.0	1511000.0	1369000.0	1353000.0	1333000.0	1406000.0	1125000.0	1341000.0	1084000.0	1039000.0	1010000.0	1007000.0	1005000.0	999000.0	1001000.0	1005000.0
Percentage of EquipmentLeaseExpense	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	19	3.98	-33.269	-29.878	-37.305	-5.239	26	22	30	20	27	25	25	23	26	22	29
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:EquityReclassifiedToLongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:BalanceSheetLocation

cnk:EquityReclassifiedToLongTermDebt

cnk:AccountingStandardsUpdate202006, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31
Value	0	3764000.0
Percentage of EquityReclassifiedToLongTermDebt	0.0	100.0

cnk:EventsFeesPaidToJointVenture us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:IncomeStatementLocation

cnk:EventsFeesPaidToJointVenture

cnk:ACJVLLC, cnk:FilmRentalsAndAdvertising

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30
Value	0.357	0.23	1.482	0.0	0.585	1.673	5.044	1.857	3.158	5.317	3.965	2.928	3.017	2.571	4.502	2.685
Percentage of EventsFeesPaidToJointVenture	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ExamplePercentageOfIRRForProRatioCalculation us-gaap:AwardType

cnk:ExamplePercentageOfIRRForProRatioCalculation

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31
Value	-2.0
Percentage of ExamplePercentageOfIRRForProRatioCalculation	100.0

cnk:FacilityLeaseExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	67	64	65	67	65	82	83	87	89	85	79	80	81	82	79	81	82	84	79	82	80	78	77	80	82	79	77	80	80	78	77	85	76	69	68	72	71	68
Percentage of FacilityLeaseExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:FeesPaidRelatedToDebtRefinancing

Period End	2021-06-30	2021-03-31
Value	623000.0	1435000.0
Percentage of FeesPaidRelatedToDebtRefinancing	100.0	100.0

cnk:FilmRentalsAndAdvertising

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	76	23	21	8.257	0.388	156	244	254	294	210	241	230	287	240	240	226	246	252	229	249	250	232	239	236	285	215	217	215	249	200	227	254	257	179	208	214	227	195	185	225	222	165	186	200	193	188
Percentage of FilmRentalsAndAdvertising	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:FinanceLeaseCost

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	4.632	4.82	5.291	5.39	5.437	5.558	5.411	5.625	5.723	5.761
Percentage of FinanceLeaseCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ForeignCurrencyTranslationAdjustments

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-1071000.0	364000.0	-275000.0	-152000.0	-1595000.0	147000.0	-1060000.0	57000.0	-318000.0	63000.0	-779000.0	-1614000.0	-75000.0
Percentage of ForeignCurrencyTranslationAdjustments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ForeignCurrencyTranslationAdjustments us-gaap:InvestmentType

cnk:OtherDeferredRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	1015000.0	-1071000.0	364000.0	-275000.0	-152000.0	-1595000.0	147000.0
Percentage of ForeignCurrencyTranslationAdjustments	0.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ForeignCurrencyTranslationAdjustmentsAndOtherFiniteLivedIntangibleAssetsGrossCarryingAmount

Period End	2021-06-30	2021-03-31	2020-12-31
Value	414000.0	-297000.0	-503000.0
Percentage of ForeignCurrencyTranslationAdjustmentsAndOtherFiniteLivedIntangibleAssetsGrossCarryingAmount	100.0	100.0	100.0

cnk:ForeignCurrencyTranslationAdjustmentsAndOtherIndefiniteLivedIntangibleAssets

Period End	2021-03-31	2020-12-31
Value	-158000.0	106000.0
Percentage of ForeignCurrencyTranslationAdjustmentsAndOtherIndefiniteLivedIntangibleAssets	100.0	100.0

cnk:ForeignCurrencyTranslationAdjustmentsAndOtherIntangibleAssetsNetExcludingGoodwill

Period End	2021-06-30	2021-03-31	2020-12-31
Value	572000.0	-455000.0	-197000.0
Percentage of ForeignCurrencyTranslationAdjustmentsAndOtherIntangibleAssetsNetExcludingGoodwill	100.0	100.0	100.0

cnk:ForfeitureRateForRestrictedStockAwardsGrantsInPeriod us-gaap:Range, us-gaap:AwardType

cnk:ForfeitureRateForRestrictedStockAwardsGrantsInPeriod

srt:Maximum, us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31	2018-09-30
Value	0	10.0	0	9.9	0	0.1	0	0	0	0
Percentage of ForfeitureRateForRestrictedStockAwardsGrantsInPeriod	0.0	100.0	0.0	100.0	0.0	100.0	0.0	0.0	0.0	0.0

cnk:GainLossOnDisposalOfAssetsAndOther

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-2.358	-4.505	-2.074	13	-0.425	-1.905	-3.951	-2.453	-1.805	-3.799
Percentage of GainLossOnDisposalOfAssetsAndOther	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:GainLossOnSaleOfAssetsAndOther

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30
Value	-2.358	-4.505	-2.074	13	-0.425	-1.905	-3.951	-2.453	-1.805	-3.799	-10.036	-7.826	-16.901	-3.939	-13.348	-8.576	-0.054	-0.834	-9.474	-6.94	-5.824	1.779	-4.291	0.5	-5.802	1.45	-6.996	-2.59	-3.276	-2.853	1.313	-0.611	2.801	0.342	-4.164	-6.699
Percentage of GainLossOnSaleOfAssetsAndOther	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ImpactOfForeignCurrencyTranslationAndOtherOnNetCarryingAmountFiniteLivedIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31
Value	414000.0	-297000.0	-303000.0
Percentage of ImpactOfForeignCurrencyTranslationAndOtherOnNetCarryingAmountFiniteLivedIntangibleAssets	100.0	100.0	100.0

cnk:IncreaseDecreaseInNoncashWriteOffs us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:IncreaseDecreaseInNoncashWriteOffs

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	-82000.0	-2286000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	100.0	100.0

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-129000.0	-2374000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	157.3	103.8

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	47000.0	88000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	-57.3	-3.8

cnk:IncreaseDecreaseInNoncashWriteOffs us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	-82000.0	-2286000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	100.0	100.0

cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	-129000.0	-2374000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	157.3	103.8

cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	47000.0	88000.0
Percentage of IncreaseDecreaseInNoncashWriteOffs	-57.3	-3.8

cnk:InterestAccruedRelatedToSignificantFinancingComponent

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	-5.835	-5.869	-5.901	-5.934	-5.891
Percentage of InterestAccruedRelatedToSignificantFinancingComponent	100.0	100.0	100.0	100.0	100.0

cnk:InterestAccruedRelatedToSignificantFinancingComponent us-gaap:InvestmentType

cnk:InterestExpenseNcm

Period End	2021-06-30	2021-03-31
Value	5.962	5.835
Percentage of InterestAccruedRelatedToSignificantFinancingComponent	0.0	-100.0

cnk:NCMScreenAdvertisingAdvances

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	-5.962	-5.835	-5.869	-5.901	-5.934	-5.891
Percentage of InterestAccruedRelatedToSignificantFinancingComponent	0.0	100.0	100.0	100.0	100.0	100.0

cnk:InterestAccruedRelatedToSignificantFinancingComponent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	5.962	5.835	5.869	5.901	5.934	5.891
Percentage of InterestAccruedRelatedToSignificantFinancingComponent	0.0	-100.0	-100.0	-100.0	-100.0	-100.0

cnk:InternationalLoanProceedsReceived

Period End	2021-06-30	2021-03-31
Value	0	9012000.0
Percentage of InternationalLoanProceedsReceived	0.0	100.0

cnk:LeaseTerminationLiability us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:BalanceSheetLocation

cnk:LeaseTerminationLiability

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherCurrentLiabilities

Period End	2021-06-30	2021-03-31
Value	-1043000.0	2084000.0
Percentage of LeaseTerminationLiability	100.0	100.0

cnk:LoanAmounts us-gaap:StatementGeographical

cnk:LoanAmounts

cnk:BrazilLoan

Period End	2021-06-30	2021-03-31
Value	0.0	5.735
Percentage of LoanAmounts	0.0	100.0

cnk:PeruLoan

Period End	2021-06-30	2021-03-31
Value	0.0	3.277
Percentage of LoanAmounts	0.0	57.1

cnk:ManagementFeeRevenues us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:ManagementFeeRevenues

cnk:LaredoTheatreLtd

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30
Value	92000.0	24000.0	23000.0	9000.0	52000.0	62000.0	155000.0	175000.0	218000.0	146000.0	166000.0	161000.0	186000.0	141000.0	135000.0	146000.0
Percentage of ManagementFeeRevenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ManagementFeeRevenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:FEConceptsLLC

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	15000.0	9000.0	0	10000.0
Percentage of ManagementFeeRevenues	65.2	100.0	0.0	16.1

cnk:NonCashAccretionOnConvertibleNotes

Period End	2020-12-31
Value	3975000.0
Percentage of NonCashAccretionOnConvertibleNotes	100.0

cnk:NonCashInterestAccruedRelatedToNCMScreenAdvertisingAdvances us-gaap:InvestmentType

cnk:NonCashInterestAccruedRelatedToNCMScreenAdvertisingAdvances

cnk:InterestExpenseNcm

Period End	2020-09-30	2020-06-30	2020-03-31
Value	5.901	5.934	5.891
Percentage of NonCashInterestAccruedRelatedToNCMScreenAdvertisingAdvances	100.0	100.0	100.0

cnk:NCMScreenAdvertisingAdvances

Period End	2020-09-30	2020-06-30	2020-03-31
Value	-5.901	-5.934	-5.891
Percentage of NonCashInterestAccruedRelatedToNCMScreenAdvertisingAdvances	-100.0	-100.0	-100.0

cnk:NonCashInterestExpenseDueToSignificantFinancingComponent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:NonCashInterestExpenseDueToSignificantFinancingComponent

cnk:Ncm

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	5.962	5.835	5.869	5.901	5.934	5.891	14	4.666	4.732	4.782	4.849	4.983	4.913	4.979
Percentage of NonCashInterestExpenseDueToSignificantFinancingComponent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:NonCashRentExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	807000.0	-128000.0	-708000.0	-816000.0	-1424000.0	591000.0	1108000.0	1102000.0	1331000.0	819000.0
Percentage of NonCashRentExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:NoncashReserveAdjustments us-gaap:RestructuringCostAndReserve, us-gaap:StatementBusinessSegments

cnk:NoncashReserveAdjustments

cnk:EmployeeRelated, cnk:Consolidated

Period End	2021-06-30
Value	-60000.0
Percentage of NoncashReserveAdjustments	100.0

cnk:EmployeeRelated, cnk:UsOperatingSegment

Period End	2021-06-30
Value	-60000.0
Percentage of NoncashReserveAdjustments	100.0

cnk:FacilityClosureCosts, cnk:Consolidated

Period End	2021-06-30	2021-03-31
Value	-680000.0	-208000.0
Percentage of NoncashReserveAdjustments	1133.3	0.0

cnk:FacilityClosureCosts, cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31
Value	-680000.0	-208000.0
Percentage of NoncashReserveAdjustments	1133.3	0.0

cnk:NoncashReserveAdjustments us-gaap:StatementBusinessSegments

cnk:Consolidated

Period End	2021-06-30	2021-03-31
Value	-740000.0	-208000.0
Percentage of NoncashReserveAdjustments	1233.3	0.0

cnk:UsOperatingSegment

Period End	2021-06-30	2021-03-31
Value	-740000.0	-208000.0
Percentage of NoncashReserveAdjustments	1233.3	0.0

cnk:OffsettingAmortizationOfDebtIssueCostsAsAdjustmentToRetainedEarnings us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:BalanceSheetLocation

cnk:OffsettingAmortizationOfDebtIssueCostsAsAdjustmentToRetainedEarnings

cnk:AccountingStandardsUpdate202006, us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31
Value	0	274000.0
Percentage of OffsettingAmortizationOfDebtIssueCostsAsAdjustmentToRetainedEarnings	0.0	100.0

cnk:OtherIncreasesDecreasesInInvestments us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:OtherIncreasesDecreasesInInvestments

us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31
Value	-0.26	0.664	0.108	-2.59	0.03	0.026	-0.397	-0.689	-0.081	-0.029	-1.397	-0.22	0.155	-1.216	0.11	-0.036	0.031	-0.16	0.433	0.309	-0.22	-0.001	0.472
Percentage of OtherIncreasesDecreasesInInvestments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:OtherIncreasesDecreasesInInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30
Value	0.0	0.0	0.05	0.0	0.0	0.0	0.0
Percentage of OtherIncreasesDecreasesInInvestments	-0.0	0.0	192.3	-0.0	-0.0	-0.0	-0.0

cnk:OtherInvestment, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-0.26	0.664	0.158	-2.59	0.03	-0.024	-0.397	-0.689	-0.081	-0.029	-0.128	-0.22
Percentage of OtherIncreasesDecreasesInInvestments	100.0	100.0	146.3	100.0	100.0	-92.3	100.0	100.0	100.0	100.0	9.2	100.0

cnk:PaymentsToEquityInvesteeForServices us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:PaymentsToEquityInvesteeForServices

cnk:DigitalCinemaDistributionCoalition

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	147000.0	64000.0	220000.0	0	103000.0	105000.0	193000.0	195000.0	245000.0	263000.0	270000.0	196000.0	227000.0	234000.0	211000.0	191000.0	168000.0	278000.0	232000.0	242000.0	265000.0	152000.0	182000.0	208000.0	152000.0	207000.0	181000.0	201000.0
Percentage of PaymentsToEquityInvesteeForServices	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:PaymentsToJointVentureInvestmentAndOtherNet

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2018-12-31	2018-09-30	2017-12-31	2017-09-30
Value	0.0	0.0	0.0	0.05	-0.907	0.975	2.537	0.712
Percentage of PaymentsToJointVentureInvestmentAndOtherNet	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0

cnk:PercentOfCommonStockHeldByChairman us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:PercentOfCommonStockHeldByChairman

cnk:LaredoTheatreLtd

Period End	2021-06-30	2021-03-31	2020-12-31
Value	0	8.0	0
Percentage of PercentOfCommonStockHeldByChairman	0.0	100.0	0.0

cnk:PercentOfOutstandingPrincipalAsRedemptionPrice us-gaap:DebtInstrument

cnk:PercentOfOutstandingPrincipalAsRedemptionPrice

cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-03-16
Value	100.0
Percentage of PercentOfOutstandingPrincipalAsRedemptionPrice	100.0

cnk:FourPointEightSevenFivePercentSeniorNotes

Period End	2021-05-21
Value	100.0
Percentage of PercentOfOutstandingPrincipalAsRedemptionPrice	0.0

cnk:PercentageOfInterestHeldByCoPartner us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:PercentageOfInterestHeldByCoPartner

cnk:LaredoTheatreLtd

Period End	2021-06-30	2021-03-31	2020-12-31
Value	0	25.0	0
Percentage of PercentageOfInterestHeldByCoPartner	0.0	100.0	0.0

cnk:PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionOne us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionOne

cnk:LaredoTheatreLtd

Period End	2021-06-30	2021-03-31	2020-12-31
Value	0	5.0	0
Percentage of PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionOne	0.0	100.0	0.0

cnk:PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionTwo us-gaap:RelatedPartyTransactionsByRelatedParty

cnk:PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionTwo

cnk:LaredoTheatreLtd

Period End	2020-12-31
Value	0
Percentage of PercentageOfManagementFeesBasedOnTheatreRevenueUnderConditionTwo	0.0

cnk:PercentageOfVariableMarginRateAddedToColombianRate

Period End	2020-09-30	2020-05-31
Value	0.5	7.5
Percentage of PercentageOfVariableMarginRateAddedToColombianRate	100.0	100.0

cnk:ProceedsFromRedemptionOfSeniorNotes

Period End	2021-06-30	2021-03-31
Value	-755000000.0	-400000000.0
Percentage of ProceedsFromRedemptionOfSeniorNotes	100.0	100.0

cnk:ReceiptUnderTaxReceivableAgreementWithCompanyOne us-gaap:InvestmentType

cnk:ReceiptUnderTaxReceivableAgreementWithCompanyOne

cnk:CashReceived

Period End	2021-06-30	2021-03-31
Value	0	233000.0
Percentage of ReceiptUnderTaxReceivableAgreementWithCompanyOne	0.0	100.0

cnk:DistributionsFromNcm

Period End	2021-06-30	2021-03-31	2019-12-31
Value	0	-77000.0	-83000.0
Percentage of ReceiptUnderTaxReceivableAgreementWithCompanyOne	0.0	-33.0	0.0

cnk:InvestmentInNcm

Period End	2021-06-30	2021-03-31	2019-12-31
Value	0	-156000.0	-168000.0
Percentage of ReceiptUnderTaxReceivableAgreementWithCompanyOne	0.0	-67.0	0.0

cnk:ReclassifiedCashConversionFeatureEquityToLongTermDebt us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:BalanceSheetLocation

cnk:ReclassifiedCashConversionFeatureEquityToLongTermDebt

cnk:AccountingStandardsUpdate202006, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31
Value	0.0	101
Percentage of ReclassifiedCashConversionFeatureEquityToLongTermDebt	0.0	100.0

cnk:RecognizedIncrementalScreenRentalRevenueAndOffsettingInterestExpense us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:RecognizedIncrementalScreenRentalRevenueAndOffsettingInterestExpense

cnk:Ncm

Period End	2021-06-30	2021-03-31
Value	5.962	5.835
Percentage of RecognizedIncrementalScreenRentalRevenueAndOffsettingInterestExpense	100.0	100.0

cnk:RemainingPrincipalAmountAfterOptionalRedemption us-gaap:DebtInstrument

cnk:RemainingPrincipalAmountAfterOptionalRedemption

cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-03-16
Value	0.06601
Percentage of RemainingPrincipalAmountAfterOptionalRedemption	100.0

cnk:FourPointEightSevenFivePercentSeniorNotes

Period End	2021-05-21
Value	755
Percentage of RemainingPrincipalAmountAfterOptionalRedemption	0.0

cnk:ReversedAccretionOfInterestToRetainedEarnings us-gaap:AdjustmentsForNewAccountingPronouncements

cnk:ReversedAccretionOfInterestToRetainedEarnings

cnk:AccountingStandardsUpdate202006

Period End	2021-06-30	2021-03-31
Value	0	5714000.0
Percentage of ReversedAccretionOfInterestToRetainedEarnings	0.0	100.0

cnk:ScreenAdvertisingAdvancesAmortizedToOtherRevenue us-gaap:InvestmentType

cnk:ScreenAdvertisingAdvancesAmortizedToOtherRevenue

cnk:NCMScreenAdvertisingAdvances

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	8.077	7.85	7.851	7.851	7.851	7.761
Percentage of ScreenAdvertisingAdvancesAmortizedToOtherRevenue	100.0	100.0	100.0	100.0	100.0	100.0

cnk:OtherRevenue

Period End	2021-06-30	2021-03-31
Value	-8.077	-7.85
Percentage of ScreenAdvertisingAdvancesAmortizedToOtherRevenue	-100.0	-100.0

cnk:ScreenAdvertisingAdvancesAmortizedToOtherRevenue us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Period End	2021-06-30	2021-03-31	2020-09-30
Value	8.076	7.851	7.851
Percentage of ScreenAdvertisingAdvancesAmortizedToOtherRevenue	100.0	100.0	100.0

cnk:ScreenRentalRevenuesEarnedUnderExhibitorServicesAgreement us-gaap:InvestmentType

cnk:ScreenRentalRevenuesEarnedUnderExhibitorServicesAgreement

cnk:CashReceived

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	2935000.0	855000.0	745000.0	3000.0	3461000.0
Percentage of ScreenRentalRevenuesEarnedUnderExhibitorServicesAgreement	100.0	100.0	100.0	100.0	100.0

cnk:OtherRevenue

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	-2935000.0	-855000.0	-745000.0	-3000.0	-3461000.0
Percentage of ScreenRentalRevenuesEarnedUnderExhibitorServicesAgreement	-100.0	-100.0	-100.0	-100.0	-100.0

cnk:ServicesFeeToAffiliate us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:ServicesFeeToAffiliate

cnk:DigitalCinemaImplementationPartners

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30
Value	4000.0	11000.0	124000.0	0	0	84000.0	158000.0	128000.0	152000.0	158000.0	172000.0	180000.0	184000.0	194000.0	204000.0	207000.0	206000.0	206000.0	206000.0	207000.0	206000.0	206000.0	206000.0	205000.0	207000.0
Percentage of ServicesFeeToAffiliate	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	0.0	0.0	0.0	3.62	0.0	0.0	0.0	1.552	0.0	0.0	0.0	5.012
Percentage of ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0

cnk:ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment us-gaap:InvestmentType

cnk:InvestmentInNcm

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	0.0	0.0	0.0	3.62	0.0
Percentage of ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment	0.0	0.0	0.0	100.0	0.0

cnk:NCMScreenAdvertisingAdvances

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	0.0	0.0	0.0	-3.62	0.0
Percentage of ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment	0.0	0.0	0.0	-100.0	0.0

cnk:ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentType

cnk:Ncm, cnk:NCMScreenAdvertisingAdvances

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	0.0	0.0	0.0	3.62	0.0
Percentage of ValueOfCommonUnitsReceivedDueToAnnualCommonUnitAdjustment	0.0	0.0	0.0	100.0	0.0

cnk:ValueOfCommonUnitsReceivedFromCompanyOne

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-05-31	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	0.0	0.0	0.0	3.62	0.0	0.0	0.0	1.552	0.0	0.0	0.0	5.012	0.0	0.0	0.0	18	0.0	0.0	0.0	11	0.0	0.0	0.0	15	0.0	0.0	0.0	8.216	0.0	0.0	89	89	8.869	0.0	18	-18.274	9.137	0.0	0.0	0.0	9.302	0.0	0.0
Percentage of ValueOfCommonUnitsReceivedFromCompanyOne	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0

cnk:VariableLeasePaymentsCreditsNet us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

cnk:VariableLeasePaymentsCreditsNet

cnk:FacilityLeasingExpense, cnk:RealEstateProperty

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	0.401	-2.344	-2.91	12
Percentage of VariableLeasePaymentsCreditsNet	100.0	100.0	100.0	100.0

cnk:WarrantyReimbursementsFromAffiliate us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:WarrantyReimbursementsFromAffiliate

cnk:DigitalCinemaImplementationPartners

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30
Value	0.434	0.266	3.874	0.0	0.0	3.123	2.958	2.953	2.951	2.938	2.891	2.791	2.617	2.501	2.37	2.234	2.023	1.884	1.724	1.608	1.435	1.324	1.205	1.137	1.03
Percentage of WarrantyReimbursementsFromAffiliate	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31
Value	4000.0	8000.0	67000.0	107000.0	2691000.0	300000.0	1947000.0	0	210000.0	2695000.0	22000.0	227000.0	2694000.0	26000.0	1192000.0	5610000.0	22000.0	0	4748000.0	0	0	9776000.0	0	210000.0	3254000.0	0	562000.0	2701000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	0.0	0.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31
Value	4000.0	8000.0	67000.0	107000.0	2691000.0	300000.0	1947000.0	0	210000.0	2695000.0	22000.0	227000.0	2694000.0	26000.0	1192000.0	5610000.0	22000.0	0	4748000.0	0	0	9776000.0	0	210000.0	3254000.0	0	562000.0	2701000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	0.0	0.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0

us-gaap:TreasuryStock

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2019-03-31	2018-06-30	2018-03-31
Value	4000.0	8000.0	67000.0	107000.0	2691000.0	300000.0	1947000.0	210000.0	2695000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature

Period End	2020-08-21
Value	10
Percentage of AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt

Period End	2020-09-30
Value	10
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30
Value	10
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100.0

us-gaap:Parent

Period End	2020-09-30
Value	10
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued

Period End	2020-09-30
Value	89
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalWarrantIssued us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30
Value	89
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued	100.0

us-gaap:Parent

Period End	2020-09-30
Value	89
Percentage of AdjustmentsToAdditionalPaidInCapitalWarrantIssued	100.0

us-gaap:AmortizationOfDeferredHedgeGains

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	1123000.0	1124000.0	-1967000.0	2669000.0	2669000.0
Percentage of AmortizationOfDeferredHedgeGains	100.0	100.0	100.0	100.0	100.0

us-gaap:AssetImpairmentCharges

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30
Value	111	24	0.0	16	11	27	12	5.584	27	1.641	2.788	0.591	5.484	5.026	4.301	0.273	0.513	0.406	1.425	0.492	3.846	0.633	3.528
Percentage of AssetImpairmentCharges	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AssetImpairmentCharges us-gaap:StatementBusinessSegments

cnk:InternationalOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	6.016	18	0.0	7.024	2.115	0.645	3.403	4.376
Percentage of AssetImpairmentCharges	5.4	76.8	0.0	42.3	18.2	2.4	27.2	78.4

cnk:UsOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	105	5.698	0.0	9.595	9.504	26	9.091	1.208
Percentage of AssetImpairmentCharges	94.6	23.2	0.0	57.7	81.8	97.6	72.8	21.6

us-gaap:CapitalExpendituresIncurredButNotYetPaid

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30
Value	3.419	21	28	-8.976	-1.226	17	-8.371	2.476	-1.458	22	-1.322	4.152	10	23	-3.402	-0.988	12	23	29	-11.494	8.307	14	-3.563	-3.629	2.317	15	2.159	3.683	-0.825	8.218	1.388	2.715	1.172	6.735	4.685	-0.005	-0.227	8.801	6.212	2.383
Percentage of CapitalExpendituresIncurredButNotYetPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	21	20	8.948	7.525	51	84	49	56	47	50	33
Percentage of ContractWithCustomerLiabilityRevenueRecognized	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized us-gaap:InvestmentType

cnk:NCMScreenAdvertisingAdvances

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	8.077	7.85	7.851	7.851	7.851	7.761	20
Percentage of ContractWithCustomerLiabilityRevenueRecognized	0.0	37.2	37.8	87.7	104.3	15.0	23.8

cnk:OtherDeferredRevenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	16	13	12	1.097	-0.326	43	64
Percentage of ContractWithCustomerLiabilityRevenueRecognized	0.0	62.8	62.2	12.3	-4.3	85.0	76.2

us-gaap:CostmethodInvestmentsOtherThanTemporaryImpairment us-gaap:StatementBusinessSegments

us-gaap:CostmethodInvestmentsOtherThanTemporaryImpairment

cnk:UsOperatingSegment

Period End	2020-12-31	2020-09-30
Value	0	2500000.0
Percentage of CostmethodInvestmentsOtherThanTemporaryImpairment	0.0	100.0

us-gaap:DebtInstrumentConvertibleConversionRatio1 us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleConversionRatio1

cnk:FourPointFiveZeroConvertibleSeniorNotes

Period End	2020-08-21
Value	69.677
Percentage of DebtInstrumentConvertibleConversionRatio1	100.0

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal

cnk:FourPointFiveZeroConvertibleSeniorNotes

Period End	2021-06-30	2021-03-31
Value	-46.629	279
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal	100.0	100.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal

Period End	2020-09-30	2020-05-31	2011-09-30
Value	1032000.0	2811000.0	0
Percentage of DebtInstrumentPeriodicPaymentPrincipal	100.0	100.0	0.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal us-gaap:DebtInstrument

cnk:SeniorSecuredCreditFacility

Period End	2020-09-30
Value	0
Percentage of DebtInstrumentPeriodicPaymentPrincipal	0.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cnk:SeniorSecuredCreditFacility, cnk:TermLoanCreditFacility

Period End	2021-06-30	2021-03-31
Value	0	1649000.0
Percentage of DebtInstrumentPeriodicPaymentPrincipal	0.0	0.0

us-gaap:DebtRelatedCommitmentFeesAndDebtIssuanceCosts us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtRelatedCommitmentFeesAndDebtIssuanceCosts

cnk:FivePointTwoFivePercentSeniorNotesCreditFacility, cnk:RevolvingCreditLine

Period End	2021-06-30
Value	83000.0
Percentage of DebtRelatedCommitmentFeesAndDebtIssuanceCosts	100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:DeferredIncomeTaxesAndTaxCredits

cnk:AccountingStandardUpdate202006

Period End	2021-03-31
Value	23
Percentage of DeferredIncomeTaxesAndTaxCredits	100.0

us-gaap:Depreciation

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	66	67	67	61	62	64	63	66	63	63	66	64	63	63	61	57	58	56	52	53	51	48	49	46	45	44	43	44	43	41	42	41	37	38	36	35	35	35	33	39	39	38	38	33	33	32
Percentage of Depreciation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DerivativeCostOfHedge us-gaap:DebtInstrument

us-gaap:DerivativeCostOfHedge

cnk:FourPointFiveZeroConvertibleSeniorNotes

Period End	2020-08-21
Value	142
Percentage of DerivativeCostOfHedge	100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	1314000.0	-1620000.0	1083000.0	1534000.0	647000.0	-7183000.0	2540000.0	-5663000.0	257000.0	110000.0	-490000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	165000.0	-110000.0	2942000.0	58000.0	202000.0	2418000.0	43000.0	0	471000.0	1002000.0	-7000.0	0	352000.0	1399000.0	2000.0	32000.0	661000.0	1972000.0	0	101000.0	706000.0	4748000.0	0	35000.0	477000.0	3311000.0	-1484000.0	0	464000.0	6645000.0
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0

us-gaap:RestrictedStockUnitsRSU

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-177000.0	-129000.0	573000.0	-311000.0	-295000.0	821000.0	222000.0	5000.0	0	170000.0	-32000.0	0	17000.0	723000.0	0	0	0	1745000.0	0	0	1056000.0	1993000.0	0	0	0	2303000.0	45000.0	0	0	4751000.0
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-107.3	117.3	19.5	-536.2	-146.0	34.0	516.3	0.0	0.0	17.0	457.1	0.0	4.8	51.7	0.0	0.0	0.0	88.5	0.0	0.0	149.6	42.0	0.0	0.0	0.0	69.6	-3.0	0.0	0.0	71.5

us-gaap:EquityMethodInvestmentDividendsOrDistributions

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	0.0	0.156	0.0	2.146	6.678	16	25	8.498	5.323	14	9.102	4.786	3.932	12	8.652	2.402	2.87	12	12	1.391	0.184	8.086	6.348	4.37	1.045	7.264	7.798	3.022	1.024	7.328	6.013	4.642	0.713	2.29	2.907	1.76	0.145	2.658	2.526	1.764	0.415	2.42	2.194	1.233	0.385	1.674
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

us-gaap:OtherAffiliates

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	0.0	0.0	5.222	6.039	17	3.494	1.0	5.218	2.737	0.0	0.0	5.201	3.403	0.0	0.0	5.212
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	0.0	78.2	36.4	70.3	41.1	18.8	36.4	30.1	0.0	0.0	42.2	39.3	0.0	0.0	43.3

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:DigitalCinemaImplementationPartners

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	0.0	0.0	5.222	5.161	15	2.694	0.0	5.218	0.598
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	0.0	78.2	31.1	62.6	31.7	0.0	36.4	6.6

cnk:OtherInvestees

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	0.0	0.156	0.0	2.146	1.456	11	9.419	5.804	5.323	9.124	8.504	4.786
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	100.0	0.0	100.0	21.8	68.9	37.4	68.3	100.0	63.6	93.4	100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:DigitalCinemaDistributionCoalition, us-gaap:OtherAffiliates

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	0.0	0.0	0.0	0.878	0.206	0.0	0.0	0.0	0.219	0.0
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	0.0	0.0	5.3	0.8	0.0	0.0	0.0	2.4	0.0

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	0.0	0.0	5.222	5.161	15	2.694	0.0	5.218	0.598	0.0
Percentage of EquityMethodInvestmentDividendsOrDistributions	0.0	0.0	78.2	31.1	62.6	31.7	0.0	36.4	6.6	0.0

us-gaap:FinanceLeaseInterestExpense us-gaap:IncomeStatementLocation

us-gaap:FinanceLeaseInterestExpense

us-gaap:InterestExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1491000.0	1570000.0	1681000.0	1725000.0	1757000.0	1851000.0	1859000.0	1922000.0	1984000.0	2021000.0
Percentage of FinanceLeaseInterestExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1490000.0	1566000.0	1681000.0	1725000.0	1768000.0	1811000.0	1820000.0	1863000.0	1919000.0	1974000.0
Percentage of FinanceLeaseInterestPaymentOnLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeasePrincipalPayments

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	3.631	3.742	3.935	3.877	3.831	3.789	3.77	3.699	3.614	3.517
Percentage of FinanceLeasePrincipalPayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization us-gaap:IncomeStatementLocation

us-gaap:FinanceLeaseRightOfUseAssetAmortization

cnk:DepreciationAndAmortization

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	3.141	3.25	3.61	3.665	3.68	3.707	3.552	3.703	3.739	3.74
Percentage of FinanceLeaseRightOfUseAssetAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	2327000.0	-2974000.0	1318000.0	-2251000.0	916000.0	-4848000.0	1391000.0	-4406000.0	-401000.0	22000.0	-4713000.0	-3126000.0	-5199000.0	1378000.0	-1125000.0	584000.0	-155000.0	1589000.0	3572000.0	485000.0	512000.0	1886000.0	1909000.0	-11935000.0	1439000.0	-8206000.0	-5834000.0	-5235000.0	1825000.0	3052000.0	-769000.0	-507000.0	-1670000.0	1330000.0	424000.0	1215000.0	-1418000.0	1865000.0	293000.0	-1858000.0	523000.0	823000.0	292000.0	682000.0	348000.0	-268000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:StatementGeographical

country:AR

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	199000.0	226000.0	190000.0	1686000.0	-339000.0	-294000.0	-7063000.0	3655000.0	95000.0	-394000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax	8.6	-7.6	14.4	-74.9	-37.0	6.1	-507.8	-83.0	-23.7	-1790.9

us-gaap:GainLossOnSaleOfOtherAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-2.358	-4.505	2.074	-13.327	0.425	1.905	3.951	2.453	1.805	3.799
Percentage of GainLossOnSaleOfOtherAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:GoodwillAndIntangibleAssetImpairment us-gaap:StatementBusinessSegments

us-gaap:GoodwillAndIntangibleAssetImpairment

cnk:InternationalOperatingSegment

Period End	2020-12-31	2020-09-30
Value	656000.0	177000.0
Percentage of GoodwillAndIntangibleAssetImpairment	100.0	100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	5955000.0	-4645000.0	4413000.0	-1382000.0	-1622000.0	-14812000.0	2018000.0	-5437000.0	1226000.0	-440000.0	2052000.0	-2594000.0	-14283000.0	-134000.0	-3073000.0	2696000.0	-4386000.0	2790000.0	-892000.0	-681000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments

cnk:InternationalOperatingSegment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	5955000.0	-4645000.0	4413000.0	-1382000.0	-1622000.0	-14812000.0	2018000.0	-5437000.0	1226000.0	-440000.0	2052000.0	-2594000.0	-14283000.0	-134000.0	-3073000.0	2696000.0	-4386000.0	2790000.0	-892000.0	-681000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:GoodwillImpairmentLoss

Period End	2020-12-31
Value	0.0
Percentage of GoodwillImpairmentLoss	0.0

us-gaap:GoodwillImpairmentLoss us-gaap:StatementBusinessSegments

cnk:InternationalOperatingSegment

Period End	2020-12-31	2020-09-30
Value	0.0	16
Percentage of GoodwillImpairmentLoss	0.0	0.0

us-gaap:IncomeLossFromEquityMethodInvestments

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	-8.109	-6.806	-11.034	-16.077	-20.12	8.486	7.888	15	8.439	10	10	14	6.414	8.636	9.218	10	5.805	10	7.365	12	5.065	7.142	7.754	11	4.086	5.239	5.195	10	3.6	3.62	6.843	11	1.685	2.421	3.487	6.844	0.988	1.79	3.298	1.719	-1.804	2.438	1.559	-1.842	-3.182	0.027
Percentage of IncomeLossFromEquityMethodInvestments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:InvestmentType

cnk:EquityLoss

Period End	2021-06-30	2021-03-31
Value	8.066	6.348
Percentage of IncomeLossFromEquityMethodInvestments	-99.5	-93.3

cnk:InvestmentInNcm

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	-8.066	-6.348	-5.817	-6.126	-5.21	6.526	0.53
Percentage of IncomeLossFromEquityMethodInvestments	99.5	93.3	52.7	38.1	25.9	76.9	6.7

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31
Value	-0.043	-0.458	-5.217	-9.951	-14.91	1.96	7.358	6.089	7.821	6.01	7.533	7.328	5.918	4.621	7.766	5.869	5.981	6.819	5.678	6.575	5.093	5.269	-5.916
Percentage of IncomeLossFromEquityMethodInvestments	0.5	6.7	47.3	61.9	74.1	23.1	93.3	40.2	92.7	57.8	75.1	51.8	92.3	53.5	84.2	53.8	103.0	67.8	77.1	53.1	100.6	73.8	-76.3

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

cnk:ACJVLLC, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-0.485	-0.453	-0.659	-0.661	-0.697	0.74	1.091	0.035	0.472	1.678	0.622	0.24
Percentage of IncomeLossFromEquityMethodInvestments	6.0	6.7	6.0	4.1	3.5	8.7	13.8	0.2	5.6	16.1	6.2	1.7

cnk:DigitalCinemaDistributionCoalition, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	0.03	0.016	0.161	-0.492	-0.899	0.194	0.343	0.245	0.532	0.0	0.415	0.417
Percentage of IncomeLossFromEquityMethodInvestments	-0.4	-0.2	-1.5	3.1	4.5	2.3	4.3	1.6	6.3	0.0	4.1	2.9

cnk:DigitalCinemaImplementationPartners, us-gaap:OtherAffiliates

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-4.476	-8.514	-12.818	1.249	6.257	5.857	6.838	4.329	6.521	6.651
Percentage of IncomeLossFromEquityMethodInvestments	40.6	53.0	63.7	14.7	79.3	38.7	81.0	41.6	65.0	47.0

cnk:FEConceptsLLC, us-gaap:OtherAffiliates

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	0.412	-0.021	-0.243	-0.284	-0.496	-0.223	-0.333	-0.048	-0.021	0.003	-0.025	0.02
Percentage of IncomeLossFromEquityMethodInvestments	-5.1	0.3	2.2	1.8	2.5	-2.6	-4.2	-0.3	-0.2	0.0	-0.2	0.1

us-gaap:InterestPaid

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	37	22	49	6.35	38	8.774	37	9.311	37	9.104	35	11	39	11	40	8.731	39	10	39	10	42	15	39	11	42	11	42	11	42	11	42	12	50	11	41	16	43	15	43	15	36	16	36	19
Percentage of InterestPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InvestmentIncomeInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	3.828	0.646	0.601	1.348	0.803	2.084	2.527	3.903	3.468	2.691	2.753	2.761	2.862	2.238	1.854	1.682	1.38	1.333	1.366	1.665	2.013	1.352	1.925	2.389	2.875	1.519	2.012	1.543	1.03	1.014	0.656	1.569	0.594	0.803	2.717	1.396	0.493	1.767	1.66	2.955	1.724	1.769	1.865	1.807	1.38	1.053
Percentage of InvestmentIncomeInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LaborAndRelatedExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	50	31	28	20	8.864	87	101	103	108	96	97	92	100	93	93	87	89	84	81	84	84	75	78	76	76	69	71	67	69	64
Percentage of LaborAndRelatedExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	68	64	64	66	63	83	87	89	91	86
Percentage of OperatingLeaseCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

cnk:FacilityLeasingExpense, cnk:RealEstateProperty

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	67	63	63	65	63	81	83	88	89	84
Percentage of OperatingLeaseCost	99.4	99.3	98.7	98.8	99.8	98.1	95.4	98.3	98.0	98.0

cnk:UtilitiesAndOther, us-gaap:Equipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.423	0.445	0.829	0.823	0.131	1.541	3.999	1.569	1.861	1.743
Percentage of OperatingLeaseCost	0.6	0.7	1.3	1.2	0.2	1.9	4.6	1.7	2.0	2.0

us-gaap:OperatingLeaseImpairmentLoss us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseImpairmentLoss

cnk:InternationalOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	0.831	1.654	0.0	2.54	0.09	0.0	1.628
Percentage of OperatingLeaseImpairmentLoss	100.0	100.0	0.0	100.0	100.0	0.0	100.0

cnk:UsOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	6.141	1.123	0.0	5.952	0.253	2.157	8.047
Percentage of OperatingLeaseImpairmentLoss	739.0	67.9	0.0	234.3	281.1	0.0	494.3

us-gaap:OperatingLeasePayments

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	67	66	66	67	67	70	69	70	71	69
Percentage of OperatingLeasePayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeasePayments us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

cnk:FacilityLeasingExpense, cnk:RealEstateProperty

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.285	0.364	0.323	0.335	0.327	0.46	0.43	0.4	0.382	0.402
Percentage of OperatingLeasePayments	0.4	0.5	0.5	0.5	0.5	0.7	0.6	0.6	0.5	0.6

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31
Value	8.259	-9.465	15	-1.503	-3.702	-57.625	6.975	-25.408	4.925	0.755	4.588	-10.797	-56.248	0.204	-10.544	9.085	-18.401	14	-8.604	-3.669	24	13
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax us-gaap:StatementGeographical

cnk:OtherForeignCountries

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	-0.241	-0.237	0.024	-1.947	0.289	1.098	0.159	-0.297	0.585	0.203	0.204	-1.474	0.055	0.26	-1.425	1.165	-0.533	-0.105
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-2.9	2.5	0.2	129.5	-7.8	-1.9	2.3	1.2	11.9	26.9	4.4	13.7	-0.1	127.5	13.5	12.8	2.9	-0.7

country:BR

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	9.678	-6.912	8.755	-1.975	-6.605	-42.873	6.352	-16.156	3.998	-2.334	8.502	-8.077	-34.902	0.391	-81.259	10	-11.934	7.964
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	117.2	73.0	57.5	131.4	178.4	74.4	91.1	63.6	81.2	-309.1	185.3	74.8	62.1	191.7	770.7	117.4	64.9	53.5

country:CL

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	-0.376	-1.025	6.274	3.187	2.893	-11.126	-1.141	-5.856	0.366	1.473	-4.102	-0.45	-5.579	1.207	-9.708	2.323	-0.338	1.151
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-4.6	10.8	41.2	-212.0	-78.1	19.3	-16.4	23.0	7.4	195.1	-89.4	4.2	9.9	591.7	92.1	25.6	1.8	7.7

country:PE

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	-0.787	-1.172	-0.216	-0.707	-1.03	-1.45	0.46	-1.592	0.407	0.982	-1.245	-0.311	-0.762	0.182	-6.015	-1.11	0.204	2.039
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-9.5	12.4	-1.4	47.0	27.8	2.5	6.6	6.3	8.3	130.1	-27.1	2.9	1.4	89.2	57.0	-12.2	-1.1	13.7

stpr:CO

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	-0.015	-0.119	-0.061	0.751	-3.274	-1.758	-0.731	0.982
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-0.2	1.3	4.1	-20.3	5.7	6.9	-14.8	130.1

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax us-gaap:StatementGeographical, us-gaap:StatementEquityComponents

cnk:InternationalSubsidiaries, us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	8.259	-9.465	15	-1.503	-3.702	-57.625	6.975	-25.408	4.925	0.755	4.588	-10.797	-56.248	0.204
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30
Value	-1967000.0	2669000.0	2669000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	746000.0	5704000.0	2474000.0	6528000.0	849000.0	-24171000.0	2294000.0	-1291000.0	-5902000.0	-3311000.0	-3851000.0	0	0	0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	746000.0	5704000.0	6528000.0	849000.0	-24171000.0	-1291000.0	-5902000.0	-3311000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	746000.0	5704000.0	6528000.0	849000.0	-24171000.0	-1291000.0	-5902000.0	-3311000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	603000.0	2244000.0	-164000.0	5677000.0	275000.0	2230000.0	-699000.0	417000.0	1905000.0	1069000.0	1243000.0	0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

us-gaap:OtherCostAndExpenseOperating

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	61	49	50	43	34	100	117	123	122	110	110	112	115	109	83	92	91	88	90	94	89	81	79	84	85	75	74	79	78	75	75	84	76	68	70	74	69	66	61	72	65	59	62	64	57	55
Percentage of OtherCostAndExpenseOperating	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherDepreciationAndAmortization

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	671000.0	655000.0	1177000.0	1138000.0	1190000.0	1241000.0	1264000.0	1267000.0
Percentage of OtherDepreciationAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherExpenses

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	7.914	14	24	0.169
Percentage of OtherExpenses	100.0	100.0	100.0	100.0

us-gaap:PaymentsForHedgeFinancingActivities us-gaap:ShortTermDebtType

us-gaap:PaymentsForHedgeFinancingActivities

us-gaap:ConvertibleNotesPayable

Period End	2020-12-31
Value	0.0
Percentage of PaymentsForHedgeFinancingActivities	0.0

us-gaap:PaymentsOfDebtExtinguishmentCosts

Period End	2021-06-30	2021-03-31
Value	3.924	2.603
Percentage of PaymentsOfDebtExtinguishmentCosts	100.0	100.0

us-gaap:PaymentsOfDebtIssuanceCosts

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2016-12-31	2016-09-30	2015-12-31	2015-09-30	2013-12-31	2013-09-30	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	11	5.98	0.0	17	0.115	0.0	0.141	4.962	0.329	0.296	2.713	0.0	0.0	0.0	0.0	0.116	0.0	0.018	4.447	0.074	0.009	0.143	0.0	8.706
Percentage of PaymentsOfDebtIssuanceCosts	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31
Value	4000.0	8000.0	2572000.0	67000.0	107000.0	2691000.0	61000.0	0	300000.0	1947000.0	0	0	210000.0	2695000.0	0	22000.0	227000.0	2694000.0	6000.0	26000.0	1192000.0	5610000.0	0	22000.0	0	4748000.0	85000.0	0	0	9776000.0	0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	0.0

us-gaap:PriorPeriodReclassificationAdjustment us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:PriorPeriodReclassificationAdjustment

cnk:AccountingStandardUpdate202006

Period End	2021-03-31
Value	-68.164
Percentage of PriorPeriodReclassificationAdjustment	100.0

us-gaap:PriorPeriodReclassificationAdjustment us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents

cnk:AccountingStandardUpdate202006, us-gaap:AdditionalPaidInCapital

Period End	2021-03-31
Value	-73.604
Percentage of PriorPeriodReclassificationAdjustment	108.0

cnk:AccountingStandardUpdate202006, us-gaap:Parent

Period End	2021-03-31
Value	-68.164
Percentage of PriorPeriodReclassificationAdjustment	100.0

cnk:AccountingStandardUpdate202006, us-gaap:RetainedEarnings

Period End	2021-03-31
Value	5.44
Percentage of PriorPeriodReclassificationAdjustment	-8.0

us-gaap:ProceedsFromConvertibleDebt

Period End	2020-12-31
Value	0.0
Percentage of ProceedsFromConvertibleDebt	0.0

us-gaap:ProceedsFromIssuanceOfSeniorLongTermDebt

Period End	2021-06-30	2021-03-31
Value	765	405
Percentage of ProceedsFromIssuanceOfSeniorLongTermDebt	100.0	100.0

us-gaap:ProceedsFromIssuanceOfWarrants

Period End	2020-12-31
Value	0.0
Percentage of ProceedsFromIssuanceOfWarrants	0.0

us-gaap:ProceedsFromOtherDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	0.0	9.012	15	251
Percentage of ProceedsFromOtherDebt	0.0	100.0	100.0	100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	0	0	0	-392000.0	-745000.0	-294000.0	-294000.0	-1000000.0	-503000.0	-309000.0	-17000.0	-294000.0	-728000.0	12000.0	-233000.0	1503000.0	-747000.0	173000.0	-294000.0	2244000.0	-927000.0	9000.0	-178000.0	3518000.0	-2817000.0	-444000.0	-36000.0	3341000.0	-874000.0	-192000.0	458000.0	-227000.0	-909000.0	-110000.0	-917000.0	-184000.0	-152000.0	-277000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	1.974	0.021	0.402	0.014	0.143	0.055	2.778	0.224	0.096	0.057	0.363	1.422	1.658	0.477	0.282	0.295	10	3.835	0.172	2.957	0.094	0.347	3.683	1.31	2.585	2.388	0.572	0.426	1.496	0.051	4.391	11	10	8.006	1.239	0.07	0.628	0.039	1.099	0.66	3.986	0.485	17	1.846	1.657	0.491
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromWarrantExercises us-gaap:DebtInstrument

us-gaap:ProceedsFromWarrantExercises

cnk:FourPointFiveZeroConvertibleSeniorNotes

Period End	2020-08-21
Value	89
Percentage of ProceedsFromWarrantExercises	100.0

us-gaap:RestructuringCosts

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	-0.74	-0.208	0.307	0.524	19
Percentage of RestructuringCosts	100.0	100.0	100.0	100.0	100.0

us-gaap:RestructuringCosts us-gaap:EnvironmentalRemediationContingency

us-gaap:NaturalDisastersAndOtherCasualtyEvents

Period End	2020-12-31	2020-09-30	2020-06-30
Value	0.307	0.524	19
Percentage of RestructuringCosts	100.0	100.0	100.0

us-gaap:RestructuringCosts us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:EmployeeRelated, cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	0.017	9.118
Percentage of RestructuringCosts	3.2	46.7

cnk:EmployeeRelated, cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	0.017	0.163
Percentage of RestructuringCosts	3.2	0.8

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	0.507	10
Percentage of RestructuringCosts	96.8	53.3

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	0.353	2.831
Percentage of RestructuringCosts	67.4	14.5

cnk:FacilityClosureCosts, cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	0.154	7.589
Percentage of RestructuringCosts	29.4	38.8

us-gaap:RestructuringCosts us-gaap:RestructuringPlan, us-gaap:StatementBusinessSegments

cnk:TwentyTwentyRestructuringPlan, cnk:Consolidated

Period End	2020-09-30	2020-06-30
Value	0.524	19
Percentage of RestructuringCosts	100.0	100.0

cnk:TwentyTwentyRestructuringPlan, cnk:InternationalOperatingSegment

Period End	2020-09-30	2020-06-30
Value	0.37	2.994
Percentage of RestructuringCosts	70.6	15.3

cnk:TwentyTwentyRestructuringPlan, cnk:UsOperatingSegment

Period End	2020-09-30	2020-06-30
Value	0.154	16
Percentage of RestructuringCosts	29.4	84.7

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	30	24	23	37
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	100.0	100.0	100.0	100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType

cnk:RealEstateProperty

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	48	23	23	37	59	15
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0.0	0.0	100.6	99.5	0.0	0.0

us-gaap:Equipment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.156	-0.024	-0.132	0.188	0.127	0.329	0.238	0.101
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0.0	0.0	-0.6	0.5	0.0	0.0	0.0	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31
Value	2.94	15.25	-2.91
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	0.04	21.34	-0.67	-6.87	-6.9	32.12	-0.08	0.01	0.64	36.77	-0.07	0	-0.24	39.03	-0.24	0	-0.43	42.37	0.3	-0.22	1.07	29.83	0	-0.01	-0.48	43.28	0.03	0.18	0.18	28.54	0.81	-0.11	-0.05	29.44
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	0	0	0	32.12	0	0	0	36.77	39.03	0	0	0	42.37	0	0	0	29.83	43.28	0	0	0	28.54	0	0	0	29.44
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	-0.0	-0.0	-0.0	100.0	-0.0	0.0	0.0	100.0	100.0	-0.0	0.0	-0.0	100.0	0.0	-0.0	0.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	-0.0	-0.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:Range, us-gaap:AwardType

srt:Maximum, us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2019-09-30	2018-12-31	2018-09-30
Value	0	23.98	0	0	0	0	0	0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	112.4	-0.0	-0.0	-0.0	0.0	-0.0	0.0

srt:Minimum, us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2019-09-30	2018-12-31	2018-09-30
Value	0	21.01	0	0	-2.69	-0.07	-0.01	0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	98.5	-0.0	-0.0	3362.5	-700.0	14.3	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	1.329	1.148	7.926	0.244	0.671	8.029	0.394	0.0	1.885	5.745	1.686	0.0	0.008	7.807	0.003	0.078	2.078	6.013	0.0	0.239	1.681	12	4.133	-4.017	1.147	13	0.202	0.0	1.105	17
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0

us-gaap:RestrictedStockUnitsRSU

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	0.011	0.303	1.381	0.035	0.08	3.554	0.108	0.0	0.0	3.55	0.0	0.0	1.252	3.594	0.0	0.0	0.0	4.155	0.0	0.0	2.513	4.747	0.0	0.0	-0.018	5.501	0.108	0.0	0.118	11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	0.8	26.4	17.4	14.3	11.9	44.3	27.4	0.0	0.0	61.8	0.0	0.0	15650.0	46.0	0.0	0.0	0.0	69.1	0.0	0.0	149.5	37.3	0.0	-0.0	-1.6	41.8	53.5	0.0	10.7	64.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31
Value	-9.24	33.05	-6.33
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost

us-gaap:AccountingStandardsUpdate201807, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31
Value	0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0.0

us-gaap:ShortTermLeasePayments us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ShortTermLeasePayments

cnk:UtilitiesAndOther, us-gaap:Equipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	313000.0	315000.0	-374000.0	267000.0	985000.0	413000.0	2892000.0	452000.0	736000.0	620000.0
Percentage of ShortTermLeasePayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments

Period End	2020-09-30
Value	97
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	100.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30
Value	97
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	100.0

us-gaap:Parent

Period End	2020-09-30
Value	97
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	100.0

us-gaap:TangibleAssetImpairmentCharges us-gaap:StatementBusinessSegments

us-gaap:TangibleAssetImpairmentCharges

cnk:InternationalOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2017-09-30	2017-06-30	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	4.529	0.938	0.0	4.484	2.025	0.645	1.775	4.376	12	0.088	1.601	1.668	3.972	4.217	0.084	0.0	0.466	0.356	0.0	0.0	0.45	0.725	0.127	0.092	0.0	0.119	1.164	0.689	0.873	0.672	4.007	0.598	1.063
Percentage of TangibleAssetImpairmentCharges	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

cnk:UsOperatingSegment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2014-12-31	2014-09-30	2013-12-31	2013-09-30	2012-12-31	2012-09-30
Value	6.68	2.075	0.0	3.643	9.251	24	1.044	1.208	15	1.553	1.187	0.591	3.816	1.054	0.084	0.273	0.429	0.406	0.959	0.136	3.089	0.633	2.536	0.874	4.51	1.01	0.131	1.432	0.884
Percentage of TangibleAssetImpairmentCharges	147.5	221.2	0.0	81.2	456.8	3798.8	58.8	27.6	126.3	1764.8	74.1	0.0	228.8	26.5	2.0	0.0	510.7	0.0	205.8	38.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	1127.6	960.9

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30
Value	-2713000.0	-3144000.0	-7111000.0	1472000.0	-1329000.0	-350000.0	162000.0	211000.0	656000.0	183000.0	45000.0	304000.0	465000.0	297000.0	508000.0	209000.0	263000.0	382000.0	382000.0	336000.0	272000.0	244000.0	368000.0	304000.0	441000.0	218000.0	341000.0	293000.0
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:VariableLeasePayment us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:VariableLeasePayment

cnk:FacilityLeasingExpense, cnk:RealEstateProperty

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-2.088	0.191	2.91	12	14	18	20	15
Percentage of VariableLeasePayment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:ProductOrService, us-gaap:DebtInstrument

us-gaap:WriteOffOfDeferredDebtIssuanceCost

cnk:Fees, cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-06-30	2021-03-31
Value	0	1435000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost	0.0	100.0

cnk:UnamortizedDebt, cnk:FivePointOneTwoFivePercentSeniorNote

Period End	2021-06-30	2021-03-31
Value	0	1168000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost	0.0	81.4

cnk:AccruedCurrentLiabilitiesOther

Period End	2020-12-31	2019-12-31
Value	86	86
Percentage of AccruedCurrentLiabilitiesOther	100.0	100.0

cnk:AccruedFilmRental

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31
Value	10	93	95	106	97	97	86	79	65	64
Percentage of AccruedFilmRental	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

CNK

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock

us-gaap:TreasuryStock

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:RestrictedStock

us-gaap:RestrictedStockUnitsRSU

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument

cnk:FivePointOneTwoFivePercentSeniorNote

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:EnvironmentalRemediationContingency, us-gaap:UnusualOrInfrequentItem

cnk:CoronavirusAidReliefAndEconomicSecurityAct, us-gaap:NaturalDisastersAndOtherCasualtyEvents

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit us-gaap:EnvironmentalRemediationContingency, us-gaap:UnusualOrInfrequentItem

cnk:CoronavirusAidReliefAndEconomicSecurityAct, us-gaap:NaturalDisastersAndOtherCasualtyEvents

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

cnk:Ncm

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense