STAG

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

Plots across concepts

IncomeStatement

Balance Sheet

Assets

Current Assets

NonCurrent Assets

Liabilities

Noncurrent Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

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
us-gaap:CommonStockValue	███▇▇▇▆▅▅▄▃▃▂▂▂▁▁	1.603	1.591	1.582	1.492	1.489	1.487	1.428	1.33	1.264	1.182	1.122	1.078	1.042	0.972	0.97	0.939	0.914
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding	█▁	161.367	159.126	NA	149.905	149.027	147.656	NA	127.469	125.56	114.993	NA	106.333	100.733	97.323	NA	93.434974	88.181
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic	█▁	159.736	158.43	NA	148.997	148.663	147.57	NA	127.272	125.251	114.721	NA	105.783	100.386	97.021	NA	92.786852	88.181
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AwardType us-gaap:RestrictedStock	█▁	0.202	0.199	NA	0.189	0.19	0.182	NA	0.22	0.22	0.214	NA	0.193	0.196	0.202	NA	0.237	0.237382
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare	▃▃█▃▂▆▂▂▂▂▆▂▂▄▂▃▁	2.0000000000000002e-07	1.3e-07	6.300000000000001e-07	1.5e-07	1.2e-07	4.2e-07	1.1999999999999996e-07	7e-08	1.0000000000000001e-07	5.0000000000000004e-08	4.2000000000000006e-07	7e-08	9e-08	2.2e-07	6.999999999999998e-08	2.0000000000000002e-07	-1e-08
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare	▃▃█▃▂▆▂▂▂▂▆▂▂▄▂▃▁	2.0000000000000002e-07	1.3e-07	6.300000000000001e-07	1.5e-07	1.2e-07	4.2e-07	1.1999999999999996e-07	7e-08	1.0000000000000001e-07	5.0000000000000004e-08	4.1000000000000004e-07	7e-08	9e-08	2.2e-07	6e-08	2.0000000000000002e-07	-1e-08

		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

		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

		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
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation stag:LongTermIncentivePlanUnits,us-gaap:GeneralAndAdministrativeExpense	██▁▂▁▁▁▁▁▁▁▁▁▁▂▂▂	2.346	2.408	0.98	0.981	0.978	0.964	0.896	0.901	0.899	0.887	0.892	0.893	0.89	0.871	1.167	1.167	1.171
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation us-gaap:PerformanceShares,us-gaap:GeneralAndAdministrativeExpense	██▇▇▇▇▅▅▅▃▃▃▃▃▁▁▁	1.484	1.438	1.354	1.356	1.341	1.307	1.107	1.107	1.096	0.859	0.835	0.838	0.796	0.829	0.537	0.536	0.537
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType,us-gaap:IncomeStatementLocation us-gaap:RestrictedStock,us-gaap:GeneralAndAdministrativeExpense	▆█▃▃▃▃▁▂▂▂▂▁▂▂▆▆▆	0.586	0.651	0.489	0.487	0.481	0.467	0.414	0.447	0.444	0.427	0.429	0.406	0.429	0.434	0.597	0.594	0.59
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation us-gaap:GeneralAndAdministrativeExpense	██▃▃▃▃▂▂▂▁▁▁▁▁▂▁▂	4.539	4.615	2.945	2.946	2.938	2.852	2.517	2.556	2.537	2.278	2.251	2.236	2.215	2.22	2.388	2.384	2.388
us-gaap:AllocatedShareBasedCompensationExpense us-gaap:TitleOfIndividual,us-gaap:IncomeStatementLocation srt:Director,us-gaap:GeneralAndAdministrativeExpense	▅▄▅▅█▄▁▂▁	0.123	0.118	0.122	0.122	0.138	0.114	0.1	0.101	0.098	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax	▃▄█▃▂▃▃▁▁▁▃▂▂▃▂▃▁	34.051	36.757	101.085	28.525	16.932	34.006	23.048	4.641	-1.756	0.441	33.522	10.579	17.478	31.593	13.801	21.583	-0.036
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	▃▄█▃▂▃▃▁▁▁▃▂▂▃▂▃▁	34.815	37.498	103.396	29.136	17.307	34.847	23.732	4.755	-1.858	0.411	34.755	10.936	17.992	32.872	14.294	22.437	-0.142
us-gaap:CostsAndExpenses	▇█▇▆▅▅▅▄▃▄▃▃▂▂▂▁▁	95.777	99.051	94.416	87.883	83.992	85.484	81.886	78.86	70.602	76.769	72.758	70.601	65.353	69.437	66.453	63.411	61.529
us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	▂▂█▂▁▅▁▁▁▁	5.976	6.409	78.869	9.06	1.045	46.759	4.131	1.67	0.317	1.274	NA	NA	NA	NA	NA	NA	NA
us-gaap:GainsLossesOnExtinguishmentOfDebt	█▂██▁	0.0	-0.679	0.0	0.0	-0.834	NA	0.0	0.0	0.0	NA	0.0	-0.013	0.0	NA	0.0	-0.013	-0.002
us-gaap:GeneralAndAdministrativeExpense	██▅▃▃▅▃▂▂▃▂▂▁▂▁▂▁	12.578	12.79	10.756	9.537	9.406	10.373	9.223	8.924	8.587	9.212	8.415	8.911	7.978	8.748	8.259	8.38	7.939
us-gaap:InterestExpense	▇▇██▇▆▇▅▃▄▄▄▂▂▂▁▁	15.273	15.358	16.218	15.928	15.333	14.864	15.567	14.053	12.193	12.834	13.215	12.698	11.505	11.386	10.912	10.446	10.634
us-gaap:InterestPaidNet	▇▅█▅▇▄▇▅▃▂▆▄▁▃▂▂▂	16.103	13.471	16.907	13.277	15.976	12.544	16.118	13.407	11.516	10.449	14.489	12.127	8.691	11.057	10.209	9.997	9.911
us-gaap:NetIncomeLoss	▃▃█▃▂▆▂▂▂▁▄▂▂▃▂▂▁	32.65	24.875	96.055	23.743	18.909	63.44	17.444	10.9	13.762	7.175	45.526	8.595	14.572	24.195	8.656	21.011	1.412
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest	▃▃█▃▂▆▃▂▂▂▇▂▂▄▂▄▁	0.733	0.473	2.177	0.466	0.407	1.598	0.472	0.29	0.408	0.214	1.73	0.281	0.392	0.954	0.268	0.828	-0.044
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic	▃▃█▃▂▆▂▂▂▂▄▂▂▃▂▂▁	32.576	20.931	94.699	22.386	17.552	62.072	16.077	9.533	12.394	5.807	44.17	7.237	9.264	21.676	6.123	18.478	-1.119
us-gaap:NonoperatingIncomeExpense	▁▁█▂▁▅▁▁▁▁▅▁▂▃▂▃▁	-9.267	-9.596	62.697	-5.203	-14.309	31.974	-11.379	-12.371	-11.874	-11.544	26.724	-9.469	-5.157	11.303	-5.893	7.106	-9.296
us-gaap:OtherComprehensiveIncomeLossNetOfTax	▆█▇▇▆▁▇▅▃▅▄▆▆▇▇▆▆	1.432	12.15	5.164	4.927	-2.009	-30.191	5.816	-6.435	-16.028	-6.978	-12.501	2.06	3.028	7.723	5.37	0.598	-1.51
us-gaap:PreferredStockDividendsIncomeStatementImpact	▁▄▄▄▄▄▄▄▄▄▄▄█████	0.0	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	2.578	2.448	2.449	2.449	2.448
us-gaap:ProfitLoss	▃▃█▃▂▆▂▂▂▁▄▂▂▃▂▂▁	33.383	25.348	98.232	24.209	19.316	65.038	17.916	11.19	14.17	7.389	47.256	8.876	14.964	25.149	8.924	21.839	1.368
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	██▇▆▆▆▅▄▄▃▃▃▂▂▂▂▁	138.427	133.995	129.951	117.295	117.617	118.548	111.181	102.421	96.646	95.702	93.29	88.946	85.474	83.283	81.27	78.144	72.193
us-gaap:Revenues	██▇▆▆▆▅▄▄▃▃▃▂▂▂▂▁	138.427	133.995	129.951	117.295	117.617	118.548	111.181	102.421	96.646	95.702	93.29	88.946	85.474	83.283	81.27	78.144	72.193

		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

		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
us-gaap:Assets	███▆▆▇▆▅▄▃▃▂▂▂▂▁▁	4806.399	4732.567	4692.646	4265.757	4279.436	4537.305	4164.645	3745.289	3462.157	3239.474	3102.532	2989.275	2831.127	2695.932	2680.667	2601.472	2506.683
us-gaap:Liabilities	██▇▆▆▇▆▄▃▃▃▃▂▂▁▁▁	2089.497	2034.451	1921.594	1809.793	1799.119	2020.191	1800.754	1640.334	1498.905	1464.633	1432.9	1428.478	1341.5	1290.933	1270.36	1256.749	1214.553
us-gaap:LiabilitiesAndStockholdersEquity	███▆▆▇▆▅▄▃▃▂▂▂▂▁▁	4806.399	4732.567	4692.646	4265.757	4279.436	4537.305	4164.645	3745.289	3462.157	3239.474	3102.532	2989.275	2831.127	2695.932	2680.667	2601.472	2506.683
us-gaap:StockholdersEquity	███▇▇▇▆▅▄▃▃▂▂▂▂▁▁	2657.69	2638.508	2716.207	2404.671	2424.045	2456.323	2305.528	2049.094	1905.747	1719.399	1613.803	1506.761	1436.224	1351.923	1359.04	1293.961	1242.32

		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
us-gaap:CashAndCashEquivalentsAtCarryingValue	▁▁▁▂▃█▁▁▁▁▁▁▁▁▁▁▁	14.588	18.579	15.666	70.137	102.097	324.877	9.041	6.54	5.092	7.857	7.968	6.024	11.932	10.455	24.562	11.04	7.676
us-gaap:Land	██▇▆▆▆▅▅▄▃▃▃▂▁▁▁▁	510.413	500.947	492.783	447.356	444.489	443.427	435.923	420.215	397.193	377.53	364.023	355.59	342.722	324.734	321.56	321.365	310.753

		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
us-gaap:AmortizationOfIntangibleAssets us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:OtherIntangibleAssets	▇█▅▇▆▅▆▃▂▁▂▅▃▃▄▂▂	21.422	22.447	20.002	21.78	21.076	20.302	20.541	18.472	17.899	16.814	17.672	20.361	18.237	18.1	19.189	17.934	17.42
us-gaap:Goodwill		NA	NA	4.9	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:IntangibleAssetsNetExcludingGoodwill	▇██▆▆▇▇▅▄▃▂▂▁▁▁▁▂	482.672	490.532	499.802	439.046	451.738	473.61	475.149	413.955	381.133	348.439	342.015	327.734	316.221	305.188	313.253	318.915	322.503
us-gaap:FiniteLivedIntangibleAssetsNet	▇██▆▆▇▇▅▄▃▂▂▁▁▁▁▂	482.672	490.532	499.802	439.046	451.738	473.61	475.149	413.955	381.133	348.439	342.015	327.734	316.221	305.188	313.253	318.915	322.503
us-gaap:OperatingLeaseRightOfUseAsset	████▇▇▅▅▅▅▁	24.634	25.016	25.403	24.124	22.168	22.528	15.129	15.425	15.717	16.005	0.0	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

		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
us-gaap:LongTermDebt	██▆▅▅▇▆▄▃▃▃▃▁▂▁▁▁	1884.131	1833.29	1703.29	1596.242	1596.191	1823.972	1645.013	1477.03	1354.222	1340.838	1325.908	1320.467	1168.459	1195.583	1173.781	1147.929	1121.696
us-gaap:MinorityInterest	▇▇▄▂▅█▆▅▆▅▅▄▃▃▂▂▁	59.212	59.608	54.845	51.293	56.272	60.791	58.363	55.861	57.505	55.442	55.829	54.036	53.403	53.076	51.267	50.762	49.81
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	███▁	3.248	3.248	3.188	2.222	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree	██▆▁	3.291	3.291	3.248	3.1	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour	██▆▁	3.336	3.336	3.291	3.153	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive		NA	NA	3.336	3.196	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	███▁	62.365	62.365	62.365	59.245	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
us-gaap:StockholdersEquity	███▇▇▇▆▅▄▃▃▂▂▂▂▁▁	2657.69	2638.508	2716.207	2404.671	2424.045	2456.323	2305.528	2049.094	1905.747	1719.399	1613.803	1506.761	1436.224	1351.923	1359.04	1293.961	1242.32
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	███▇▇▇▆▅▄▃▃▂▂▂▂▁▁	2716.902	2698.116	2771.052	2455.964	2480.317	2517.114	2363.891	2104.955	1963.252	1774.841	1669.632	1560.797	1489.627	1404.999	1410.307	1344.723	1292.13
us-gaap:CommonStockValue	███▇▇▇▆▅▅▄▃▃▂▂▂▁▁	1.603	1.591	1.582	1.492	1.489	1.487	1.428	1.33	1.264	1.182	1.122	1.078	1.042	0.972	0.97	0.939	0.914
us-gaap:AdditionalPaidInCapital	███▇▇▇▆▅▄▄▃▃▂▂▂▁▁	3486.942	3443.787	3421.721	3155.271	3148.163	3142.495	2970.553	2687.118	2501.013	2266.695	2118.179	2003.983	1905.002	1724.627	1725.825	1638.309	1572.943
us-gaap:RetainedEarningsAccumulatedDeficit	▁▂▂▁▂▃▃▃▄▅▆▆▆▇▇██	-804.113	-778.727	-742.071	-782.037	-750.77	-714.799	-723.027	-690.324	-653.759	-621.225	-584.979	-589.785	-559.312	-530.257	-516.691	-489.078	-474.756
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	▃▃▂▂▁▁▄▄▄▆▇██▇▇▆▆	-26.742	-28.143	-40.025	-45.055	-49.837	-47.86	-18.426	-24.03	-17.771	-2.253	4.481	16.485	14.492	11.581	3.936	-1.209	-1.781
us-gaap:MinorityInterest	▇▇▄▂▅█▆▅▆▅▅▄▃▃▂▂▁	59.212	59.608	54.845	51.293	56.272	60.791	58.363	55.861	57.505	55.442	55.829	54.036	53.403	53.076	51.267	50.762	49.81
us-gaap:StockIssuedDuringPeriodValueNewIssues	▂▂█▁▁▅█▆▇▅▄▃▅	41.793	21.566	265.849	-0.021	-0.067	172.723	284.253	183.212	236.336	150.189	113.99	98.517	174.918	NA	87.918	65.239	205.842
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▆▅▅▅▂▄▄▄▁▄▄▄▁▄▄▄	4.539	3.273	2.915	2.953	2.948	1.371	2.401	2.576	2.555	0.863	2.257	2.254	2.213	0.706	2.394	2.394	2.401

		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
us-gaap:NetCashProvidedByUsedInOperatingActivities	█▆▅▆▆▅▃▄▄▂▂▂▃▁▁▁▁	88.913	73.46	69.791	76.043	77.508	70.58	58.427	64.359	63.421	47.15	49.159	51.289	55.347	41.974	42.045	44.091	45.268
us-gaap:NetCashProvidedByUsedInInvestingActivities	▆▇▁▇██▁▃▄▅▆▅▆█▇▇▄	-122.515	-79.502	-440.582	-58.952	-19.109	-35.98	-456.899	-321.131	-267.728	-176.816	-113.951	-194.315	-162.823	-36.112	-103.342	-94.592	-267.173
us-gaap:NetCashProvidedByUsedInFinancingActivities	▄▄▇▃▁▇█▇▆▅▅▅▅▄▅▄▆	29.8	8.02	316.37	-56.933	-285.18	294.919	401.063	256.45	201.594	119.432	76.079	136.225	107.818	-16.277	74.819	53.865	222.499
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	▄▄▃▃▁█▄▄▄▄▄▄▄▄▄▄	-3.802	1.978	-54.421	-39.842	-226.781	329.519	2.591	-0.322	-2.713	-10.234	11.287	-6.801	0.342	-10.415	13.542	-1.872	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
us-gaap:AmortizationOfFinancingCosts us-gaap:IncomeStatementLocation us-gaap:InterestExpense	█▁▇▇▇▅▅▅▄▄▄▄▂▂	0.789	0.487	0.75	0.75	0.746	0.676	0.674	0.673	0.618	0.618	0.618	0.617	0.547	0.534	NA	NA	NA
us-gaap:DepreciationDepletionAndAmortization	██▇▇▆▆▆▄▄▃▃▄▂▂▂▂▁	57.332	58.407	54.523	53.921	53.606	52.688	51.606	46.908	44.633	42.303	42.396	44.355	40.901	39.965	40.595	38.186	36.147
us-gaap:IncreaseDecreaseInAccountsReceivable	▄▁█▂▄▄▆▄▂▄▅▅▃▃▄▅▃	0.069	-3.281	5.663	-1.656	-0.034	0.509	3.018	0.88	-2.248	0.859	1.404	1.415	-1.068	-0.848	1.17	2.317	-1.205
us-gaap:NetCashProvidedByUsedInOperatingActivities	█▆▅▆▆▅▃▄▄▂▂▂▃▁▁▁▁	88.913	73.46	69.791	76.043	77.508	70.58	58.427	64.359	63.421	47.15	49.159	51.289	55.347	41.974	42.045	44.091	45.268
us-gaap:NetIncomeLoss	▃▃█▃▂▆▂▂▂▁▄▂▂▃▂▂▁	32.65	24.875	96.055	23.743	18.909	63.44	17.444	10.9	13.762	7.175	45.526	8.595	14.572	24.195	8.656	21.011	1.412
us-gaap:ProfitLoss	▃▃█▃▂▆▂▂▂▁▄▂▂▃▂▂▁	33.383	25.348	98.232	24.209	19.316	65.038	17.916	11.19	14.17	7.389	47.256	8.876	14.964	25.149	8.924	21.839	1.368
us-gaap:ShareBasedCompensation	██▃▃▃▃▂▂▂▁▁▁▁▁▂▁▂	4.539	4.615	2.945	2.946	2.938	2.852	2.517	2.556	2.537	2.278	2.251	2.236	2.215	2.22	2.388	2.384	2.388

		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
us-gaap:NetCashProvidedByUsedInInvestingActivities	▆▇▁▇██▁▃▄▅▆▅▆█▇▇▄	-122.515	-79.502	-440.582	-58.952	-19.109	-35.98	-456.899	-321.131	-267.728	-176.816	-113.951	-194.315	-162.823	-36.112	-103.342	-94.592	-267.173

		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
us-gaap:NetCashProvidedByUsedInFinancingActivities	▄▄▇▃▁▇█▇▆▅▅▅▅▄▅▄▆	29.8	8.02	316.37	-56.933	-285.18	294.919	401.063	256.45	201.594	119.432	76.079	136.225	107.818	-16.277	74.819	53.865	222.499
us-gaap:PaymentsOfDividends	█▇▆▇▇▆▅▅▄▃▃▃▂▁▂▁▁	62.216	59.996	55.995	56.42	56.985	54.883	50.278	49.369	47.646	42.288	41.723	41.404	39.542	36.2	37.351	36.267	34.665
us-gaap:Dividends us-gaap:StatementEquityComponents us-gaap:Parent	██▇▇▇▇▆▅▄▄▃▂▂▂▂▁▁	58.036	58.828	56.089	55.01	54.88	54.822	50.115	47.465	46.296	42.834	40.72	39.094	38.481	36.966	36.269	35.343	33.837

		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

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
Value	1603000.0	1591000.0	1582000.0	1492000.0	1489000.0	1487000.0	1428000.0	1330000.0	1264000.0	1182000.0	1122000.0	1078000.0	1042000.0	972000.0	970000.0	939000.0	914000.0	833000.0	804000.0	725000.0	682000.0	682000.0	681000.0	681000.0	679000.0	649000.0	644000.0	572000.0	551000.0	482000.0	447000.0	440000.0	422000.0	422000.0	357000.0	349000.0	249000.0	160000.0	159000.0
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
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

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	2016-03-31	2015-03-31	2011-09-30
Value	161	159	149	149	147	127	125	114	106	100	97	93	88	81	71	67	64	15
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

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	2016-03-31	2015-03-31	2011-09-30
Value	159	158	148	148	147	127	125	114	105	100	97	92	88	81	71	67	64	15
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

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AwardType

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:RestrictedStock

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
Value	202000.0	199000.0	189000.0	190000.0	182000.0	220000.0	220000.0	214000.0	193000.0	196000.0	202000.0	237000.0	237380.0	239830.0	272340.0	275430.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

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	2016-03-31	2015-03-31
Value	0.2	0.13	0.63	0.15	0.12	0.42	0.12	0.07	0.1	0.05	0.42	0.07	0.09	0.22	0.07	0.2	-0.01	-0.03	0.41	-0.05	0.12	-0.06
Percentage of IncomeLossFromContinuingOperationsPerBasicShare	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

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	2016-03-31	2015-03-31
Value	0.2	0.13	0.63	0.15	0.12	0.42	0.12	0.07	0.1	0.05	0.41	0.07	0.09	0.22	0.06	0.2	-0.01	-0.03	0.41	-0.05	0.12	-0.06
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:IncomeStatementLocation

us-gaap:AllocatedShareBasedCompensationExpense

stag:LongTermIncentivePlanUnits, 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
Value	2.346	2.408	0.98	0.981	0.978	0.964	0.896	0.901	0.899	0.887	0.892	0.893	0.89	0.871	1.167	1.167	1.171	1.17	1.097	1.099	1.098	2.795	1.174	1.2	1.2	1.1	-0.4	0.6	2.6	0.6	0.4	0.4
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.7	1.8	0.0	0.8	0.8	0.8	0.0	0.9	0.9	0.9	0.0	1.0	1.0	1.0	0.0	1.5	1.6	0.0	0.0	0.0	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 stag:LongTermIncentivePlanUnits us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:PerformanceShares, 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
Value	1.484	1.438	1.354	1.356	1.341	1.307	1.107	1.107	1.096	0.859	0.835	0.838	0.796	0.829	0.537	0.536	0.537	0.537	0.321	0.322	0.322	0.172	0.123	0.1	0.1	0.1	-0.2	0.1	0.3	0.1	0.1	0.1
Percentage of AllocatedShareBasedCompensationExpense	63.3	59.7	138.2	138.2	137.1	135.6	123.5	122.9	121.9	96.8	93.6	93.8	89.4	95.2	46.0	45.9	45.9	45.9	29.3	29.3	29.3	6.2	10.5	8.3	8.3	9.1	50.0	16.7	11.5	16.7	25.0	25.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.1	1.1	0.0	1.2	1.1	1.1	0.0	1.1	1.1	0.9	0.0	0.9	0.9	1.0	0.0	0.7	0.7	0.0	0.0	0.0	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 us-gaap:PerformanceShares us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:RestrictedStock, 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
Value	0.586	0.651	0.489	0.487	0.481	0.467	0.414	0.447	0.444	0.427	0.429	0.406	0.429	0.434	0.597	0.594	0.59	0.592	0.532	0.533	0.534	0.558	0.532	0.5	0.5	0.5	0.3	0.3	0.3	0.3	0.2	0.2
Percentage of AllocatedShareBasedCompensationExpense	25.0	27.0	49.9	49.6	49.2	48.4	46.2	49.6	49.4	48.1	48.1	45.5	48.2	49.8	51.2	50.9	50.4	50.6	48.5	48.5	48.6	20.0	45.3	41.7	41.7	45.5	-75.0	50.0	11.5	50.0	50.0	50.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.4	0.5	0.0	0.4	0.4	0.4	0.0	0.4	0.5	0.4	0.0	0.5	0.5	0.5	0.0	0.8	0.8	0.0	0.0	0.0	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 us-gaap:RestrictedStock us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

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
Value	4.539	4.615	2.945	2.946	2.938	2.852	2.517	2.556	2.537	2.278	2.251	2.236	2.215	2.22	2.388	2.384	2.388	2.387	2.037	2.043	2.044	3.605	1.878	1.9	1.9	1.8	-0.3	1.0	3.3	1.1	0.7	0.7
Percentage of AllocatedShareBasedCompensationExpense	193.5	191.7	300.5	300.3	300.4	295.9	280.9	283.7	282.2	256.8	252.4	250.4	248.9	254.9	204.6	204.3	203.9	204.0	185.7	185.9	186.2	129.0	160.0	158.3	158.3	163.6	75.0	166.7	126.9	183.3	175.0	175.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.3	3.4	0.0	2.5	2.5	2.4	0.0	2.5	2.6	2.4	0.0	2.5	2.6	2.7	0.0	3.1	3.3	0.0	0.0	0.0	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 us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:AllocatedShareBasedCompensationExpense us-gaap:TitleOfIndividual, us-gaap:IncomeStatementLocation

srt:Director, 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
Value	0.123	0.118	0.122	0.122	0.138	0.114	0.1	0.101	0.098
Percentage of AllocatedShareBasedCompensationExpense	5.2	4.9	12.4	12.4	14.1	11.8	11.2	11.2	10.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	0.1	0.0	0.1	0.1	0.1	0.0	0.1	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:Director us-gaap:GeneralAndAdministrativeExpense	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
Value	34	36	101	28	16	34	23	4.641	-1.756	0.441	33	10	17	31	13	21	-0.036	1.332	47	2.538	-14.534	0.129	-14.204	-11.586	-0.442	-5.042	-4.53	1.594	-4.408	-0.551	6.406	-0.262	3.346	-0.143	-1.862	-4.134	-0.641	-0.389	-1.515	-0.384
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.6	27.4	0.0	24.3	14.4	28.7	0.0	4.5	-1.8	0.5	0.0	11.9	20.4	37.9	0.0	27.6	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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
Value	34	37	103	29	17	34	23	4.755	-1.858	0.411	34	10	17	32	14	22	-0.142	1.281	49	2.462	-15.54	-0.022	-15.071	-12.316	-0.607	-5.432	-4.882	1.551	-4.843	-1.061	6.983	-0.74	3.471	-0.407	-2.297	-5.493	-1.528	-1.361	-2.756	-0.572
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	25.2	28.0	0.0	24.8	14.7	29.4	0.0	4.6	-1.9	0.4	0.0	12.3	21.0	39.5	0.0	28.7	-0.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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
Value	95	99	94	87	83	85	81	78	70	76	72	70	65	69	66	63	61	59	59	53	62	54	72	52	49	44	45	37	38	34	30	29	27	26	20	22	16	15	16	13	10
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	69.2	73.9	0.0	74.9	71.4	72.1	0.0	77.0	73.1	80.2	0.0	79.4	76.5	83.4	0.0	81.1	85.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Disposal Group Not Discontinued Operation Gain Loss On Disposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

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	5.976	6.409	78	9.06	1.045	46	4.131	1.67	0.317	1.274
Percentage of DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.3	4.8	0.0	7.7	0.9	39.4	0.0	1.6	0.3	1.3

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31	2019-09-30	2019-06-30	2018-12-31	2018-09-30	2018-06-30	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	2012-12-31	2012-09-30	2012-06-30
Value	0	-679000.0	0	0	-834000.0	0	0	0	0	-13000.0	0	0	-13000.0	-2000.0	0	-1288000.0	0	-839000.0	-1134000.0	0	0	0	0	0	-947000.0	18000.0
Percentage of GainsLossesOnExtinguishmentOfDebt	0.0	100.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	100.0	0.0	0.0	100.0	100.0	0.0	100.0	0.0	100.0	100.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	-0.5	0.0	0.0	-0.7	0.0	0.0	0.0	0.0	-0.0	0.0	0.0	-0.0	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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
Value	12	12	10	9.537	9.406	10	9.223	8.924	8.587	9.212	8.415	8.911	7.978	8.748	8.259	8.38	7.939	8.771	7.022	7.603	7.751	11	7.297	6.429	7.495	7.53	6.934	5.704	8.283	5.475	4.482	4.376	4.477	4.506	4.587	3.656	3.308	2.998	3.852	2.453	2.06
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.1	9.5	0.0	8.1	8.0	8.8	0.0	8.7	8.9	9.6	0.0	10.0	9.3	10.5	0.0	10.7	11.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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
Value	15	15	16	15	15	14	15	14	12	12	13	12	11	11	10	10	10	10	11	10	10	10	9.838	9.317	8.933	8.01	7.168	6.462	5.813	5.666	5.453	5.37	4.846	4.65	4.222	3.578	4.167	4.172	4.564	4.433	3.185
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	11.0	11.5	0.0	13.6	13.0	12.5	0.0	13.7	12.6	13.4	0.0	14.3	13.5	13.7	0.0	13.4	14.7	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:InterestExpense us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateSwap

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	15	15	16	15	15	14	15	14	12	12	13	12	11	11	10	10	10	10
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	11.0	11.5	0.0	13.6	13.0	12.5	0.0	13.7	12.6	13.4	0.0	14.3	13.5	13.7	0.0	13.4	14.7	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InterestRateSwap	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Interest Paid Net

us-gaap:InterestPaidNet

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	16	13	16	13	15	12	16	13	11	10	14	12	8.691	11	10	9.997	9.911	10	10	10	9.906	8.721	9.995	8.033	7.422	6.99
Percentage of InterestPaidNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	11.6	10.1	0.0	11.3	13.6	10.6	0.0	13.1	11.9	10.9	0.0	13.6	10.2	13.3	0.0	12.8	13.7	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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
Value	32	24	96	23	18	63	17	10	13	7.175	45	8.595	14	24	8.656	21	1.412	0.172	33	-0.185	-9.727	11	-19.019	-4.321	-4.831	-1.229	-5.244	0.341	-2.356	0.385	2.098	0.629	0.173	-0.153	-3.372	-3.668	-0.641	-1.942	-2.534	-0.384	-3.903
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	0.0	20.2	16.1	53.5	0.0	10.6	14.2	7.5	0.0	9.7	17.0	29.1	0.0	26.9	2.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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
Value	733000.0	473000.0	2177000.0	466000.0	407000.0	1598000.0	472000.0	290000.0	408000.0	214000.0	1730000.0	281000.0	392000.0	954000.0	268000.0	828000.0	-44000.0	-103000.0	1574000.0	-216000.0	-745000.0	455000.0	-1115000.0	-359000.0	-397000.0	-198000.0	-230000.0	-90000.0	-310000.0	-364000.0	338000.0	-335000.0	-357000.0	-265000.0	-476000.0	-1248000.0	-887000.0	-972000.0	-1241000.0	-188000.0	-1996000.0
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	0.4	0.0	0.4	0.3	1.3	0.0	0.3	0.4	0.2	0.0	0.3	0.5	1.1	0.0	1.1	-0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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
Value	32	20	94	22	17	62	16	9.533	12	5.807	44	7.237	9.264	21	6.123	18	-1.119	-2.359	30	-4.281	-13.823	8.334	-21.827	-7.128	-7.638	-4.042	-5.244	-2.458	-5.151	-2.415	2.095	-2.147	-2.41	-1.775	-3.51	-5.262	-2.235	-1.942	-2.533	-0.384	-3.903
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	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.5	15.6	0.0	19.1	14.9	52.4	0.0	9.3	12.8	6.1	0.0	8.1	10.8	26.0	0.0	23.6	-1.6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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
Value	-9.267	-9.596	62	-5.203	-14.309	31	-11.379	-12.371	-11.874	-11.544	26	-9.469	-5.157	11	-5.893	7.106	-9.296	-10.147	27	-9.858	-8.054	5.695	-6.563	-7.602	-8.931	-8.007	-7.204	-4.355	-5.809	-5.662	-5.449	-5.367	-4.87	-4.647	-4.22	-4.516	-4.835	-3.953	-3.527	-3.796	-6.404
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-6.7	-7.2	0.0	-4.4	-12.2	27.0	0.0	-12.1	-12.3	-12.1	0.0	-10.6	-6.0	13.6	0.0	9.1	-12.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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
Value	1.432	12	5.164	4.927	-2.009	-30.191	5.816	-6.435	-16.028	-6.978	-12.501	2.06	3.028	7.723	5.37	0.598	-1.51	1.212	14	2.863	-5.068	-11.823	5.063	-7.636	4.621	-4.005	-2.238	1.3	-2.177	-1.082	1.773	-1.034	3.655	0.011	0.097	-0.577
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.0	9.1	0.0	4.2	-1.7	-25.5	0.0	-6.3	-16.6	-7.3	0.0	2.3	3.5	9.3	0.0	0.8	-2.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:OtherComprehensiveIncomeLossNetOfTax 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	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
Value	1.401	11	5.03	4.782	-1.977	-29.434	5.604	-6.259	-15.518	-6.734	-12.004	1.993	2.911	7.398	5.145	0.572	-1.445	1.16	14	2.704	-4.806	-11.217	4.815	-7.262	4.399	-3.813	-2.116	1.138	-2.015	-0.936	1.534	-0.9	3.167	0.01	0.056
Percentage of OtherComprehensiveIncomeLossNetOfTax	97.8	97.8	97.4	97.1	98.4	97.5	96.4	97.3	96.8	96.5	96.0	96.7	96.1	95.8	95.8	95.7	95.7	95.7	95.0	94.4	94.8	94.9	95.1	95.1	95.2	95.2	94.5	87.5	92.6	86.5	86.5	87.0	86.6	90.9	57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.0	8.9	0.0	4.1	-1.7	-24.8	0.0	-6.1	-16.1	-7.0	0.0	2.2	3.4	8.9	0.0	0.7	-2.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	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	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
Value	0.031	0.268	0.134	0.145	-0.032	-0.757	0.212	-0.176	-0.51	-0.244	-0.497	0.067	0.117	0.325	0.225	0.026	-0.065	0.052	0.753	0.159	-0.262	-0.606	0.248	-0.373	0.222	-0.192	-0.122	0.163	-0.163	-0.146	0.239	-0.134	0.488	0.001	0.041
Percentage of OtherComprehensiveIncomeLossNetOfTax	2.2	2.2	2.6	2.9	1.6	2.5	3.6	2.7	3.2	3.5	4.0	3.3	3.9	4.2	4.2	4.3	4.3	4.3	5.0	5.6	5.2	5.1	4.9	4.9	4.8	4.8	5.5	12.5	7.5	13.5	13.5	13.0	13.4	9.1	42.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.2	0.0	0.1	-0.0	-0.6	0.0	-0.2	-0.5	-0.3	0.0	0.1	0.1	0.4	0.0	0.0	-0.1	0.0	0.0	0.0	0.0	0.0	0.0	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 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	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	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
Value	1.401	11	5.03	4.782	-1.977	-29.434	5.604	-6.259	-15.518	-6.734	-12.004	1.993	2.911	7.398	5.145	0.572	-1.445	1.16	14	2.704	-4.806	-11.217	4.815	-7.262	4.399	-3.813	-2.116	1.138	-2.015	-0.936	1.534	-0.9	3.167	0.01	0.056
Percentage of OtherComprehensiveIncomeLossNetOfTax	97.8	97.8	97.4	97.1	98.4	97.5	96.4	97.3	96.8	96.5	96.0	96.7	96.1	95.8	95.8	95.7	95.7	95.7	95.0	94.4	94.8	94.9	95.1	95.1	95.2	95.2	94.5	87.5	92.6	86.5	86.5	87.0	86.6	90.9	57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.0	8.9	0.0	4.1	-1.7	-24.8	0.0	-6.1	-16.1	-7.0	0.0	2.2	3.4	8.9	0.0	0.7	-2.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

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	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	1.289	2.578	2.448	2.449	2.449	2.448	2.448	2.983	4.001	4.001	2.912	2.712	2.712	2.712	2.712
Percentage of PreferredStockDividendsIncomeStatementImpact	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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	1.0	0.0	1.1	1.1	1.1	0.0	1.3	1.3	1.3	0.0	1.4	3.0	2.9	0.0	3.1	3.4	0.0	0.0	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
Value	33	25	98	24	19	65	17	11	14	7.389	47	8.876	14	25	8.924	21	1.368	0.069	34	-0.401	-10.472	11	-20.134	-4.68	-5.228	-1.427	-2.644	0.251	-2.666	0.021	5.21	0.294	-0.184	-0.418	-2.394	-4.916	-1.528	-1.361	-2.756	-0.572	-5.899
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.1	18.9	0.0	20.6	16.4	54.9	0.0	10.9	14.7	7.7	0.0	10.0	17.5	30.2	0.0	27.9	1.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:ProfitLoss dei:LegalEntity

stag:TaxableRealEstateInvestmentTrustSubsidy

Period End	2021-06-30	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
Value	-0.004	0.0	0.0	0.0	0.0	0.0	0.0	0.3	-0.012	0.0	-0.022	-0.039	-0.036	0.0	-0.2	-0.2	-0.031	0.0	-0.1	-0.02	-0.011	-0.018	-0.007
Percentage of ProfitLoss	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	2.1	-0.2	0.0	-0.2	-0.3	-0.1	0.0	-0.9	-14.6	-44.9	0.0	24.9	0.2	-0.1	0.1	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.3	-0.0	0.0	-0.0	-0.0	-0.0	0.0	-0.3	-0.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stag:TaxableRealEstateInvestmentTrustSubsidy	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

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	32	24	96	23	18	63	17	10	13	7.175	45	8.621	14	21	6.207	18	-1.039	-2.276	30	-4.184	-13.731	8.434	-21.731	-7.033	-7.546	-3.941	-5.126	-2.444	-4.976	-2.327	2.16	-2.083	-2.344	-1.706	-3.469	-5.078	-2.2	-1.942	-2.533	-0.413	-3.903
Percentage of ProfitLoss	97.8	98.1	97.8	98.1	97.9	97.5	97.4	97.4	97.1	97.1	96.3	97.1	97.5	86.5	69.6	85.0	-76.0	-3298.6	86.9	1043.4	131.1	71.5	107.9	150.3	144.3	276.2	193.9	-973.7	186.6	-11081.0	41.5	-708.5	1273.9	408.1	144.9	103.3	144.0	142.7	91.9	72.2	66.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	0.0	20.2	16.1	53.5	0.0	10.6	14.2	7.5	0.0	9.7	17.1	26.1	0.0	23.8	-1.4	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 us-gaap:AccumulatedDistributionsInExcessOfNetIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	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	0.733	0.473	2.177	0.466	0.407	1.598	0.472	0.29	0.408	0.214	1.73	0.255	0.38	0.954	0.268	0.818	-0.042	-0.103	1.574	-0.218	-0.742	0.455	-1.115	-0.359	-0.394	-0.198	-0.23	-0.018	-0.402	-0.364	0.338	-0.335	-0.358	-0.265	-0.476	-1.391	-0.881	-0.972	-1.241	-0.159	-1.996
Percentage of ProfitLoss	2.2	1.9	2.2	1.9	2.1	2.5	2.6	2.6	2.9	2.9	3.7	2.9	2.5	3.8	3.0	3.7	-3.1	-149.3	4.5	54.4	7.1	3.9	5.5	7.7	7.5	13.9	8.7	-7.2	15.1	-1733.3	6.5	-113.9	194.6	63.4	19.9	28.3	57.7	71.4	45.0	27.8	33.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	0.4	0.0	0.4	0.3	1.3	0.0	0.3	0.4	0.2	0.0	0.3	0.4	1.1	0.0	1.0	-0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	0.0	0.0	0.0	0.0	0.0	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	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	32	24	96	23	18	63	17	10	13	7.175	45	8.621	14	24	8.656	21	1.41	0.172	33	-0.183	-9.73	11	-19.019	-4.321	-4.834	-1.229	-2.414	0.268	-2.264	0.385	4.872	0.629	0.174	-0.153	-1.918	-3.525	-0.647	-0.389	-1.515	-0.413	-3.903
Percentage of ProfitLoss	97.8	98.1	97.8	98.1	97.9	97.5	97.4	97.4	97.1	97.1	96.3	97.1	97.5	96.2	97.0	96.3	103.1	249.3	95.5	45.6	92.9	96.1	94.5	92.3	92.5	86.1	91.3	106.8	84.9	1833.3	93.5	213.9	-94.6	36.6	80.1	71.7	42.3	28.6	55.0	72.2	66.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	0.0	20.2	16.1	53.5	0.0	10.6	14.2	7.5	0.0	9.7	17.1	29.1	0.0	26.9	2.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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

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
Value	138	133	129	117	117	118	111	102	96	95	93	88	85	83	81	78	72
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
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

Revenues

us-gaap:Revenues

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	138	133	129	117	117	118	111	102	96	95	93	88	85	83	81	78	72
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	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

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	2011-09-30	2011-06-30
Value	4806	4732	4692	4265	4279	4537	4164	3745	3462	3239	3102	2989	2831	2695	2680	2601	2506	2251	2186	2048	1902	1897	1906	1824	1749	1692	1629	1500	1350	1312	1270	1213	1149	1049	1005	803	709	657	624	580	531
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
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

Liabilities

us-gaap:Liabilities

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	2089	2034	1921	1809	1799	2020	1800	1640	1498	1464	1432	1428	1341	1290	1270	1256	1214	1147	1119	1114	1042	994	1050	929	820	798	737	726	600	581	595	543	497	462	515	304	317	355	314	327	272
Percentage of Liabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	43.5	43.0	40.9	42.4	42.0	44.5	43.2	43.8	43.3	45.2	46.2	47.8	47.4	47.9	47.4	48.3	48.5	51.0	51.2	54.4	54.8	52.4	55.1	50.9	46.9	47.2	45.3	48.4	44.5	44.3	46.9	44.8	43.3	44.1	51.3	37.9	44.7	54.2	50.4	56.4	51.2

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
Value	4806	4732	4692	4265	4279	4537	4164	3745	3462	3239	3102	2989	2831	2695	2680	2601	2506	2251	2186	2048	1902	1897	1906	1824	1749	1692	1629	1500	1350	1312	1270	1213	1149	1049	1005	803	709	657	624	580	531
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
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

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
Value	2657	2638	2716	2404	2424	2456	2305	2049	1905	1719	1613	1506	1436	1351	1359	1293	1242	1064	1027	899	827	867	820	858	891	855	864	747	728	655	603	598	579	518	427	429	318	223	230	169	174
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
Percentage of Assets	55.3	55.8	57.9	56.4	56.6	54.1	55.4	54.7	55.0	53.1	52.0	50.4	50.7	50.1	50.7	49.7	49.6	47.3	47.0	43.9	43.5	45.7	43.0	47.0	50.9	50.6	53.0	49.8	53.9	49.9	47.5	49.3	50.5	49.4	42.5	53.5	44.9	34.0	36.9	29.2	32.8

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	2011-04-20	2011-04-19
Value	14	18	15	70	102	324	9.041	6.54	5.092	7.857	7.968	6.024	11	10	24	11	7.676	7.082	12	12	8.005	15	12	12	11	11	23	5.29	6.031	28	6.69	23	19	11	19	10	5.113	18	16	11	13	0.277	0.277
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
Percentage of Assets	0.3	0.4	0.3	1.6	2.4	7.2	0.2	0.2	0.1	0.2	0.3	0.2	0.4	0.4	0.9	0.4	0.3	0.3	0.6	0.6	0.4	0.8	0.6	0.7	0.7	0.7	1.5	0.4	0.4	2.2	0.5	2.0	1.7	1.1	1.9	1.3	0.7	2.8	2.6	2.1	2.5	0.0	0.0

Land

us-gaap:Land

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	510	500	492	447	444	443	435	420	397	377	364	355	342	324	321	321	310	281	272	254	234	229	228	219	213	202	191	169	145	138	134	126	121	109	104	90	81	74	70	67	59
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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	10.6	10.6	10.5	10.5	10.4	9.8	10.5	11.2	11.5	11.7	11.7	11.9	12.1	12.0	12.0	12.4	12.4	12.5	12.4	12.4	12.3	12.1	12.0	12.0	12.2	12.0	11.7	11.3	10.8	10.6	10.6	10.4	10.6	10.4	10.4	11.2	11.5	11.4	11.3	11.6	11.2

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AmortizationOfIntangibleAssets

us-gaap:OtherIntangibleAssets

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	21	22	20	21	21	20	20	18	17	16	17	20	18	18	19	17	17	18	17	16	16	15	16	15	14	14
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
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
Percentage of Assets us-gaap:OtherIntangibleAssets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	2020-12-31	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
Value	4900000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0	4923000.0
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
Percentage of Assets	0.1	0.4	0.4	0.4	0.4	0.4	0.5	0.5	0.6	0.7	0.7	0.8

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	2015-12-31
Value	482	490	499	439	451	473	475	413	381	348	342	327	316	305	313	318	322	289	294	276	256	276
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
Percentage of Assets	10.0	10.4	10.7	10.3	10.6	10.4	11.4	11.1	11.0	10.8	11.0	11.0	11.2	11.3	11.7	12.3	12.9	12.8	13.5	13.5	13.5	14.5

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations

Period End	2021-06-30	2020-12-31	2019-12-31	2018-06-30	2018-03-31	2017-12-31	2017-09-30
Value	0.0	0.0	0.0	0.0	0.8	2.1	0.8
Percentage of IntangibleAssetsNetExcludingGoodwill	0.0	0.0	0.0	0.0	0.3	0.7	0.3
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.1	0.0
Percentage of Assets us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations	0.0	0.0	0.0	0.0	0.0	0.0	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	2014-12-31	2014-09-30	2013-12-31
Value	482	490	499	439	451	473	475	413	381	348	342	327	316	305	313	318	322	289	294	276	256	263	276	247	235	214
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
Percentage of Assets	10.0	10.4	10.7	10.3	10.6	10.4	11.4	11.1	11.0	10.8	11.0	11.0	11.2	11.3	11.7	12.3	12.9	12.8	13.5	13.5	13.5	13.9	14.5	15.2	15.7	16.9

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AboveMarketLeases

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	2014-12-31
Value	55	57	58	56	56	58	60	54	51	40	42	38	39	39	41	43	44	37	37	34	33	35	38	38
Percentage of FiniteLivedIntangibleAssetsNet	11.5	11.7	11.7	12.8	12.5	12.4	12.7	13.3	13.5	11.6	12.3	11.8	12.5	13.1	13.3	13.6	13.8	12.9	12.8	12.5	13.2	13.6	13.8	15.5
Percentage of Assets	1.1	1.2	1.2	1.3	1.3	1.3	1.5	1.5	1.5	1.3	1.4	1.3	1.4	1.5	1.6	1.7	1.8	1.7	1.7	1.7	1.8	1.9	2.0	2.4
Percentage of Assets us-gaap:AboveMarketLeases	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:OtherIntangibleAssets

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	2014-12-31
Value	427	433	441	382	395	414	414	359	329	307	299	288	276	265	271	275	278	252	256	242	222	227	238	209
Percentage of FiniteLivedIntangibleAssetsNet	88.5	88.3	88.3	87.2	87.5	87.6	87.3	86.7	86.5	88.4	87.7	88.2	87.5	86.9	86.7	86.4	86.2	87.1	87.2	87.5	86.8	86.4	86.2	84.5
Percentage of Assets	8.9	9.2	9.4	9.0	9.2	9.1	10.0	9.6	9.5	9.5	9.7	9.7	9.8	9.8	10.1	10.6	11.1	11.2	11.7	11.8	11.7	12.0	12.5	12.9
Percentage of Assets us-gaap:OtherIntangibleAssets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	24	25	25	24	22	22	15	15	15	16	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	0.5	0.5	0.5	0.6	0.5	0.5	0.4	0.4	0.5	0.5	0.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BusinessAcquisition

stag:Acquisitions2020

Period End	2020-12-31	2020-09-30
Value	3.984	2.321
Percentage of OperatingLeaseRightOfUseAsset	15.7	9.6
Percentage of Assets	0.1	0.1
Percentage of Assets stag:Acquisitions2020	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	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2011-12-31
Value	1884	1833	1703	1596	1596	1823	1645	1477	1354	1340	1325	1320	1168	1195	1173	1147	1121	1067	1036	1024	956	919	987	860	764	747	686	546	556	496	452	423	479	273	296
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
Percentage of Assets	39.2	38.7	36.3	37.4	37.3	40.2	39.5	39.4	39.1	41.4	42.7	44.2	41.3	44.3	43.8	44.1	44.7	47.4	47.4	50.0	50.3	48.5	51.8	47.2	43.7	44.1	42.1	41.6	43.8	40.9	39.4	40.4	47.7	34.1	47.5

us-gaap:LongTermDebt us-gaap:DebtInstrument

us-gaap:LineOfCredit

Period End	2020-12-31	2019-12-31	2018-12-31
Value	107	146	100
Percentage of LongTermDebt	6.3	8.9	7.6
Percentage of Assets	2.3	3.5	3.2
Percentage of Assets us-gaap:LineOfCredit	0.0	0.0	0.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

stag:TermLoan, us-gaap:LongTermDebt

Period End	2020-12-31	2019-12-31	2018-12-31	2018-06-30	2018-03-31	2017-12-31
Value	971	871	596	521	521	446
Percentage of LongTermDebt	57.0	53.0	45.0	44.7	43.6	38.0
Percentage of Assets	20.7	20.9	19.2	18.4	19.3	16.6
Percentage of Assets stag:TermLoan us-gaap:LongTermDebt	0.0	0.0	0.0	0.0	0.0	0.0

stag:UnsecuredNotes, us-gaap:UnsecuredDebt

Period End	2020-12-31	2019-12-31	2018-12-31	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2016-12-31
Value	573	572	572	572	398	398	398	397
Percentage of LongTermDebt	33.7	34.8	43.2	49.0	33.3	33.9	34.7	38.4
Percentage of Assets	12.2	13.8	18.5	20.2	14.8	14.9	15.3	18.2
Percentage of Assets stag:UnsecuredNotes us-gaap:UnsecuredDebt	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:LineOfCredit

Period End	2021-06-30	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	2015-09-30	2014-12-31
Value	284	233	107	0.0	225	146	78	129	115	100	95	17	218	271	177	131
Percentage of LongTermDebt	15.1	12.7	6.3	0.0	12.3	8.9	5.3	9.5	8.6	7.6	7.2	1.5	18.2	23.1	20.7	19.1
Percentage of Assets	5.9	4.9	2.3	0.0	5.0	3.5	2.1	3.7	3.6	3.2	3.2	0.6	8.1	10.1	9.7	8.0
Percentage of Assets us-gaap:LineOfCredit	0.0	0.0	0.0	0.0	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: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	2017-12-31
Value	970	970	971	970	970	971	871	771	596	596	596	596	446
Percentage of LongTermDebt	51.5	52.9	57.0	60.8	60.8	53.3	53.0	52.2	44.1	44.5	45.0	45.1	38.0
Percentage of Assets	20.2	20.5	20.7	22.8	22.7	21.4	20.9	20.6	17.2	18.4	19.2	19.9	16.6
Percentage of Assets us-gaap:LongTermDebt	0.0	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:Mortgages

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	2015-09-30	2014-12-31
Value	55	56	51	52	52	54	54	55	55	56	56	56	57	57	58	232	225
Percentage of LongTermDebt	3.0	3.1	3.0	3.3	3.3	3.0	3.3	3.7	4.1	4.2	4.3	4.3	4.9	4.8	5.0	27.0	32.8
Percentage of Assets	1.2	1.2	1.1	1.2	1.2	1.2	1.3	1.5	1.6	1.7	1.8	1.9	2.0	2.1	2.2	12.7	13.8
Percentage of Assets us-gaap:Mortgages	0.0	0.0	0.0	0.0	0.0	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:UnsecuredDebt

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	2017-12-31	2016-12-31	2015-12-31	2015-09-30	2014-12-31	2014-09-30	2014-06-30	2013-12-31	2012-12-31	2012-09-30
Value	573	573	573	573	573	572	572	572	572	572	572	572	398	446	300	300	150	300	300	250	150	100
Percentage of LongTermDebt	30.4	31.3	33.7	35.9	35.9	31.4	34.8	38.8	42.3	42.7	43.2	43.3	33.9	43.1	30.4	34.9	21.9	0.0	0.0	45.0	31.3	36.5
Percentage of Assets	11.9	12.1	12.2	13.4	13.4	12.6	13.8	15.3	16.5	17.7	18.5	19.1	14.9	20.4	15.7	16.4	9.2	20.0	22.2	19.7	14.9	12.4
Percentage of Assets us-gaap:UnsecuredDebt	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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
Value	59	59	54	51	56	60	58	55	57	55	55	54	53	53	51	50	49	39	39	34	33	35	35	36	38	38	27	26	21	75	71	71	72	67	61	69	73	77	79
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
Percentage of Assets	1.2	1.3	1.2	1.2	1.3	1.3	1.4	1.5	1.7	1.7	1.8	1.8	1.9	2.0	1.9	2.0	2.0	1.8	1.8	1.7	1.7	1.9	1.9	2.0	2.2	2.3	1.7	1.7	1.6	5.8	5.6	5.9	6.3	6.4	6.2	8.6	10.4	11.8	12.7

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	3248000.0	3248000.0	3188000.0	2222000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.1	0.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	3291000.0	3291000.0	3248000.0	3100000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.1	0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	3336000.0	3336000.0	3291000.0	3153000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.1	0.1	0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

Period End	2020-12-31	2020-09-30
Value	3336000.0	3196000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive	100.0	100.0
Percentage of Assets	0.1	0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	62	62	62	59
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100.0	100.0	100.0	100.0
Percentage of Assets	1.3	1.3	1.3	1.4

Operating Lease Liability

us-gaap:OperatingLeaseLiability

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	27	27	27	26	24	24	16	17	17	17	0.0
Percentage of OperatingLeaseLiability	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	0.6	0.6	0.6	0.6	0.6	0.5	0.4	0.5	0.5	0.5	0.0

us-gaap:OperatingLeaseLiability us-gaap:BusinessAcquisition

stag:Acquisitions2020

Period End	2020-12-31	2020-09-30
Value	3.984	2.321
Percentage of OperatingLeaseLiability	14.3	8.8
Percentage of Assets	0.1	0.1
Percentage of Assets stag:Acquisitions2020	0.0	0.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	76	77	77	71
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0	100.0	100.0	100.0
Percentage of Assets	1.6	1.6	1.7	1.7

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	48	49	49	45
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0	100.0	100.0	100.0
Percentage of Assets	1.0	1.0	1.1	1.1

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
Value	2657	2638	2716	2404	2424	2456	2305	2049	1905	1719	1613	1506	1436	1351	1359	1293	1242	1064	1027	899	827	867	820	858	891	855	864	747	728	655	603	598	579	518	427	429	318	223	230	169	174
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
Percentage of Assets	55.3	55.8	57.9	56.4	56.6	54.1	55.4	54.7	55.0	53.1	52.0	50.4	50.7	50.1	50.7	49.7	49.6	47.3	47.0	43.9	43.5	45.7	43.0	47.0	50.9	50.6	53.0	49.8	53.9	49.9	47.5	49.3	50.5	49.4	42.5	53.5	44.9	34.0	36.9	29.2	32.8

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	2011-04-19
Value	2716	2698	2771	2455	2480	2517	2363	2104	1963	1774	1669	1560	1489	1404	1410	1344	1292	1103	1066	933	860	903	855	894	929	894	891	774	749	731	674	670	651	586	489	499	392	301	309	253	259	-14.043
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
Percentage of Assets	56.5	57.0	59.1	57.6	58.0	55.5	56.8	56.2	56.7	54.8	53.8	52.2	52.6	52.1	52.6	51.7	51.5	49.0	48.8	45.6	45.2	47.6	44.9	49.1	53.1	52.8	54.7	51.6	55.5	55.7	53.1	55.2	56.7	55.9	48.7	62.1	55.3	45.8	49.6	43.6	48.8	0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

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	-804.113	-778.727	-742.071	-782.037	-750.77	-714.799	-723.027	-690.324	-653.759	-621.225	-584.979	-589.785	-559.312	-530.257	-516.691	-489.078	-474.756	-442.329	-410.978	-416.54	-387.306	-349.881	-334.623	-289.413	-258.897	-229.006	-203.241	-176.851	-155.911	-133.744	-116.877	-105.697	-90.398	-75.383	-61.024	-47.916	-33.424	-24.485	-18.385	-11.718	-7.172
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-29.6	-28.9	-26.8	-31.8	-30.3	-28.4	-30.6	-32.8	-33.3	-35.0	-35.0	-37.8	-37.5	-37.7	-36.6	-36.4	-36.7	-40.1	-38.5	-44.6	-45.0	-38.7	-39.1	-32.3	-27.8	-25.6	-22.8	-22.8	-20.8	-18.3	-17.3	-15.8	-13.9	-12.9	-12.5	-9.6	-8.5	-8.1	-5.9	-4.6	-2.8
Percentage of Assets	-16.7	-16.5	-15.8	-18.3	-17.5	-15.8	-17.4	-18.4	-18.9	-19.2	-18.9	-19.7	-19.8	-19.7	-19.3	-18.8	-18.9	-19.6	-18.8	-20.3	-20.4	-18.4	-17.6	-15.9	-14.8	-13.5	-12.5	-11.8	-11.5	-10.2	-9.2	-8.7	-7.9	-7.2	-6.1	-6.0	-4.7	-3.7	-2.9	-2.0	-1.3
Percentage of Assets us-gaap:AccumulatedDistributionsInExcessOfNetIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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: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	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	-26.742	-28.143	-40.025	-45.055	-49.837	-47.86	-18.426	-24.03	-17.771	-2.253	4.481	16	14	11	3.936	-1.209	-1.781	-0.336	-1.496	-15.669	-18.373	-13.567	-2.35	-7.165	0.097	-4.302	-0.489	1.627	0.489	2.504	3.44	1.906	2.806	-0.361	-0.371	-0.427
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-1.0	-1.0	-1.4	-1.8	-2.0	-1.9	-0.8	-1.1	-0.9	-0.1	0.3	1.1	1.0	0.8	0.3	-0.1	-0.1	-0.0	-0.1	-1.7	-2.1	-1.5	-0.3	-0.8	0.0	-0.5	-0.1	0.2	0.1	0.3	0.5	0.3	0.4	-0.1	-0.1	-0.1
Percentage of Assets	-0.6	-0.6	-0.9	-1.1	-1.2	-1.1	-0.4	-0.6	-0.5	-0.1	0.1	0.6	0.5	0.4	0.1	-0.0	-0.1	-0.0	-0.1	-0.8	-1.0	-0.7	-0.1	-0.4	0.0	-0.3	-0.0	0.1	0.0	0.2	0.3	0.2	0.2	-0.0	-0.0	-0.1
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	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	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	2011-04-19
Value	3486	3443	3421	3155	3148	3142	2970	2687	2501	2266	2118	2003	1905	1724	1725	1638	1572	1360	1293	1117	1018	1016	1017	1015	1010	949	928	783	744	646	577	562	527	524	419	408	282	179	179	181	177	0.002
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	128.3	127.6	123.5	128.5	126.9	124.8	125.7	127.7	127.4	127.7	126.9	128.4	127.9	122.7	122.4	121.8	121.7	123.3	121.3	119.6	118.3	112.5	118.9	113.4	108.7	106.2	104.1	101.2	99.2	88.5	85.5	83.9	81.0	89.6	85.7	81.9	72.0	59.4	58.1	71.7	68.5	-0.0
Percentage of Assets	72.5	72.8	72.9	74.0	73.6	69.3	71.3	71.7	72.2	70.0	68.3	67.0	67.3	64.0	64.4	63.0	62.7	60.5	59.2	54.5	53.5	53.6	53.4	55.6	57.7	56.1	57.0	52.2	55.1	49.3	45.4	46.4	45.9	50.0	41.8	50.9	39.8	27.2	28.8	31.2	33.5	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	0.0	0.0	0.0	0.0	0.0	0.0	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	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	1.603	1.591	1.582	1.492	1.489	1.487	1.428	1.33	1.264	1.182	1.122	1.078	1.042	0.972	0.97	0.939	0.914	0.833	0.804	0.725	0.682	0.682	0.681	0.681	0.679	0.649	0.644	0.572	0.551	0.482	0.447	0.44	0.422	0.422	0.357	0.349	0.249	0.16	0.159	0.159	0.159
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	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	0.1	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	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
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
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	0.0	0.0	0.0	0.0	0.0	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	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	59	59	54	51	56	60	58	55	57	55	55	54	53	53	51	50	49	39	39	34	33	35	35	36	38	38	27	26	21	75	71	71	72	67	61	69	73	77	79	83	85
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2.2	2.2	2.0	2.1	2.3	2.4	2.5	2.7	2.9	3.1	3.3	3.5	3.6	3.8	3.6	3.8	3.9	3.6	3.7	3.7	3.9	3.9	4.1	4.1	4.1	4.3	3.1	3.4	2.9	10.4	10.6	10.7	11.0	11.5	12.6	13.9	18.8	25.7	25.6	32.9	32.9
Percentage of Assets	1.2	1.3	1.2	1.2	1.3	1.3	1.4	1.5	1.7	1.7	1.8	1.8	1.9	2.0	1.9	2.0	2.0	1.8	1.8	1.7	1.7	1.9	1.9	2.0	2.2	2.3	1.7	1.7	1.6	5.8	5.6	5.9	6.3	6.4	6.2	8.6	10.4	11.8	12.7	14.3	16.1
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	0.0	0.0	0.0	0.0	0.0	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	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	2011-04-19
Value	2657	2638	2716	2404	2424	2456	2305	2049	1905	1719	1613	1506	1436	1351	1359	1293	1242	1064	1027	899	827	867	820	858	891	855	864	747	728	655	603	598	579	518	427	429	318	223	230	169	174	-14.043
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	97.8	97.8	98.0	97.9	97.7	97.6	97.5	97.3	97.1	96.9	96.7	96.5	96.4	96.2	96.4	96.2	96.1	96.4	96.3	96.3	96.1	96.1	95.9	95.9	95.9	95.7	96.9	96.6	97.1	89.6	89.4	89.3	89.0	88.5	87.4	86.1	81.2	74.3	74.4	67.1	67.1	100.0
Percentage of Assets	55.3	55.8	57.9	56.4	56.6	54.1	55.4	54.7	55.0	53.1	52.0	50.4	50.7	50.1	50.7	49.7	49.6	47.3	47.0	43.9	43.5	45.7	43.0	47.0	50.9	50.6	53.0	49.8	53.9	49.9	47.5	49.3	50.5	49.4	42.5	53.5	44.9	34.0	36.9	29.2	32.8	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

us-gaap:PreferredStock

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
Value	75	75	75	75	75	75	75	75	75	75	75	145	145	145	145	145	145	214	214	214	139	139	139	139	139	139	139	139	139	139	139	69	69	69	69	69	69
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2.7	3.1	3.0	3.0	3.2	3.6	3.8	4.2	4.5	4.8	5.0	10.3	10.3	10.8	11.2	13.1	13.6	22.9	24.9	23.7	16.3	15.5	15.0	15.5	15.6	18.0	18.5	19.0	20.6	20.7	21.3	11.8	14.1	13.8	17.6	22.9	22.3
Percentage of Assets	1.6	1.8	1.8	1.7	1.8	2.0	2.2	2.3	2.4	2.5	2.6	5.4	5.4	5.6	5.8	6.4	6.6	10.4	11.2	11.3	7.3	7.6	7.9	8.2	8.5	9.3	10.3	10.6	10.9	11.5	12.1	6.6	6.9	8.6	9.7	10.5	11.0
Percentage of Assets us-gaap:PreferredStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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
Value	1603000.0	1591000.0	1582000.0	1492000.0	1489000.0	1487000.0	1428000.0	1330000.0	1264000.0	1182000.0	1122000.0	1078000.0	1042000.0	972000.0	970000.0	939000.0	914000.0	833000.0	804000.0	725000.0	682000.0	682000.0	681000.0	681000.0	679000.0	649000.0	644000.0	572000.0	551000.0	482000.0	447000.0	440000.0	422000.0	422000.0	357000.0	349000.0	249000.0	160000.0	159000.0
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
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

Additional Paid In Capital

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	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31
Value	3486	3443	3421	3155	3148	3142	2970	2687	2501	2266	2118	2003	1905	1724	1725	1638	1572	1360	1293	1117	1018	1016	1017	928
Percentage of AdditionalPaidInCapital	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	72.5	72.8	72.9	74.0	73.6	69.3	71.3	71.7	72.2	70.0	68.3	67.0	67.3	64.0	64.4	63.0	62.7	60.5	59.2	54.5	53.5	53.6	53.4	57.0

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
Value	-804110000.0	-778730000.0	-742070000.0	-782040000.0	-750770000.0	-714800000.0	-723030000.0	-690320000.0	-653760000.0	-621220000.0	-584980000.0	-589780000.0	-559310000.0	-530260000.0	-516690000.0	-489080000.0	-474760000.0	-442330000.0	-410980000.0	-416540000.0	-387310000.0	-349880000.0	-334620000.0	-289410000.0	-258900000.0	-229010000.0	-203240000.0	-176850000.0	-155910000.0	-133740000.0	-116880000.0	-105700000.0	-90398000.0	-75383000.0	-61024000.0	-47916000.0	-33424000.0	-24485000.0	-18385000.0
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
Percentage of Assets	-16.7	-16.5	-15.8	-18.3	-17.5	-15.8	-17.4	-18.4	-18.9	-19.2	-18.9	-19.7	-19.8	-19.7	-19.3	-18.8	-18.9	-19.6	-18.8	-20.3	-20.4	-18.4	-17.6	-15.9	-14.8	-13.5	-12.5	-11.8	-11.5	-10.2	-9.2	-8.7	-7.9	-7.2	-6.1	-6.0	-4.7	-3.7	-2.9

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
Value	-26.742	-28.143	-40.025	-45.055	-49.837	-47.86	-18.426	-24.03	-17.771	-2.253	4.481	16	14	11	3.936	-1.209	-1.781	-0.336	-1.496	-15.669	-18.373	-13.567	-2.35	-7.165	0.097	-4.302	-0.489	1.627	0.489	2.504	3.44	1.906	2.806	-0.361	-0.371
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
Percentage of Assets	-0.6	-0.6	-0.9	-1.1	-1.2	-1.1	-0.4	-0.6	-0.5	-0.1	0.1	0.6	0.5	0.4	0.1	-0.0	-0.1	-0.0	-0.1	-0.8	-1.0	-0.7	-0.1	-0.4	0.0	-0.3	-0.0	0.1	0.0	0.2	0.3	0.2	0.2	-0.0	-0.0

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
Value	59	59	54	51	56	60	58	55	57	55	55	54	53	53	51	50	49	39	39	34	33	35	35	36	38	38	27	26	21	75	71	71	72	67	61	69	73	77	79
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
Percentage of Assets	1.2	1.3	1.2	1.2	1.3	1.3	1.4	1.5	1.7	1.7	1.8	1.8	1.9	2.0	1.9	2.0	2.0	1.8	1.8	1.7	1.7	1.9	1.9	2.0	2.2	2.3	1.7	1.7	1.6	5.8	5.6	5.9	6.3	6.4	6.2	8.6	10.4	11.8	12.7

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

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	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	2011-12-31	2011-09-30	2011-06-30
Value	41	21	265	-0.021	-0.067	172	284	183	236	150	113	98	174	87	65	205	68	181	25	0.0	75	0.0	3.066	61	10	152	44	41	77	15	36	0.2	117	5.379	130	0.0	0.0	205
Percentage of StockIssuedDuringPeriodValueNewIssues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	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	0.0	0.0	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

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

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	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	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	2011-12-31	2011-09-30	2011-06-30
Value	41	21	265	-0.021	-0.067	172	284	183	236	150	113	98	174	87	65	205	68	181	0.0	3.064	61	10	152	44	41	77	15	36	0.2	117	5.376	130	0.0	0.0	205
Percentage of StockIssuedDuringPeriodValueNewIssues	100.0	100.0	100.0	100.0	100.0	100.0	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	99.9	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	99.9	99.9	0.0	0.0	99.9
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
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	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	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	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	2011-12-31	2011-09-30	2011-06-30
Value	0.012	0.007	0.09	0.0	0.0	0.056	0.098	0.064	0.082	0.055	0.044	0.036	0.068	0.031	0.025	0.079	0.028	0.079	0.0	0.002	0.029	0.004	0.072	0.02	0.018	0.034	0.007	0.018	0.0	0.064	0.003	0.093	0.0	0.0	0.158
Percentage of StockIssuedDuringPeriodValueNewIssues	0.0	0.0	0.0	-0.0	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.1	0.0	0.0	0.1
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
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	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	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	2011-12-31	2011-09-30	2011-06-30
Value	41	21	265	-0.021	-0.067	172	284	183	236	150	113	98	174	87	65	205	68	181	25	0.0	75	0.0	3.066	61	10	152	44	41	77	15	36	0.2	117	5.379	130	0.0	0.0	205
Percentage of StockIssuedDuringPeriodValueNewIssues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	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	0.0	0.0	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
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

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2021-06-30	2021-03-31	2020-12-31	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	4.539	3.273	2.915	2.953	2.948	1.371	2.401	2.576	2.555	0.863	2.257	2.254	2.213	0.706	2.394	2.394	2.401	1.431	2.043	2.046	2.055	3.631	1.912	1.92	1.9	1.847	1.973	1.092	3.155	1.059	0.742	0.742	0.742	0.743	0.484	0.481	0.484	0.492	0.317	0.22	0.156
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
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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

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	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	2.192	-3.214	1.935	1.972	1.97	-0.858	1.517	1.675	1.656	-1.133	1.365	1.361	1.323	-0.855	1.227	1.227	1.23	0.454	0.945	0.948	0.957	0.841	0.69	0.698	0.707	0.71	0.378	0.448	0.657	0.441	0.34	0.34	0.339	0.341	0.247	0.244	0.251	0.251	0.2	0.103	0.039
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	48.3	-98.2	66.4	66.8	66.8	-62.6	63.2	65.0	64.8	-131.3	60.5	60.4	59.8	-121.1	51.3	51.3	51.2	31.7	46.3	46.3	46.6	23.2	36.1	36.4	37.2	38.4	19.2	41.0	20.8	41.6	45.8	45.8	45.7	45.9	51.0	50.7	51.9	51.0	63.1	46.8	25.0
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
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	0.0	0.0	0.0	0.0	0.0	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	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	2.347	6.607	0.98	0.981	0.978	2.618	0.916	0.901	0.899	2.368	0.892	0.893	0.89	2.097	1.167	1.167	1.171	1.171	1.098	1.098	1.098	2.79	1.222	1.222	1.193	1.137	1.595	0.644	2.498	0.618	0.402	0.402	0.403	0.402	0.237	0.237	0.233	0.241	0.117	0.117	0.117
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	51.7	201.9	33.6	33.2	33.2	191.0	38.2	35.0	35.2	274.4	39.5	39.6	40.2	297.0	48.7	48.7	48.8	81.8	53.7	53.7	53.4	76.8	63.9	63.6	62.8	61.6	80.8	59.0	79.2	58.4	54.2	54.2	54.3	54.1	49.0	49.3	48.1	49.0	36.9	53.2	75.0
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
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	0.0	0.0	0.0	0.0	0.0	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	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	2.192	-3.334	1.935	1.972	1.97	-1.247	1.485	1.675	1.656	-1.505	1.365	1.361	1.323	-1.391	1.227	1.227	1.23	0.26	0.945	0.948	0.957	0.841	0.69	0.698	0.707	0.71	0.378	0.448	0.657	0.441	0.34	0.34	0.339	0.341	0.247	0.244	0.251	0.251	0.2	0.103	0.039
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	48.3	-101.9	66.4	66.8	66.8	-91.0	61.8	65.0	64.8	-174.4	60.5	60.4	59.8	-197.0	51.3	51.3	51.2	18.2	46.3	46.3	46.6	23.2	36.1	36.4	37.2	38.4	19.2	41.0	20.8	41.6	45.8	45.8	45.7	45.9	51.0	50.7	51.9	51.0	63.1	46.8	25.0
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
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

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	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	88	73	69	76	77	70	58	64	63	47	49	51	55	41	42	44	45	31	37	38	35	24	31	36	32	21	30	25	26	14	27	21	21	12	17	12	9.688	7.887	4.109	8.771	1.786
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	64.2	54.8	53.7	64.8	65.9	59.5	52.6	62.8	65.6	49.3	52.7	57.7	64.8	50.4	51.7	56.4	62.7	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	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	-122520000.0	-79502000.0	-440580000.0	-58952000.0	-19109000.0	-35980000.0	-456900000.0	-321130000.0	-267730000.0	-176820000.0	-113950000.0	-194320000.0	-162820000.0	-36112000.0	-103340000.0	-94592000.0	-267170000.0	-100950000.0	-127100000.0	-165260000.0	-55359000.0	600000.0	-127180000.0	-98450000.0	-79704000.0	-66705000.0	-133500000.0	-167600000.0	-81769000.0	-38840000.0	-90341000.0	-79916000.0	-92639000.0	-62335000.0	-205890000.0	-100450000.0	-72249000.0	-38615000.0	-42434000.0	-50225000.0	-21799000.0
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-88.5	-59.3	-339.0	-50.3	-16.2	-30.4	-411.0	-313.5	-277.0	-184.8	-122.1	-218.5	-190.5	-43.4	-127.2	-121.0	-370.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	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	29	8.02	316	-56.933	-285.18	294	401	256	201	119	76	136	107	-16.277	74	53	222	64	89	131	12	-21.229	95	63	47	32	121	141	32	46	45	62	79	42	196	93	49	32	42	40	33
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	21.5	6.0	243.5	-48.5	-242.5	248.8	360.7	250.4	208.6	124.8	81.6	153.2	126.1	-19.5	92.1	68.9	308.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30
Value	-3.802	1.978	-54.421	-39.842	-226.781	329	2.591	-0.322	-2.713	-10.234	11	-6.801	0.342	-10.415	13	-1.872
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	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-2.7	1.5	-41.9	-34.0	-192.8	278.0	2.3	-0.3	-2.8	-10.7	12.1	-7.6	0.4	-12.5	16.7	-2.4

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts us-gaap:IncomeStatementLocation

us-gaap:AmortizationOfFinancingCosts

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
Value	789000.0	487000.0	750000.0	750000.0	746000.0	676000.0	674000.0	673000.0	618000.0	618000.0	618000.0	617000.0	547000.0	534000.0
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

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
Value	57	58	54	53	53	52	51	46	44	42	42	44	40	39	40	38	36	35	32	32	31	30	30	28	27	26	25	21	20	19	21
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

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

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	69000.0	-3281000.0	5663000.0	-1656000.0	-34000.0	509000.0	3018000.0	880000.0	-2248000.0	859000.0	1404000.0	1415000.0	-1068000.0	-848000.0	1170000.0	2317000.0	-1205000.0	-157000.0	1220000.0	967000.0	-1213000.0	461000.0	-143000.0	1514000.0	-505000.0	468000.0	499000.0	333000.0	-301000.0	-966000.0	116000.0	1322000.0	-166000.0	243000.0	1180000.0	418000.0	471000.0	-572000.0	569000.0	84000.0	42000.0
Percentage of IncreaseDecreaseInAccountsReceivable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	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	88	73	69	76	77	70	58	64	63	47	49	51	55	41	42	44	45	31	37	38	35	24	31	36	32	21	30	25	26	14	27	21	21	12	17	12	9.688	7.887	4.109	8.771	1.786
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	64.2	54.8	53.7	64.8	65.9	59.5	52.6	62.8	65.6	49.3	52.7	57.7	64.8	50.4	51.7	56.4	62.7	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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
Value	32	24	96	23	18	63	17	10	13	7.175	45	8.595	14	24	8.656	21	1.412	0.172	33	-0.185	-9.727	11	-19.019	-4.321	-4.831	-1.229	-5.244	0.341	-2.356	0.385	2.098	0.629	0.173	-0.153	-3.372	-3.668	-0.641	-1.942	-2.534	-0.384	-3.903
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	73.9	20.2	16.1	53.5	15.7	10.6	14.2	7.5	48.8	9.7	17.0	29.1	10.7	26.9	2.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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
Value	33	25	98	24	19	65	17	11	14	7.389	47	8.876	14	25	8.924	21	1.368	0.069	34	-0.401	-10.472	11	-20.134	-4.68	-5.228	-1.427	-2.644	0.251	-2.666	0.021	5.21	0.294	-0.184	-0.418	-2.394	-4.916	-1.528	-1.361	-2.756	-0.572	-5.899
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.1	18.9	75.6	20.6	16.4	54.9	16.1	10.9	14.7	7.7	50.7	10.0	17.5	30.2	11.0	27.9	1.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:ProfitLoss dei:LegalEntity

stag:TaxableRealEstateInvestmentTrustSubsidy

Period End	2021-06-30	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
Value	-0.004	0.0	0.0	0.0	0.0	0.0	0.0	0.3	-0.012	0.0	-0.022	-0.039	-0.036	0.0	-0.2	-0.2	-0.031	0.0	-0.1	-0.02	-0.011	-0.018	-0.007
Percentage of ProfitLoss	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	2.1	-0.2	0.0	-0.2	-0.3	-0.1	0.0	-0.9	-14.6	-44.9	0.0	24.9	0.2	-0.1	0.1	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.3	-0.0	0.0	-0.0	-0.0	-0.0	0.0	-0.3	-0.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax stag:TaxableRealEstateInvestmentTrustSubsidy	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

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	32	24	96	23	18	63	17	10	13	7.175	45	8.621	14	21	6.207	18	-1.039	-2.276	30	-4.184	-13.731	8.434	-21.731	-7.033	-7.546	-3.941	-5.126	-2.444	-4.976	-2.327	2.16	-2.083	-2.344	-1.706	-3.469	-5.078	-2.2	-1.942	-2.533	-0.413	-3.903
Percentage of ProfitLoss	97.8	98.1	97.8	98.1	97.9	97.5	97.4	97.4	97.1	97.1	96.3	97.1	97.5	86.5	69.6	85.0	-76.0	-3298.6	86.9	1043.4	131.1	71.5	107.9	150.3	144.3	276.2	193.9	-973.7	186.6	-11081.0	41.5	-708.5	1273.9	408.1	144.9	103.3	144.0	142.7	91.9	72.2	66.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	73.9	20.2	16.1	53.5	15.7	10.6	14.2	7.5	48.8	9.7	17.1	26.1	7.6	23.8	-1.4	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 us-gaap:AccumulatedDistributionsInExcessOfNetIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	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	0.733	0.473	2.177	0.466	0.407	1.598	0.472	0.29	0.408	0.214	1.73	0.255	0.38	0.954	0.268	0.818	-0.042	-0.103	1.574	-0.218	-0.742	0.455	-1.115	-0.359	-0.394	-0.198	-0.23	-0.018	-0.402	-0.364	0.338	-0.335	-0.358	-0.265	-0.476	-1.391	-0.881	-0.972	-1.241	-0.159	-1.996
Percentage of ProfitLoss	2.2	1.9	2.2	1.9	2.1	2.5	2.6	2.6	2.9	2.9	3.7	2.9	2.5	3.8	3.0	3.7	-3.1	-149.3	4.5	54.4	7.1	3.9	5.5	7.7	7.5	13.9	8.7	-7.2	15.1	-1733.3	6.5	-113.9	194.6	63.4	19.9	28.3	57.7	71.4	45.0	27.8	33.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.5	0.4	1.7	0.4	0.3	1.3	0.4	0.3	0.4	0.2	1.9	0.3	0.4	1.1	0.3	1.0	-0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	0.0	0.0	0.0	0.0	0.0	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	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	32	24	96	23	18	63	17	10	13	7.175	45	8.621	14	24	8.656	21	1.41	0.172	33	-0.183	-9.73	11	-19.019	-4.321	-4.834	-1.229	-2.414	0.268	-2.264	0.385	4.872	0.629	0.174	-0.153	-1.918	-3.525	-0.647	-0.389	-1.515	-0.413	-3.903
Percentage of ProfitLoss	97.8	98.1	97.8	98.1	97.9	97.5	97.4	97.4	97.1	97.1	96.3	97.1	97.5	96.2	97.0	96.3	103.1	249.3	95.5	45.6	92.9	96.1	94.5	92.3	92.5	86.1	91.3	106.8	84.9	1833.3	93.5	213.9	-94.6	36.6	80.1	71.7	42.3	28.6	55.0	72.2	66.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	23.6	18.6	73.9	20.2	16.1	53.5	15.7	10.6	14.2	7.5	48.8	9.7	17.1	29.1	10.7	26.9	2.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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

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
Value	4.539	4.615	2.945	2.946	2.938	2.852	2.517	2.556	2.537	2.278	2.251	2.236	2.215	2.22	2.388	2.384	2.388	2.387	2.037	2.043	2.044	3.605	1.911	1.92	1.9	1.847	1.977	1.092	3.155	1.09	0.743	0.742	0.74	0.745	0.479	0.481	0.484	0.492	0.317	0.22	0.156
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

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	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	-122520000.0	-79502000.0	-440580000.0	-58952000.0	-19109000.0	-35980000.0	-456900000.0	-321130000.0	-267730000.0	-176820000.0	-113950000.0	-194320000.0	-162820000.0	-36112000.0	-103340000.0	-94592000.0	-267170000.0	-100950000.0	-127100000.0	-165260000.0	-55359000.0	600000.0	-127180000.0	-98450000.0	-79704000.0	-66705000.0	-133500000.0	-167600000.0	-81769000.0	-38840000.0	-90341000.0	-79916000.0	-92639000.0	-62335000.0	-205890000.0	-100450000.0	-72249000.0	-38615000.0	-42434000.0	-50225000.0	-21799000.0
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-88.5	-59.3	-339.0	-50.3	-16.2	-30.4	-411.0	-313.5	-277.0	-184.8	-122.1	-218.5	-190.5	-43.4	-127.2	-121.0	-370.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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 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	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	29	8.02	316	-56.933	-285.18	294	401	256	201	119	76	136	107	-16.277	74	53	222	64	89	131	12	-21.229	95	63	47	32	121	141	32	46	45	62	79	42	196	93	49	32	42	40	33
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	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	21.5	6.0	243.5	-48.5	-242.5	248.8	360.7	250.4	208.6	124.8	81.6	153.2	126.1	-19.5	92.1	68.9	308.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

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
Value	62	59	55	56	56	54	50	49	47	42	41	41	39	36	37	36	34	32	30	29	29	27	27	27
Percentage of PaymentsOfDividends	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Dividends

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:Dividends

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	2017-09-30	2017-06-30	2017-03-31	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	58	58	56	55	54	54	50	47	46	42	40	39	38	36	36	35	33	31	26	25	24	23	21	19	17	16	15	15	14	11	10	8.292	5.711	5.152	4.133	3.269
Percentage of Dividends	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

stag:LongTermIncentivePlanUnits

Period End	2021-01-07	2020-06-30	2020-01-08	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-01-07	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-12	2018-01-05	2018-03-31	2017-01-06
Value	153430.0	0	136740.0	278810.0	0	0	0	154650.0	364170.0	0	0	0	3930.0	137620.0	324800.0	126240.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	100.0	0.0	100.0	100.0	0.0	0.0	0.0	100.0	100.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType, us-gaap:PlanName

stag:LongTermIncentivePlanUnits, stag:PerformanceUnitsGrantedIn2018

Period End	2021-01-07
Value	124740.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	81.3

us-gaap:RestrictedStock, stag:PerformanceUnitsGrantedIn2018

Period End	2021-01-07
Value	6352.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	4.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType, us-gaap:PlanName, us-gaap:SubsequentEventType

stag:LongTermIncentivePlanUnits, stag:PerformanceUnitsGrantedIn2018, us-gaap:SubsequentEvent

Period End	2021-01-07
Value	124740.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	81.3

us-gaap:RestrictedStock, stag:PerformanceUnitsGrantedIn2018, us-gaap:SubsequentEvent

Period End	2021-01-07
Value	6352.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	4.1

stag:AccruedRentAdjustmentToRentalIncomeResultingFromLeaseCollectibilityAssessment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31	2019-09-30	2019-06-30
Value	0	100000.0	0	800000.0	1200000.0	0	0	0
Percentage of AccruedRentAdjustmentToRentalIncomeResultingFromLeaseCollectibilityAssessment	0.0	100.0	0.0	100.0	100.0	0.0	0.0	0.0

stag:AcquisitionOfOperatingLeaseLiabilities

Period End	2020-12-31
Value	1663000.0
Percentage of AcquisitionOfOperatingLeaseLiabilities	100.0

stag:ContractualRentAdjustmentToRentalIncome

Period End	2021-06-30	2021-03-31
Value	-100000.0	1200000.0
Percentage of ContractualRentAdjustmentToRentalIncome	100.0	100.0

stag:ContractualRentAdjustmentToRentalIncomeResultingFromLeaseCollectibilityAssessment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31	2019-09-30	2019-06-30
Value	300000.0	1400000.0	700000.0	900000.0	600000.0	0	0	0
Percentage of ContractualRentAdjustmentToRentalIncomeResultingFromLeaseCollectibilityAssessment	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0

stag:DebtInstrumentBasisSpreadOnVariableRateFloor us-gaap:DebtInstrument, us-gaap:VariableRate

stag:DebtInstrumentBasisSpreadOnVariableRateFloor

stag:A300MillionUnsecuredTermLoanG, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-02-05
Value	0
Percentage of DebtInstrumentBasisSpreadOnVariableRateFloor	0.0

stag:DividendsandDistributionsNet

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	62	60	57	56	56	55	51	48	48	44	40	40	40	38	37	36	35	33	31	30	29	27	27	27	26	25
Percentage of DividendsandDistributionsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:FairValueInputsDiscountRates

Period End	2020-12-31	2020-09-30	2019-09-30	2019-03-31	2018-12-31
Value	11.0	10.5	13.0	12.0	12.0
Percentage of FairValueInputsDiscountRates	100.0	100.0	100.0	100.0	100.0

stag:FairValueInputsExitCapitalizationRate

Period End	2020-12-31	2020-09-30	2019-09-30	2019-03-31
Value	10.0	10.0	12.0	12.0
Percentage of FairValueInputsExitCapitalizationRate	100.0	100.0	100.0	100.0

stag:ForwardContractIndexedToIssuersEquityForwardRatePerShareNet us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

stag:ForwardContractIndexedToIssuersEquityForwardRatePerShareNet

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-04-05
Value	34.214
Percentage of ForwardContractIndexedToIssuersEquityForwardRatePerShareNet	100.0

stag:GainOnInvoluntaryConversion

Period End	2020-09-30
Value	1500000.0
Percentage of GainOnInvoluntaryConversion	100.0

stag:Netdecreasetorentalincomerelatedtoaboveandbelowmarketleaseamortization

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	330000.0	1480000.0	717000.0	1482000.0	1174000.0	990000.0	1523000.0	1248000.0	1146000.0	967000.0	958000.0	1150000.0	849000.0	1207000.0
Percentage of Netdecreasetorentalincomerelatedtoaboveandbelowmarketleaseamortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:NumberofBuildingsImpaired

Period End	2020-12-31	2020-09-30	2019-09-30	2019-03-31	2018-12-31	2018-03-31
Value	5.0	1.0	5.0	1.0	1.0	1.0
Percentage of NumberofBuildingsImpaired	100.0	100.0	100.0	100.0	100.0	100.0

stag:PaymentToAcquireOperatingLeaseRightOfUseAssets

Period End	2020-12-31
Value	1663000.0
Percentage of PaymentToAcquireOperatingLeaseRightOfUseAssets	100.0

stag:RealEstateTaxesTenantResponsibility

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	5.3	5.1	6.4	5.0	4.9	4.8	6.0	5.1	4.1	3.9	4.1	3.8	4.0	3.1	3.2	2.9	3.0	3.1	3.0	2.7	2.6	2.6	2.4	2.7	2.7	2.5	2.6	2.6	2.5	2.5	2.4	2.4	2.3	2.3	2.0	1.9	1.6	1.5	1.1	1.4	1.0
Percentage of RealEstateTaxesTenantResponsibility	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:RentDeferralsRecognized

Period End	2020-12-31	2020-09-30
Value	200000.0	400000.0
Percentage of RentDeferralsRecognized	100.0	100.0

stag:SaleOfStockGrossConsiderationReceivedOnTransaction us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

stag:SaleOfStockGrossConsiderationReceivedOnTransaction

us-gaap:CommonStock, us-gaap:SubsequentEvent, stag:AtTheMarketProgram2019600Million

Period End	2021-07-27	2021-04-05	2021-05-04
Value	65	50	20
Percentage of SaleOfStockGrossConsiderationReceivedOnTransaction	100.0	100.0	100.0

stag:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue us-gaap:AwardType, us-gaap:SubsequentEventType

stag:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue

us-gaap:RestrictedStock, us-gaap:SubsequentEvent

Period End	2021-01-07
Value	29.77
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue	100.0

stag:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue us-gaap:AwardType

stag:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-01-07	2020-01-08	2019-01-07	2018-03-12	2018-01-05	2017-01-06
Value	4316000.0	4030000.0	3636000.0	90000.0	3447000.0	2924000.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue	100.0	100.0	100.0	100.0	100.0	100.0

stag:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue us-gaap:AwardType, us-gaap:SubsequentEventType

stag:LongTermIncentivePlanUnits, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	4300000.0	4000000.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue	99.6	99.3

stag:SharebasedCompensationbySharebasedPaymentAwardFairValueAssumptionsEstimatedFairValue us-gaap:AwardType

stag:SharebasedCompensationbySharebasedPaymentAwardFairValueAssumptionsEstimatedFairValue

us-gaap:PerformanceShares

Period End	2021-01-07	2020-01-08	2019-01-07	2018-01-05	2017-01-06
Value	5522000.0	5389000.0	5620000.0	5456000.0	2882000.0
Percentage of SharebasedCompensationbySharebasedPaymentAwardFairValueAssumptionsEstimatedFairValue	100.0	100.0	100.0	100.0	100.0

stag:SharebasedCompensationbySharebasedPaymentAwardFairValueAssumptionsEstimatedFairValue us-gaap:AwardType, us-gaap:SubsequentEventType

us-gaap:PerformanceShares, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	5500000.0	5400000.0
Percentage of SharebasedCompensationbySharebasedPaymentAwardFairValueAssumptionsEstimatedFairValue	99.6	100.2

stag:Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedWeightedAverageGrantDateFairValue us-gaap:AwardType

stag:Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-03-31
Value	21.47
Percentage of Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedWeightedAverageGrantDateFairValue	100.0

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities

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	55	48	-28.441	51	58	5.542	40	53	49	39	1.903	42	40	16	33	22	43	31	2.858	38	46	12	51	40	37	23	32	25	28	14	22	21	21	12	20	17	11	9.248	6.865	9.343	7.685
Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:AmortizationOfAboveAndBelowMarketLeases

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	325000.0	1474000.0	712000.0	1477000.0	1168000.0	984000.0	1518000.0	1242000.0	1141000.0	961000.0	958000.0	1150000.0	849000.0	1207000.0	710000.0	1318000.0	1259000.0	1296000.0	1462000.0	1564000.0	1521000.0	1666000.0	2195000.0	2051000.0	2215000.0	2065000.0	1653000.0	1581000.0	1509000.0	1510000.0	2145000.0	1524000.0	1506000.0	1369000.0	1356000.0	1223000.0	1090000.0	1168000.0	1062000.0	845000.0	869000.0
Percentage of AmortizationOfAboveAndBelowMarketLeases	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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

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	2015-12-31	2015-09-30	2015-06-30	2014-12-31	2014-09-30	2012-12-31	2012-09-30	2012-06-30
Value	2.405	3.172	0.0	0.0	0.0	4.413	0.0	5.344	3.248	0.0	0.0	2.934	1.879	0.0	0.0	0.0	5.614	0.0	11	20	5.733	2.645	2.84	0.0	-3.941	3.941	0.622
Percentage of AssetImpairmentCharges	100.0	100.0	0.0	0.0	0.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0

us-gaap:BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual

stag:Acquisitions2020

Period End	2020-09-30	2020-06-30
Value	601000.0	609000.0
Percentage of BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	100.0	100.0

stag:Acquisitions2021

Period End	2021-06-30	2021-03-31
Value	284000.0	23000.0
Percentage of BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	0.0	0.0

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual

stag:Acquisitions2020

Period End	2020-09-30	2020-06-30
Value	3.298	2.807
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	100.0	100.0

stag:Acquisitions2021

Period End	2021-06-30	2021-03-31
Value	2.219	1.287
Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	0.0	0.0

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	2014-06-30	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
Value	7.75	-4.281	-0.256	4.653	-1.763	1.08	-2.546	3.473	6.257	1.094	-1.622	-0.167	3.55	-1.908	-6.076	11	2.957	-1.385	0.872	-0.624	2.968	-1.761	-1.505	1.041	-1.101	1.747	1.713	-0.308	-0.05	0.707	11	0.037	0.817	-0.68	0.588	-0.285	0.86
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

us-gaap:CommonStockDividendsPerShareDeclared

Period End	2021-06-30	2021-05-31	2021-04-30	2021-03-31	2021-02-28	2021-01-31	2020-12-31	2020-11-30	2020-10-31	2020-09-30	2020-08-31	2020-07-31	2020-06-30	2020-05-31	2020-04-30	2020-03-31	2020-02-29	2020-01-31	2019-12-31	2019-11-30	2019-10-15	2019-10-31	2019-09-30	2019-08-31	2019-07-15	2019-07-31	2019-06-30	2019-05-31	2019-04-09	2019-04-30	2019-03-31	2019-02-28	2019-01-10	2019-01-31	2018-12-31	2018-11-30	2018-10-10	2018-10-31	2018-09-30	2018-08-31	2018-07-11	2018-07-31	2018-06-30	2018-05-31	2018-04-10	2018-04-30	2018-03-31	2018-02-28	2018-01-31	2017-11-02	2015-07-21	2015-05-04	2014-12-31	2014-10-30	2013-12-18	2013-12-17	2013-12-31	2012-12-31	2012-09-30	2012-06-30	2011-12-31	2011-09-30	2011-06-30
Value	0.12083	0.12083	0.12083	0.12083	0.12083	0.12083	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11917	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.11833	0.115	0.115	0.11	0.1125	1.26	1.2	0.1	0.27	0.27	0.27	0.26	0.26	0.2057
Percentage of CommonStockDividendsPerShareDeclared	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:CommonStockDividendsPerShareDeclared us-gaap:SubsequentEventType

us-gaap:SubsequentEvent

Period End	2021-07-13	2021-04-12	2021-01-11	2020-10-09	2020-07-09	2020-04-09	2020-01-10	2019-10-15	2019-07-15	2015-10-22
Value	0.12083	0.12083	0.12083	0.12	0.12	0.12	0.12	0.11917	0.11917	0.11583
Percentage of CommonStockDividendsPerShareDeclared	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	0.0

us-gaap:CommonStockDividendsPerShareDeclared us-gaap:TaxPeriod

us-gaap:LatestTaxYear

Period End	2020-12-31
Value	0.12
Percentage of CommonStockDividendsPerShareDeclared	100.0

us-gaap:TaxYear2020

Period End	2020-12-31	2019-12-31
Value	0.07167	0.11917
Percentage of CommonStockDividendsPerShareDeclared	59.7	100.0

us-gaap:CurrentStateAndLocalTaxExpenseBenefit

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	400000.0	400000.0	400000.0	400000.0	500000.0	400000.0	300000.0	300000.0	400000.0	200000.0	300000.0	100000.0	300000.0	200000.0	300000.0	300000.0	200000.0
Percentage of CurrentStateAndLocalTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	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:DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction

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	1895000.0	-879000.0	45000.0	0	958000.0	62000.0	-269000.0	252000.0	-54000.0	116000.0	8000.0	-89000.0	-49000.0	90000.0	45000.0	-171000.0	208000.0	-67000.0	20000.0	-52000.0	-22000.0	80000.0	88000.0	18000.0	-60000.0	-22000.0	243000.0	-57000.0	42000.0	-144000.0
Percentage of DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction	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

us-gaap: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	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	57	58	54	53	53	52	51	46	44	42	42	44	40	39	40	38	36	35	32	32	31	30	30	28	27	26	25	21	20	19	18	17	16	15	14	10	9.272	8.86	7.955	8.332	6.446
Percentage of DepreciationAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:InterestRateSwap

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	-3933000.0	-4400000.0	-4545000.0	-4758000.0	-3240000.0	-896000.0	-349000.0	522000.0	1082000.0	1122000.0	839000.0	512000.0	256000.0	-230000.0	-647000.0	-282000.0	-446000.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	100.0	100.0	100.0	100.0	100.0	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:DirectCostsOfLeasedAndRentedPropertyOrEquipment

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	25	27	26	20	20	21	20	18	16	19	18	17	16	17	15	15	13	13	13	11	11	12	11	10	10	10	9.103	7.694	3.194	4.05	2.935	2.686	2.316	2.707	1.559	1.345	1.353	1.762	1.771	1.35	0.754
Percentage of DirectCostsOfLeasedAndRentedPropertyOrEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations

Period End	2021-06-30	2021-03-31	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	100000.0	-100000.0	-300000.0	-49000.0	-100000.0	-2300000.0	-100000.0	3000.0	-200000.0	700000.0	500000.0	-700000.0	500000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	100.0	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:DisposalGroupHeldforsaleNotDiscontinuedOperations

Period End	2021-06-30	2020-06-30	2020-03-31	2019-03-31	2018-06-30	2017-06-30
Value	100000.0	100000.0	-40000.0	-44000.0	-49000.0	100000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	100.0	-204.1	40.0	22.0	7.0	0.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations

Period End	2021-06-30	2021-03-31	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	0.2	0.01	0.1	0.0	0.0	0.0	0.02	0.007	0.1	3.2	1.5	1.4	1.1
Percentage of DisposalGroupIncludingDiscontinuedOperationRevenue	100.0	100.0	100.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations

Period End	2021-06-30	2020-06-30	2018-06-30	2017-06-30
Value	0.1	0.2	0.037	0.2
Percentage of DisposalGroupIncludingDiscontinuedOperationRevenue	50.0	0.0	2.6	0.0

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsDeclared us-gaap:StatementEquityComponents

us-gaap:DistributionMadeToLimitedPartnerCashDistributionsDeclared

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	2017-09-30	2017-06-30	2017-03-31
Value	4325000.0	1436000.0	-983000.0	1411000.0	2105000.0	-896000.0	-1335000.0	1375000.0	2326000.0	1546000.0	228000.0	1443000.0	1997000.0	1813000.0	1446000.0	1287000.0	1831000.0	1814000.0
Percentage of DistributionMadeToLimitedPartnerCashDistributionsDeclared	100.0	100.0	100.0	100.0	100.0	100.0	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:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStock

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

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	58	58	56	55	54	54	50	47	46	42	40	39	38	34	36	35	36	28
Percentage of DividendsCommonStock	100.0	100.0	100.0	100.0	100.0	100.0	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:EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount

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	1000.0	7000.0	9000.0	8000.0	11000.0	19000.0	26000.0	14000.0	5000.0	11000.0
Percentage of EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForwardContractIndexedToIssuersEquityForwardRate us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:ForwardContractIndexedToIssuersEquityForwardRate

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-04-05
Value	34.56
Percentage of ForwardContractIndexedToIssuersEquityForwardRate	100.0

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

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	5.976	6.409	78	9.06	1.045	46	4.131	1.67	0.317	1.274	39	3.239	6.348	22	5.017	17	1.337	0.325	40	0.643	3.273	17	3.273	1.713	0.0	0.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.0

us-gaap:GainsLossesOnSalesOfInvestmentRealEstate us-gaap:DisposalGroupClassification

us-gaap:GainsLossesOnSalesOfInvestmentRealEstate

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-12-31
Value	6.0	6.4	78
Percentage of GainsLossesOnSalesOfInvestmentRealEstate	100.0	100.0	100.0

us-gaap:ImpairmentOfRealEstate us-gaap:IncomeStatementLocation

us-gaap:ImpairmentOfRealEstate

us-gaap:OperatingIncomeLoss

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30	2019-03-31	2018-12-31	2018-03-31
Value	2.405	3.172	-0.043	4.4	5.344	3.248	2.934
Percentage of ImpairmentOfRealEstate	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

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	5.477	-4.613	-7.881	11	2.853	0.39	-8.405	10	2.342	-3.775	-6.864	8.088	3.881	-2.72	-5.058	6.115	3.914	-4.457	-1.967	6.179	1.43	0.519	-3.352	5.068	3.995	-2.242	-0.408	4.394	2.784	-5.752	2.504	2.57	4.294	-3.325	3.866	2.343	1.65	-1.685	-0.399	2.331	-0.429
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:IncreaseDecreaseInCustomerAdvancesAndDeposits

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	3210000.0	-322000.0	4431000.0	-1129000.0	2990000.0	-441000.0	862000.0	-89000.0	-34000.0	-899000.0	2825000.0	-2108000.0	-440000.0	2831000.0	280000.0	-540000.0	1768000.0	2342000.0	49000.0	611000.0	1192000.0	-1285000.0	1420000.0	1123000.0	441000.0	164000.0
Percentage of IncreaseDecreaseInCustomerAdvancesAndDeposits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

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	5.886	4.132	-2.11	9.522	3.626	0.49	-2.045	7.187	0.652	2.686	-0.676	4.442	-0.376	5.531	-1.376	4.162	0.594	5.723	-2.795	3.682	-0.587	4.28	-1.252	1.224	0.078	3.105	-0.61	1.259	-0.097	2.091	-0.672	-0.022	0.195	1.438	0.083	0.063	0.713	-0.06	0.151	0.506	-0.45
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:IncrementalCommonSharesAttributableToCallOptionsAndWarrants

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	1047000.0	346000.0	-66000.0	233000.0	0	0	-1000.0	19000.0	0	0	0	0
Percentage of IncrementalCommonSharesAttributableToCallOptionsAndWarrants	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:StockCompensationPlan

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	584000.0	350000.0	37000.0	675000.0	364000.0	86000.0	30000.0	178000.0	309000.0	272000.0	6000.0	550000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	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:InterestAndOtherIncome

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	30000.0	32000.0	46000.0	165000.0	156000.0	79000.0	57000.0	12000.0	2000.0	16000.0	4000.0	3000.0	7000.0	6000.0	2000.0	2000.0
Percentage of InterestAndOtherIncome	100.0	100.0	100.0	100.0	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:LeaseCost

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	846000.0	846000.0	844000.0	769000.0	754000.0	649000.0	597000.0	597000.0	598000.0	597000.0
Percentage of LeaseCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LeaseCost us-gaap:IncomeStatementLocation

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
Value	429000.0	429000.0	427000.0	424000.0	423000.0	318000.0	266000.0	266000.0	267000.0	266000.0
Percentage of LeaseCost	50.7	50.7	50.6	55.1	56.1	49.0	44.6	44.6	44.6	44.6

us-gaap:OperatingExpense

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	417000.0	417000.0	417000.0	345000.0	331000.0	331000.0	331000.0	331000.0	331000.0	331000.0
Percentage of LeaseCost	49.3	49.3	49.4	44.9	43.9	51.0	55.4	55.4	55.4	55.4

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest us-gaap:Ownership

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest

stag:STAGIndustrialInc

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	0	97.8	0.2	96.823	0.002	0.975
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LineOfCreditFacilityCommitmentFeeAmount us-gaap:IncomeStatementLocation

us-gaap:LineOfCreditFacilityCommitmentFeeAmount

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
Value	440000.0	386000.0	316000.0	315000.0	316000.0	364000.0	395000.0	348000.0	387000.0	383000.0	318000.0	275000.0	314000.0	339000.0	330000.0	286000.0	278000.0
Percentage of LineOfCreditFacilityCommitmentFeeAmount	100.0	100.0	100.0	100.0	100.0	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:NoncashOrPartNoncashAcquisitionDebtAssumed1

Period End	2021-06-30	2021-03-31	2017-12-31	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	0.0	5.103	0.0	0.0	4.037	0.0	0.0	3.924	5.719	4.859	11	4.198
Percentage of NoncashOrPartNoncashAcquisitionDebtAssumed1	0.0	100.0	0.0	0.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0

us-gaap:NoncashOrPartNoncashAcquisitionDebtAssumed1 us-gaap:BusinessAcquisition

stag:RonkonkomaNY22521

Period End	2021-02-25
Value	5.1
Percentage of NoncashOrPartNoncashAcquisitionDebtAssumed1	0.0

us-gaap:NoncashOrPartNoncashAcquisitionDebtAssumed1 us-gaap:BusinessAcquisition, us-gaap:DebtInstrument

stag:RonkonkomaNY22521, stag:UnitedOfOmahaLifeInsuranceCompany

Period End	2021-02-25
Value	5.1
Percentage of NoncashOrPartNoncashAcquisitionDebtAssumed1	0.0

us-gaap:NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1

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	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	2014-12-31	2013-12-31
Value	0.0	4.239	1.72	0.371	0.397	0.0	0.608	0.232	0.157	0.318	16	0.0	0.18	3.218	0.135	0.039	-16.308	5.629	23
Percentage of NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	0.0	100.0	100.0	100.0	100.0	0.0	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

us-gaap:NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1

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	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	0.0	0.703	0.256	0.073	0.064	0.0	0.0	0.048	0.015	0.063	2.001	0.0	0.07	0.894	0.028	0.016	6.17	-3.911	1.209	7.731	0.593
Percentage of NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0.0	100.0	100.0	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	100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

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	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	-1.186	-0.474	-1.249	0.704	0.109	-3.293	-2.52	-1.719	-3.799	-4.849	0.104	-1.122	-3.253	-2.059	-0.906	-0.275	6.155	-2.248	-3.55	-1.636	0.449	1.12	1.577	1.061	-1.509	10
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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: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	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	1.186	0.474	1.249	-0.704	-0.109	3.293	2.52	1.719	3.799	4.849	-0.104	1.122	3.253	2.059	0.906	0.275	-6.155	2.248	3.55	1.636	-0.449	-1.12	-1.577	-1.061	1.509	-10.589
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-100.0	-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: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	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	-1.186	-0.474	-1.249	0.704	0.109	-3.293	-2.52	-1.719	-3.799	-4.849	0.104	-1.122	-3.253	-2.059	-0.906	-0.275	6.155	-2.248	-3.55	-1.636	0.449	1.12	1.577	1.061	-1.509	10
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:NotesAssumed1

Period End	2021-06-30	2021-03-31
Value	0	161000.0
Percentage of NotesAssumed1	0.0	100.0

us-gaap:OperatingLeaseLeaseIncome

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	137	133	129	117	117	118	111	102	96	95	93	88	84	83
Percentage of OperatingLeaseLeaseIncome	100.0	100.0	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:OperatingLeaseLeaseIncomeLeasePayments

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	103	101	97	92	91	90	86	80	74	72
Percentage of OperatingLeaseLeaseIncomeLeasePayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

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	325000.0	627000.0	627000.0	585000.0	572000.0	571000.0	571000.0	570000.0	572000.0	569000.0
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:OperatingLeaseVariableLeaseIncome

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	29	29	29	23	25	25	23	20	19	22
Percentage of OperatingLeaseVariableLeaseIncome	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

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	1.432	12	5.164	4.927	-2.009	-30.191	5.816	-6.435	-16.028	-6.978	-12.501	2.06	3.028	7.723	5.37	0.598	-1.51	1.212	14	2.863	-5.068	-11.823	5.063	-7.636	4.621	-4.005	-2.238	1.3	-2.177	-1.082
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

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	31000.0	268000.0	134000.0	145000.0	-32000.0	-757000.0	212000.0	-176000.0	-510000.0	-244000.0	-497000.0	76000.0	122000.0	325000.0	225000.0	26000.0	-62000.0	52000.0	753000.0	140000.0	-261000.0	-606000.0	248000.0	-371000.0	232000.0	-192000.0	-122000.0	47000.0	-125000.0	-146000.0	239000.0	-143000.0	482000.0	1000.0	41000.0	-111000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:InterestRateSwap

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	-2.501	7.75	-71.715	-0.169	5.249	31	5.467	-5.913	-14.946	-5.856	-11.662	2.572	3.284	7.493	4.723	0.316	-1.956
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	100.0	100.0	100.0	100.0	100.0	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:OtherExpenses

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	511000.0	852000.0	529000.0	436000.0	588000.0	476000.0	501000.0	458000.0	427000.0	399000.0	413000.0	223000.0	350000.0	291000.0	284000.0	58000.0	1250000.0	194000.0	292000.0	279000.0	318000.0	260000.0	156000.0	226000.0	478000.0	186000.0	192000.0	181000.0	193000.0	237000.0	285000.0	89000.0	161000.0	85000.0	193000.0	87000.0	9000.0	50000.0
Percentage of OtherExpenses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:OtherNonrecurringGain

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	0	1500000.0	657000.0	0
Percentage of OtherNonrecurringGain	0.0	100.0	100.0	0.0

us-gaap:OtherNonrecurringGain us-gaap:IncomeStatementLocation

us-gaap:OperatingIncomeLoss

Period End	2020-12-31	2020-09-30	2020-06-30
Value	0	1500000.0	700000.0
Percentage of OtherNonrecurringGain	0.0	100.0	106.5

us-gaap:OtherOperatingIncome

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	622000.0	170000.0	183000.0	48000.0	146000.0	209000.0	102000.0	127000.0	284000.0	87000.0	267000.0	269000.0	608000.0	156000.0	7000.0	105000.0
Percentage of OtherOperatingIncome	100.0	100.0	100.0	100.0	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:PaidInKindInterest

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	789000.0	487000.0	750000.0	750000.0	746000.0	676000.0	674000.0	673000.0	618000.0	618000.0	618000.0	617000.0	547000.0	534000.0	432000.0	485000.0	635000.0	345000.0	424000.0	428000.0	401000.0	379000.0	355000.0	400000.0	208000.0	299000.0	328000.0	351000.0	343000.0	315000.0	298000.0
Percentage of PaidInKindInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PaymentsForCapitalImprovements

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	8.644	10	16	12	10	16	24	21	13	5.058	11	9.968	7.293	6.317	18	13	8.223	6.015	9.782	9.502	7.533	3.668	6.276	5.459	1.95	2.644	112	136	64	31	77	63	72	47	165	72	56	30	30	36	12
Percentage of PaymentsForCapitalImprovements	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PaymentsForProceedsFromDepositsOnRealEstateAcquisitions

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	2885000.0	-2008000.0	-1151000.0	1784000.0	-160000.0	-500000.0	-5036000.0	3332000.0	-5139000.0	2997000.0	4221000.0	-210000.0	300000.0	605000.0	430000.0	135000.0	-1465000.0	645000.0	-755000.0	759000.0	723000.0	-167000.0	5000.0	-330000.0	-1575000.0	480000.0
Percentage of PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PaymentsForRepurchaseOfRedeemablePreferredStock

Period End	2021-06-30	2021-03-31	2019-12-31	2018-12-31	2017-12-31
Value	0.0	75	0.0	0.0	0.0
Percentage of PaymentsForRepurchaseOfRedeemablePreferredStock	0.0	100.0	0.0	0.0	0.0

us-gaap:PaymentsOfDebtExtinguishmentCosts

Period End	2020-12-31	2020-09-30	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	0	0	13000.0	2000.0	0	1309000.0	0	839000.0	1130000.0	0
Percentage of PaymentsOfDebtExtinguishmentCosts	0.0	0.0	0.0	100.0	100.0	0.0	100.0	0.0	100.0	100.0	0.0

us-gaap:PaymentsOfFinancingCosts

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	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	97000.0	2750000.0	0	0	1000.0	1178000.0	48000.0	0	14000.0	3378000.0	1070000.0	3000.0	39000.0	1127000.0	8000.0	35000.0	575000.0	67000.0	16000.0	57000.0	653000.0	1981000.0	108000.0	930000.0	2713000.0	332000.0	217000.0	1169000.0	438000.0	24000.0	14000.0	1473000.0	1286000.0	2356000.0	353000.0	124000.0	368000.0	367000.0	2662000.0
Percentage of PaymentsOfFinancingCosts	100.0	100.0	0.0	0.0	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

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	2014-12-31
Value	0	1342000.0	31000.0	0	0	1472000.0	158000.0	0	0	1444000.0	0	0	0	1524000.0	0	0	0	969000.0	0	0	0	0	0	0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0.0	100.0	100.0	0.0	0.0	100.0	100.0	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	0.0	0.0	0.0

us-gaap:PaymentsToAcquireCommercialRealEstate

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	112	81	499	51	9.934	100	378	248	208	159	181	160	155	67	91	102	218	84	181	125	49	21	104	78	60	48
Percentage of PaymentsToAcquireCommercialRealEstate	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PaymentsToAcquireIntangibleAssets

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	14	13	78	12	1.836	18	76	52	51	24	35	33	30	11	15	17	47	15	37	36	8.421	6.571	29	23	18	14	26	35	17	7.54	22	16	24	13	46	28	17	8.492	16	12	5.686
Percentage of PaymentsToAcquireIntangibleAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PaymentsToAcquireOtherReceivables

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
Value	0	0	0	450000.0	223000.0	1464000.0	0	1049000.0	0	794000.0	0	0	0
Percentage of PaymentsToAcquireOtherReceivables	0.0	0.0	0.0	100.0	100.0	100.0	0.0	100.0	0.0	100.0	0.0	0.0	0.0

us-gaap:PreferredStockDividendRatePercentage us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendRatePercentage

us-gaap:SeriesCPreferredStock

Period End	2021-06-30	2021-03-31	2020-12-31	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	2016-03-17	2016-03-31
Value	0	6.875	0	0	0	0.06875	0	0	0	0.06875	0	0	0	0.06875	0.06875
Percentage of PreferredStockDividendRatePercentage	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	100.0

us-gaap:PreferredStockDividendsPerShareDeclared us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendsPerShareDeclared

us-gaap:SeriesCPreferredStock

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	2018-02-14	2018-03-31	2017-11-02	2017-12-31	2017-07-31	2017-09-30	2017-05-01	2017-06-30	2017-02-15	2017-03-31	2016-11-02	2016-12-31	2016-08-01	2016-09-30	2016-05-02	2016-02-22
Value	0	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.49653	0
Percentage of PreferredStockDividendsPerShareDeclared	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	0.0

us-gaap:PreferredStockDividendsPerShareDeclared us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:SeriesCPreferredStock, us-gaap:SubsequentEvent

Period End	2021-01-11	2020-10-09	2020-07-09	2020-04-09	2020-01-10	2019-10-15	2019-07-15	2018-07-11	2018-04-10	2018-02-14	2017-11-02	2017-07-31	2017-05-01	2017-02-15	2016-11-02	2016-08-01	2016-05-02
Value	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.42969	0.49653
Percentage of PreferredStockDividendsPerShareDeclared	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PreferredStockRedemptionPremium

Period End	2021-06-30	2021-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2017-09-30	2017-06-30
Value	0	2582000.0	0	0	0	0	0	2661000.0	0	0	0
Percentage of PreferredStockRedemptionPremium	0.0	100.0	0.0	0.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0

us-gaap:PreferredStockRedemptionPremium us-gaap:StatementClassOfStock

us-gaap:SeriesCPreferredStock

Period End	2021-03-31
Value	2600000.0
Percentage of PreferredStockRedemptionPremium	100.7

us-gaap:ProceedsFromInsuranceSettlementInvestingActivities

Period End	2020-12-31	2020-09-30	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	0	0	0	0	0	0	939000.0	218000.0	200000.0	439000.0	0	0	0	0
Percentage of ProceedsFromInsuranceSettlementInvestingActivities	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:ProceedsFromIssuanceOfCommonStock

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	2011-06-30
Value	41	21	265	-0.021	-0.145	172	283	183	234	150	113	99	176	0.0	87	65	205	68	181	100	0.0	0.0	0.0	3.065	61	10	152	44	41	77	15	36	0.2	117	5.379	130	205
Percentage of ProceedsFromIssuanceOfCommonStock	100.0	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	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

us-gaap:ProceedsFromIssuanceOfOtherLongTermDebt

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	300	0.0	0.0	300	100	100	175	0.0	0.0	0.0	75	0.0	75	0.0	0.0	0.0	0.0
Percentage of ProceedsFromIssuanceOfOtherLongTermDebt	0.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	100.0	0.0	0.0	0.0	0.0

us-gaap:ProceedsFromSaleOfBuildings

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
Value	15	23	152	19	2.203	99	18	6.012	1.086	16	118	9.706	30	49	21	33	6.39	3.919	101	1.631	16	31	12	9.186
Percentage of ProceedsFromSaleOfBuildings	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:ProceedsFromSaleOfRealEstateHeldforinvestment us-gaap:DisposalGroupClassification

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-12-31
Value	15	23	152
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment	100.0	100.0	100.0

us-gaap:ProceedsFromUnsecuredLinesOfCredit

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
Value	372	393	527	0.0	0.0	387	800	387	173	208	251	394	139	110	139	182	215	141	227	134	98	54	110	90	38	62	239	136	13	38	68	25	45	20	203
Percentage of ProceedsFromUnsecuredLinesOfCredit	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RepaymentsOfLinesOfCredit

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	2011-09-30	2011-06-30
Value	321	267	420	0.0	225	308	732	438	159	193	246	316	340	163	113	67	156	98	328	69	40	104	231	0.0	24	120	214	65	0.0	96	8.0	5.0	65	99	-8.3	42	0.0	11
Percentage of RepaymentsOfLinesOfCredit	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	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	0.0	100.0

us-gaap:RepaymentsOfOtherLongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	0.0	300	0.0	0.0
Percentage of RepaymentsOfOtherLongTermDebt	0.0	100.0	0.0	0.0

us-gaap:RepaymentsOfSecuredDebt

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	0.562	0.531	0.498	0.492	1.496	0.497	0.485	0.48	0.48	0.481	0.464	0.457	0.46	0.462	0.443	87	4.866	12	37	1.129	15	16	5.201	1.246	1.182	12	1.142	1.113	1.107	1.101	1.068	1.186	0.92	1.045	0.768	125	16	1.971	6.526	1.165	152
Percentage of RepaymentsOfSecuredDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	0	0	0	7718000.0	0	0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0.0	0.0	0.0	100.0	0.0	0.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction

Period End	2020-12-23	2020-01-16	2020-01-13	2019-12-26	2019-09-27	2019-04-04
Value	135	173	173	202	157	214
Percentage of SaleOfStockConsiderationReceivedOnTransaction	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-06-30	2021-03-31	2019-12-31	2019-09-30
Value	41	21	82	26
Percentage of SaleOfStockConsiderationReceivedOnTransaction	0.0	0.0	0.0	0.0

us-gaap:SaleOfStockConsiderationReceivedOnTransaction us-gaap:StatementEquityComponents

us-gaap:Warrant

Period End	2020-12-23
Value	131
Percentage of SaleOfStockConsiderationReceivedOnTransaction	97.2

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost us-gaap:RetirementPlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost

stag:EmployeeRetirementVestingProgram

Period End	2021-06-30	2021-03-31
Value	1400000.0	1500000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost us-gaap:StatementScenario, us-gaap:RetirementPlanName

srt:ScenarioForecast, stag:EmployeeRetirementVestingProgram

Period End	2022-03-31
Value	2400000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStock

Period End	2020-12-31
Value	0.77
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-06-30	2021-01-07	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-01-08	2020-03-31	2019-01-07	2018-03-12	2018-01-05	2017-01-06
Value	0	28.13	28.13	0	0	0	29.47	29.47	23.51	22.9	25.05	23.16
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	100.0	100.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedStock

Period End	2021-06-30	2021-01-07	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-02-13	2020-01-08	2020-03-31	2019-01-07	2018-01-05	2017-01-06
Value	0	29.77	29.77	0	0	0	32.64	31.49	31.6	24.85	26.4	24.41
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.0	105.8	105.8	0.0	0.0	0.0	107.2	0.0	106.9	105.7	105.4	105.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue

stag:LongTermIncentivePlanUnits

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	1.686	5.683	2.899	0.832	1.213	3.861	4.272	0.884	1.401	4.063	0.77	0.851	2.116	6.035	1.955	1.235	1.248	1.664
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	100.0	100.0	100.0	100.0	100.0	100.0	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: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
Value	0.0	2.28	0.105	0.0	0.0	2.463	0.707	0.0	0.0	1.951	0.0	0.0	0.0	3.002	0.0	0.0	0.0	2.591
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	0.0	40.1	3.6	0.0	0.0	63.8	16.5	0.0	0.0	48.0	0.0	0.0	0.0	49.7	0.0	0.0	0.0	155.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	-0.75	28.08	0.64	-0.15	-0.99	27.37
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	0	26.76	0.35	0	0	23.11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	-0.0	95.3	54.7	-0.0	-0.0	84.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

stag:LongTermIncentivePlanUnits

Period End	2021-01-07	2020-01-08	2019-01-07	2018-03-12	2018-01-05	2017-01-06
Value	5.0	0.0575	0.06	0.06	0.06	0.06
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PerformanceShares

Period End	2021-01-07	2020-01-08	2019-01-07	2018-01-05	2017-01-06
Value	5.0	0.0575	0.06	0.06	0.06
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap:AwardType, us-gaap:SubsequentEventType

stag:LongTermIncentivePlanUnits, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	5.0	0.0575
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	100.0	100.0

us-gaap:PerformanceShares, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	5.0	0.0575
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

stag:LongTermIncentivePlanUnits

Period End	2021-01-07	2020-01-08	2019-01-07	2018-03-12	2018-01-05	2017-01-06
Value	34.0	0.18	0.19	0.22	0.22	0.23
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PerformanceShares

Period End	2021-01-07	2020-01-08	2019-01-07	2018-01-05	2017-01-06
Value	34.4	0.174	0.207	0.22	0.23
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	101.2	96.7	108.9	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType, us-gaap:SubsequentEventType

stag:LongTermIncentivePlanUnits, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	34.0	0.18
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	100.0	100.0

us-gaap:PerformanceShares, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	34.4	0.174
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	101.2	96.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

stag:LongTermIncentivePlanUnits

Period End	2021-01-07	2020-01-08	2019-01-07	2018-03-12	2018-01-05	2017-01-06
Value	0.229	0.0161	0.0257	0.0246	0.0209	0.0161
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PerformanceShares

Period End	2021-01-07	2020-01-08	2019-01-07	2018-01-05	2017-01-06
Value	0.2271	0.0159	0.0256	0.0209	0.0161
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	99.2	98.8	99.6	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType, us-gaap:SubsequentEventType

stag:LongTermIncentivePlanUnits, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	0.229	0.0161
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	100.0	100.0

us-gaap:PerformanceShares, us-gaap:SubsequentEvent

Period End	2021-01-07	2020-01-08
Value	0.2271	0.0159
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	99.2	98.8

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:CommonStock, us-gaap:SubsequentEvent, stag:AtTheMarketProgram2019600Million

Period End	2021-07-27	2021-05-04
Value	1.719849	0.602316
Percentage of StockIssuedDuringPeriodSharesNewIssues	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-06-30	2021-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1.208014	0.680276	2.689374	0.875129	0.705794	5.441409
Percentage of StockIssuedDuringPeriodSharesNewIssues	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

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	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2015-12-31	2015-09-30	2014-12-31	2014-09-30	2013-12-31	2013-09-30	2012-12-31	2012-09-30
Value	0.368	1.622	0.005	4.453	3.656	3.426	0.283	3.001	0.207	6.024	0.0	0.261	2.314	1.823	0.615	0.047	1.675	1.592	0.0	0.0	0.0	0.0	0.256	0.0	0.0	5.449	7.11
Percentage of StockIssuedDuringPeriodValueConversionOfUnits	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	100.0	0.0	0.0	0.0	0.0	100.0	0.0	0.0	100.0	100.0

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	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2015-12-31	2015-09-30	2014-12-31	2014-09-30	2012-12-31	2012-09-30
Value	0.0	0.001	0.0	0.003	0.002	0.002	0.0	0.002	0.0	0.004	0.0	0.0	0.002	0.001	0.0	0.0	0.002	0.001	0.0	0.0	0.0	0.0	0.0	0.005	0.007
Percentage of StockIssuedDuringPeriodValueConversionOfUnits	0.0	0.1	0.0	0.1	0.1	0.1	0.0	0.1	0.0	0.1	0.0	0.0	0.1	0.1	0.0	0.0	0.1	0.1	0.0	0.0	0.0	0.0	0.0	0.1	0.1

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	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2015-12-31	2015-09-30	2014-12-31	2014-09-30	2013-12-31	2013-09-30	2012-12-31	2012-09-30
Value	0.368	1.623	0.005	4.456	-3.658	3.428	-0.283	-3.003	-0.207	-6.028	0.0	-0.261	-2.316	-1.824	-0.615	-0.047	-1.677	-1.593	0.0	0.0	0.0	0.0	-0.256	0.0	0.0	-5.454	-7.117
Percentage of StockIssuedDuringPeriodValueConversionOfUnits	100.0	100.1	100.0	100.1	-100.1	100.1	-100.0	-100.1	-100.0	-100.1	0.0	-100.0	-100.1	-100.1	-100.0	-100.0	-100.1	-100.1	0.0	0.0	0.0	0.0	-100.0	0.0	0.0	-100.1	-100.1

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	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2015-12-31	2015-09-30	2014-12-31	2014-09-30	2013-12-31	2013-09-30	2012-12-31	2012-09-30
Value	0.368	1.623	0.005	4.456	3.658	3.428	0.283	3.003	0.207	6.028	0.0	0.261	2.316	1.824	0.615	0.047	1.677	1.593	0.0	0.0	0.0	0.0	0.256	0.0	0.0	5.454	7.117
Percentage of StockIssuedDuringPeriodValueConversionOfUnits	100.0	100.1	100.0	100.1	100.1	100.1	100.0	100.1	100.0	100.1	0.0	100.0	100.1	100.1	100.0	100.0	100.1	100.1	0.0	0.0	0.0	0.0	100.0	0.0	0.0	100.1	100.1

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

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	121000.0	0	0	0	390000.0	32000.0	0	0	373000.0	0	0	0	537000.0	0	0	0	194000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	0.0	100.0	0.0	0.0	0.0	100.0	100.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	100.0

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	2017-09-30	2017-06-30	2017-03-31	2014-12-31
Value	0	1000.0	0	0	0	1000.0	0	0	0	1000.0	0	0	0	1000.0	0	0	0	0	0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	0.0	0.8	0.0	0.0	0.0	0.3	0.0	0.0	0.0	0.3	0.0	0.0	0.0	0.2	0.0	0.0	0.0	0.0	0.0

us-gaap:StockRedeemedOrCalledDuringPeriodValue

Period End	2021-06-30	2021-03-31	2018-12-31	2018-09-30	2018-06-30
Value	0.0	75	0.0	0.0	70
Percentage of StockRedeemedOrCalledDuringPeriodValue	0.0	100.0	0.0	0.0	100.0

us-gaap:StockRedeemedOrCalledDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

Period End	2021-06-30	2021-03-31	2018-12-31	2018-09-30	2018-06-30
Value	0.0	2.582	0.0	0.0	5.158
Percentage of StockRedeemedOrCalledDuringPeriodValue	0.0	3.4	0.0	0.0	7.4

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2018-12-31	2018-09-30	2018-06-30
Value	0.0	2.573	0.0	0.0	5.141
Percentage of StockRedeemedOrCalledDuringPeriodValue	0.0	3.4	0.0	0.0	7.3

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2018-12-31	2018-09-30	2018-06-30
Value	0.0	75	0.0	0.0	70
Percentage of StockRedeemedOrCalledDuringPeriodValue	0.0	100.0	0.0	0.0	100.0

us-gaap:PreferredStock

Period End	2021-06-30	2021-03-31	2018-12-31	2018-09-30	2018-06-30
Value	0.0	75	0.0	0.0	70
Percentage of StockRedeemedOrCalledDuringPeriodValue	0.0	100.0	0.0	0.0	100.0

us-gaap:StraightLineRent

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	4.211	4.676	3.904	2.672	1.649	3.849	3.188	3.064	3.266	2.256	2.866	2.848	2.668	2.781	2.62	2.077	1.811	0.967	-0.388	0.912	0.869	0.424	0.816	-0.39	1.415	1.293	1.033	0.692	0.598	1.024	0.802
Percentage of StraightLineRent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:StraightLineRentAdjustments

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	-4718000.0	-4882000.0	-4109000.0	-2852000.0	-1823000.0	-3927000.0	-3214000.0	-3091000.0	-3292000.0	-2284000.0
Percentage of StraightLineRentAdjustments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

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	2014-06-30	2014-03-31
Value	74000.0	73000.0	67000.0	68000.0	68000.0	79000.0	78000.0	78000.0	79000.0	79000.0	67000.0	69000.0	69000.0	71000.0	84000.0	84000.0	83000.0	83000.0	95000.0	95000.0	95000.0	100000.0	94000.0	95000.0	95000.0	101000.0	87000.0	87000.0	83000.0	88000.0
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	100.0	100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument

us-gaap:WriteOffOfDeferredDebtIssuanceCost

stag:A300MillionUnsecuredTermLoanG

Period End	2021-06-30	2021-03-31	2020-04-17
Value	0	700000.0	700000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost	0.0	100.0	100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument, us-gaap:IncomeStatementLocation

stag:A300MillionUnsecuredTermLoanG, us-gaap:InterestExpense

Period End	2021-06-30	2021-03-31
Value	0	300000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost	0.0	42.9

dei:EntityCommonStockSharesOutstanding

Period End	2021-07-26	2021-05-03	2020-11-04	2020-07-27	2020-04-29	2019-10-29
Value	162	159	149	149	148	132
Percentage of EntityCommonStockSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances

Period End	2020-12-31	2019-12-31	2018-12-31
Value	52	55	57
Percentage of RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	100.0	100.0	100.0

srt:RealEstateFederalIncomeTaxBasis

Period End	2020-12-31
Value	5500
Percentage of RealEstateFederalIncomeTaxBasis	100.0

stag:BusinessAcquisitionPurchasePriceAllocationBuildingAndLandImprovements

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31
Value	9.435	3.947	41	8.895	69	33	19	5.255	1.262	9.133	5.47	3.897	1.537	7.488
Percentage of BusinessAcquisitionPurchasePriceAllocationBuildingAndLandImprovements	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetBeforeDebtIncurred

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31
Value	226	100	775	195	1203	676
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetBeforeDebtIncurred	100.0	100.0	100.0	100.0	100.0	100.0

stag:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeaseholdImprovements

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31
Value	1.575	0.757	7.388	2.096	12	6.684
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLeaseholdImprovements	100.0	100.0	100.0	100.0	100.0	100.0

stag:CommonStockValueAvailableForIssuanceUnderStockOfferingProgram us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

stag:CommonStockValueAvailableForIssuanceUnderStockOfferingProgram

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	204	296	318	318
Percentage of CommonStockValueAvailableForIssuanceUnderStockOfferingProgram	100.0	100.0	100.0	100.0

stag:DerivativeNotionalAmountSwapped us-gaap:DerivativeInstrumentRisk

stag:DerivativeNotionalAmountSwapped

us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	2020-09-30	2020-03-31
Value	975	975	975	775
Percentage of DerivativeNotionalAmountSwapped	100.0	100.0	100.0	100.0

stag:Derivativenotionalamountswapped us-gaap:DerivativeInstrumentRisk

stag:Derivativenotionalamountswapped

us-gaap:InterestRateSwap

Period End	2020-12-31
Value	975
Percentage of Derivativenotionalamountswapped	100.0

stag:ImpairedRealEstateAssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

stag:ImpairedRealEstateAssetsFairValueDisclosure

us-gaap:FairValueMeasurementsNonrecurring

Period End	2020-12-31	2020-09-30	2019-09-30	2019-03-31	2018-12-31	2018-03-31
Value	1252000.0	5019000.0	5950000.0	4373000.0	4322000.0	3176000.0
Percentage of ImpairedRealEstateAssetsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0

stag:LeaseSecurityDepositsAvailableInLettersOfCredit

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	2011-12-31
Value	29	29	30	28	28	28	22	20	18	18	18	14	13	12	12	12	11	10	9.0	6.9	5.9	6.1	6.1	6.2	6.2	6.3	6.7	5.3	5.0	4.8	4.9	4.9	4.9	5.4	4.8	3.3	3.3	3.6
Percentage of LeaseSecurityDepositsAvailableInLettersOfCredit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:RealEstateAccumulatedDepreciationExcludingHeldforSale

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	495	387	316	249	187	147
Percentage of RealEstateAccumulatedDepreciationExcludingHeldforSale	100.0	100.0	100.0	100.0	100.0	100.0

stag:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAndValuationProvision

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
Value	196	158	121	99	63	42	32	20	15
Percentage of RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAndValuationProvision	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:RealEstateExcludingHeldforSale

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	4520	3910	2966	2503	2009	1711
Percentage of RealEstateExcludingHeldforSale	100.0	100.0	100.0	100.0	100.0	100.0

stag:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue us-gaap:AwardType

stag:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2020-12-31	2019-12-31	2019-01-01
Value	23.49	21.64	20.5
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue	100.0	100.0	100.0

stag:Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue us-gaap:AwardType

stag:Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2020-01-01
Value	24.53	23.49	23.49	23.19	23.19	21.64
Percentage of Stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

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	65	60	69	74	58	55	53	63	49	41	45	53	45	38	43	54	37	30	35	34	29	28	25	29	23	17	21	24	17	12	18	16	12	8.832	12	8.179	5.754	4.644	6.044	6.003	3.253
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:AccountsReceivableNet

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	83	79	77	66	65	62	57	50	45	44	42	39	35	34	33	30	26	26	25	23	21	22	21	20	19	18	16	15	14	13	13	12	10	10	9.351	7.1	6.21	5.71	5.592	4.808	4.229
Percentage of AccountsReceivableNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:AreaOfRealEstateProperty

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	2016-11-02	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2011-12-31
Value	100	99	98	92	91	91	91	86	81	78	76	75	72	70	70	69	67	63	60	1.9	58	55	54	54	52	50	48	47	3.106233	0.975275	9.028388	5.955086	4.006826	1.806546	12	23	20	11
Percentage of AreaOfRealEstateProperty	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:AssetsNeededForImmediateSettlementAggregateFairValue us-gaap:DerivativeInstrumentRisk

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue

us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	27	29	41	46
Percentage of AssetsNeededForImmediateSettlementAggregateFairValue	100.0	100.0	100.0	100.0

us-gaap:BelowMarketLeaseAccumulatedAmortization

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	17	16	15	14	13	13	12	11	10	10	12	13	11	11	13	12	12	11	10	10	9.304	8.514	8.536	8.397	7.916	7.242	6.565	5.875	4.52
Percentage of BelowMarketLeaseAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:BelowMarketLeaseGross

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	2014-12-31
Value	50	49	48	39	39	41	38	31	31	30	34	33	32	32	34	33	34	31	30	25	23	19	19	16
Percentage of BelowMarketLeaseGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:BelowMarketLeaseNet

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	32	33	32	24	26	27	26	20	20	20	21	20	20	20	21	21	21	19	20	14	14	10	11	10	10	10	10	7.586	6.914
Percentage of BelowMarketLeaseNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	165	71	546	135	814	465	253	73	23	223	269
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther

Period End	2020-12-31	2020-09-30	2019-12-31	2018-12-31
Value	450000.0	450000.0	2736000.0	794000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets

Period End	2020-12-31	2019-12-31	2018-12-31
Value	669000.0	2032000.0	0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets	100.0	100.0	0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ConstructionInProgress

Period End	2020-09-30
Value	669000.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets	0.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles

us-gaap:AboveMarketLeases

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	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	2.279	1.975	8.779	3.962	1.069	0.901	27	19	13	0.327	10	7.249	2.837	0.59	8.219	16
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	100.0	100.0	100.0	100.0	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:CustomerRelationships

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	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	9.761	4.704	37	10	7.115	6.589	60	36	19	8.404	32	28	7.706	2.611	21	26
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	428.3	238.2	428.3	256.2	665.6	731.3	218.2	185.1	144.1	2570.0	312.8	397.4	271.6	442.5	258.6	156.9

us-gaap:LeasesAcquiredInPlace

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	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	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	20	9.813	76	21	14	13	128	76	45	16	77	62	51	40	9.342	62	36	11	3.99	58	57	16	5.648	50	63
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	886.6	496.9	875.7	542.6	1399.7	1530.3	461.1	394.0	337.1	5120.2	750.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	789.1	592.1	957.3	608.4	379.0

us-gaap:LeasesAcquiredInPlaceMarketAdjustment

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	-3.861	-2.633	-12.061	-2.687	-2.572	-2.572	-11.023	-3.229	-2.161	-1.129	-10.11
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	-169.4	-133.3	-137.4	-67.8	-240.6	-285.5	-39.6	-16.6	-16.0	-345.3	-97.5

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	21	9.766	67	15	96	59	58	11	4.373	31	34
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet

Period End	2021-06-30	2021-03-31	2014-12-31	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	221	95	425	117	36	343	423
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

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	2016-12-31	2015-12-31
Value	18	22	20	74	114	341	11	9.273	9.595	12	22	11	18	17	28	14	16	21	20
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:CustomerAdvancesAndDeposits

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	30	27	27	23	24	21	21	21	21	21	22	19	21	21	19	18	19	17	15	15	14	13	14	13	12	11	11	10	10	9.07	8.972	7.956	7.115	6.808	5.686	3.97	4.63	4.298	3.478	3.912	3.538
Percentage of CustomerAdvancesAndDeposits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:DebtInstrumentCarryingAmount

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
Value	1890	1839	1709	1602	1603	1829	1651	1483	1360	1347	1332	1327	1174	1201	1179	1042	986
Percentage of DebtInstrumentCarryingAmount	100.0	100.0	100.0	100.0	100.0	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:DebtInstrumentCollateralAmount

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	2015-12-31
Value	89	89	81	82	82	84	85	86	86	87	88	88	88	89	90	91	207	211	229	261	255	268
Percentage of DebtInstrumentCollateralAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

stag:A150MillionUnsecuredTermLoanA, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	3.38	3.38	3.38	0.0338	0.0338
Percentage of DebtInstrumentInterestRateEffectivePercentage	100.0	100.0	100.0	100.0	100.0

stag:A150MillionUnsecuredTermLoanB, us-gaap:LongTermDebt

Period End	2020-09-30	2020-06-30	2020-03-31
Value	3.05	0.0305	0.0305
Percentage of DebtInstrumentInterestRateEffectivePercentage	90.2	90.2	90.2

stag:A150MillionUnsecuredTermLoanC, us-gaap:LongTermDebt

Period End	2020-09-30	2020-06-30	2020-03-31
Value	2.39	0.0239	0.0239
Percentage of DebtInstrumentInterestRateEffectivePercentage	70.7	70.7	70.7

stag:A150MillionUnsecuredTermLoanD, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	2.85	2.85	2.85	0.0285	0.0285
Percentage of DebtInstrumentInterestRateEffectivePercentage	84.3	84.3	84.3	84.3	84.3

stag:A175MillionUnsecuredTermLoanE, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-09-30	2020-06-30	2020-03-31
Value	3.92	3.92	3.92	0.0392	0.0392
Percentage of DebtInstrumentInterestRateEffectivePercentage	116.0	116.0	116.0	116.0	116.0

stag:A300MillionUnsecuredTermLoanG, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	1.28	1.28	2.77	2.77	0.0331
Percentage of DebtInstrumentInterestRateEffectivePercentage	37.9	37.9	0.0	82.0	97.9

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsNonrecurring

Period End	2021-02-25
Value	4.1
Percentage of DebtInstrumentInterestRateEffectivePercentage	0.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet

Period End	2021-06-30	2021-03-31	2020-12-31
Value	134000.0	134000.0	-29000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumNet	100.0	100.0	100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet us-gaap:BusinessAcquisition, us-gaap:DebtInstrument

stag:RonkonkomaNY22521, stag:UnitedOfOmahaLifeInsuranceCompany

Period End	2021-02-25
Value	200000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumNet	0.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet us-gaap:LongtermDebtType

us-gaap:Mortgages

Period End	2021-06-30	2021-03-31	2020-12-31
Value	134000.0	134000.0	-29000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumNet	100.0	100.0	100.0

us-gaap:DebtInstrumentUnamortizedPremium

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	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	29000.0	31000.0	34000.0	37000.0	39000.0	42000.0	45000.0	48000.0	50000.0	52000.0	55000.0	58000.0	61000.0	112000.0	447000.0	308000.0	288000.0	394000.0
Percentage of DebtInstrumentUnamortizedPremium	100.0	100.0	100.0	100.0	100.0	100.0	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:DebtInstrumentUnamortizedPremium us-gaap:DebtInstrument

us-gaap:Mortgages

Period End	2020-12-31	2019-12-31	2018-12-31
Value	29000.0	39000.0	50000.0
Percentage of DebtInstrumentUnamortizedPremium	100.0	100.0	100.0

us-gaap:DebtInstrumentUnamortizedPremium us-gaap:LongtermDebtType

us-gaap:Mortgages

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	2015-09-30	2014-12-31
Value	29000.0	31000.0	34000.0	37000.0	39000.0	42000.0	45000.0	48000.0	50000.0	52000.0	55000.0	58000.0	61000.0	557000.0	308000.0
Percentage of DebtInstrumentUnamortizedPremium	100.0	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

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	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	463	514	390	497	451	540	553	568	574	502	301	323	349
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount	100.0	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:DeferredFinanceCostsGross us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsGross

stag:A300MillionUnsecuredTermLoanG

Period End	2021-02-05	2020-04-17
Value	1600000.0	2100000.0
Percentage of DeferredFinanceCostsGross	100.0	100.0

us-gaap:DeferredFinanceCostsGross us-gaap:LongtermDebtType

us-gaap:LineOfCredit

Period End	2021-02-05
Value	1200000.0
Percentage of DeferredFinanceCostsGross	75.0

us-gaap:DeferredFinanceCostsNet

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	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	5849000.0	6253000.0	5841000.0	6389000.0	6935000.0	5653000.0	6111000.0	6582000.0	5873000.0	6240000.0	6653000.0	7061000.0	6529000.0	5869000.0	6135000.0	6299000.0	6066000.0	6306000.0	8400000.0	10000000.0	9700000.0	8100000.0	8400000.0	7800000.0	6200000.0	6245000.0	6439000.0	5467000.0	5354000.0	5624000.0	5903000.0	4704000.0	3646000.0	2506000.0	2467000.0	2634000.0	2578000.0	2485000.0
Percentage of DeferredFinanceCostsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:DeferredFinanceCostsNet us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

us-gaap:PrepaidExpensesAndOtherCurrentAssets, us-gaap:LineOfCredit

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
Value	2200000.0	2500000.0	1600000.0	1800000.0	2000000.0	2200000.0	2400000.0	2600000.0	2800000.0	3000000.0	3200000.0	3400000.0	1200000.0	1300000.0	1500000.0
Percentage of DeferredFinanceCostsNet	37.6	40.0	27.4	28.2	28.8	38.9	39.3	39.5	47.7	48.1	48.1	48.2	18.4	22.2	24.4

us-gaap:DeferredFinanceCostsNet us-gaap:LongtermDebtType

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	2017-12-31
Value	4070000.0	4428000.0	3889000.0	4304000.0	4718000.0	3299000.0	3625000.0	3963000.0	3121000.0	3358000.0	3640000.0	3915000.0	3735000.0
Percentage of DeferredFinanceCostsNet	69.6	70.8	66.6	67.4	68.0	58.4	59.3	60.2	53.1	53.8	54.7	55.4	60.9

us-gaap:Mortgages

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
Value	169000.0	202000.0	233000.0	266000.0	299000.0	336000.0	369000.0	402000.0	436000.0	469000.0	500000.0	535000.0	567000.0	601000.0	634000.0
Percentage of DeferredFinanceCostsNet	2.9	3.2	4.0	4.2	4.3	5.9	6.0	6.1	7.4	7.5	7.5	7.6	8.7	10.2	10.3

us-gaap:UnsecuredDebt

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	2017-12-31	2013-10-07	2012-12-31	2012-09-30
Value	1610000.0	1623000.0	1719000.0	1819000.0	1918000.0	2018000.0	2117000.0	2217000.0	2316000.0	2413000.0	2512000.0	2611000.0	1766000.0	200000.0	900000.0	2200000.0
Percentage of DeferredFinanceCostsNet	27.5	26.0	29.4	28.5	27.7	35.7	34.6	33.7	39.4	38.7	37.8	37.0	28.8	0.0	19.1	60.3

us-gaap:DeferredRentReceivablesNet us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:DeferredRentReceivablesNet

us-gaap:AccruedIncomeReceivable

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
Value	68	65	60	54	51	48	44	40	37	34	32	30	28	25	24
Percentage of DeferredRentReceivablesNet	100.0	100.0	100.0	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:DerivativeAssetNotionalAmount us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeAssetNotionalAmount

us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	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	2014-12-31
Value	300	300	0.0	0.0	250	250	250	600	600	900	725	725	475	400	350	350	300	0.0	0.0	0.0	275	125
Percentage of DerivativeAssetNotionalAmount	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	0.0	0.0	0.0	100.0	100.0

us-gaap:DerivativeAssets

Period End	2021-06-30	2021-03-31	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	2014-12-31
Value	1.704	3.592	0.0	0.0	0.303	0.488	0.983	5.214	9.151	17	15	12	6.079	2.27	1.701	2.378	1.471	0.0	0.0	0.0	1.867	0.959
Percentage of DerivativeAssets	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	0.0	0.0	0.0	100.0	100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeAsset

stag:InterestRateDerivativeTheTorontoDominionBankApril182023

Period End	2021-06-30	2021-03-31
Value	428000.0	902000.0
Percentage of DerivativeFairValueOfDerivativeAsset	100.0	100.0

stag:InterestRateDerivativeUSBankNAApril182023

Period End	2021-06-30	2021-03-31
Value	848000.0	1794000.0
Percentage of DerivativeFairValueOfDerivativeAsset	198.1	198.9

stag:InterestRateDerivativeWellsFargoBankApril182023

Period End	2021-06-30	2021-03-31
Value	428000.0	896000.0
Percentage of DerivativeFairValueOfDerivativeAsset	100.0	99.3

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiability

stag:InterestRateDerivativeBankOfMontrealJuly152020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30
Value	-1990000.0	-2092000.0	-2978000.0	-3276000.0	-3436000.0	-3005000.0	-886000.0
Percentage of DerivativeFairValueOfDerivativeLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:InterestRateDerivativeBankofMontrealJuly262019

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	-3243000.0	-3582000.0	-4180000.0	-4568000.0	-4932000.0	-4892000.0	-2665000.0	-3232000.0	-2829000.0	-1696000.0	-1050000.0
Percentage of DerivativeFairValueOfDerivativeLiability	163.0	171.2	140.4	139.4	143.5	162.8	0.0	364.8	0.0	0.0	0.0

stag:InterestRateDerivativeCapitalOneFebruary142020

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	-912000.0	-1206000.0	-1508000.0	-1808000.0	-2121000.0	-2259000.0	-1061000.0	-1238000.0	-1072000.0	-487000.0	-171000.0
Percentage of DerivativeFairValueOfDerivativeLiability	45.8	57.6	50.6	55.2	61.7	75.2	0.0	139.7	0.0	0.0	0.0

stag:InterestRateDerivativePNCBank25mOctober302017

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	-637000.0	-739000.0	-865000.0	-978000.0	-1093000.0	-1077000.0	-229000.0	-362000.0	-209000.0
Percentage of DerivativeFairValueOfDerivativeLiability	32.0	35.3	29.0	29.9	31.8	35.8	0.0	40.9	0.0

stag:InterestRateDerivativePNCBank50mOctober302017

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	-1273000.0	-1477000.0	-1729000.0	-1956000.0	-2184000.0	-2154000.0	-456000.0	-723000.0	-417000.0
Percentage of DerivativeFairValueOfDerivativeLiability	64.0	70.6	58.1	59.7	63.6	71.7	0.0	81.6	0.0

stag:InterestRateDerivativePNCBankJuly262019

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	-3243000.0	-3582000.0	-4180000.0	-4568000.0	-4932000.0	-4892000.0	-2665000.0	-3232000.0	-2830000.0	-1699000.0	-1055000.0
Percentage of DerivativeFairValueOfDerivativeLiability	163.0	171.2	140.4	139.4	143.5	162.8	0.0	364.8	0.0	0.0	0.0

stag:InterestRateDerivativeRegionsBankFebruary142020

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	-891000.0	-1178000.0	-1473000.0	-1766000.0	-2072000.0	-2204000.0	-1003000.0	-1181000.0	-1015000.0	-430000.0	-115000.0
Percentage of DerivativeFairValueOfDerivativeLiability	44.8	56.3	49.5	53.9	60.3	73.3	0.0	133.3	0.0	0.0	0.0

stag:InterestRateDerivativeRegionsBankJuly152020

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	-2930000.0	-3096000.0	-4049000.0	-4411000.0	-4632000.0	-4195000.0	-1425000.0	-2032000.0	-1356000.0
Percentage of DerivativeFairValueOfDerivativeLiability	147.2	148.0	136.0	134.6	134.8	139.6	0.0	229.3	0.0

stag:InterestRateDerivativeRoyalBankofCanadaMarch202015

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-84000.0	-182000.0	-280000.0	-334000.0	-37000.0	-56000.0	-6000.0
Percentage of DerivativeFairValueOfDerivativeLiability	2.8	5.6	8.1	11.1	0.0	6.3	0.0

stag:InterestRateDerivativeRoyalBankofCanadaOctober302017

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	-638000.0	-740000.0	-866000.0	-980000.0	-1094000.0	-1079000.0	-230000.0	-364000.0	-211000.0
Percentage of DerivativeFairValueOfDerivativeLiability	32.1	35.4	29.1	29.9	31.8	35.9	0.0	41.1	0.0

stag:InterestRateDerivativeTDBank75mMarch192021

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	-64000.0	-83000.0	-199000.0	-230000.0	-251000.0
Percentage of DerivativeFairValueOfDerivativeLiability	3.2	4.0	6.7	7.0	7.3

stag:InterestRateDerivativeTDBank75mSep292020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	-64000.0	-83000.0	-220000.0	-272000.0	-290000.0
Percentage of DerivativeFairValueOfDerivativeLiability	3.2	4.0	7.4	8.3	8.4

stag:InterestRateDerivativeTheTorontoDominionBankFebruary142020

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	-441000.0	-584000.0	-730000.0	-874000.0	-1027000.0	-1091000.0	-490000.0	-579000.0	-496000.0	-204000.0	-46000.0
Percentage of DerivativeFairValueOfDerivativeLiability	22.2	27.9	24.5	26.7	29.9	36.3	0.0	65.3	0.0	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankJuly262019

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	-3243000.0	-3585000.0	-4179000.0	-4568000.0	-4932000.0	-4890000.0	-2663000.0	-3229000.0	-2828000.0	-1696000.0	-1050000.0
Percentage of DerivativeFairValueOfDerivativeLiability	163.0	171.4	140.3	139.4	143.5	162.7	0.0	364.4	0.0	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankMarch202015

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-84000.0	-182000.0	-280000.0	-334000.0	-38000.0	-57000.0	-7000.0
Percentage of DerivativeFairValueOfDerivativeLiability	2.8	5.6	8.1	11.1	0.0	6.4	0.0

stag:InterestRateDerivativeTheTorontoDominionBankOctober302017

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	-637000.0	-739000.0	-865000.0	-979000.0	-1093000.0	-1077000.0	-229000.0	-362000.0	-210000.0
Percentage of DerivativeFairValueOfDerivativeLiability	32.0	35.3	29.0	29.9	31.8	35.8	0.0	40.9	0.0

stag:InterestRateDerivativeTheTorontoDominionBankSeptember102017

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-446000.0	-970000.0	-1493000.0	-1840000.0	-778000.0	-982000.0	-907000.0
Percentage of DerivativeFairValueOfDerivativeLiability	15.0	29.6	43.5	61.2	0.0	110.8	0.0

stag:InterestRateDerivativeUSBankJuly152020

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	-2932000.0	-3100000.0	-4049000.0	-4411000.0	-4632000.0	-4194000.0	-1421000.0	-2029000.0	-1349000.0
Percentage of DerivativeFairValueOfDerivativeLiability	147.3	148.2	136.0	134.6	134.8	139.6	0.0	229.0	0.0

stag:InterestRateDerivativeUSBankJuly262019

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	-1622000.0	-1793000.0	-2090000.0	-2284000.0	-2466000.0	-2446000.0	-1332000.0	-1616000.0	-1415000.0	-848000.0	-524000.0
Percentage of DerivativeFairValueOfDerivativeLiability	81.5	85.7	70.2	69.7	71.8	81.4	0.0	182.4	0.0	0.0	0.0

stag:InterestRateDerivativeWellsFargoBank75mMarch192021

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	-71000.0	-91000.0	-206000.0	-239000.0	-258000.0
Percentage of DerivativeFairValueOfDerivativeLiability	3.6	4.3	6.9	7.3	7.5

stag:InterestRateDerivativeWellsFargoBank75mSep292020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	-70000.0	-90000.0	-227000.0	-279000.0	-298000.0
Percentage of DerivativeFairValueOfDerivativeLiability	3.5	4.3	7.6	8.5	8.7

stag:InterestRateDerivativeWellsFargoBankJuly152020

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	-2932000.0	-3100000.0	-4050000.0	-4412000.0	-4633000.0	-4195000.0	-1422000.0	-2030000.0	-1351000.0
Percentage of DerivativeFairValueOfDerivativeLiability	147.3	148.2	136.0	134.7	134.8	139.6	0.0	229.1	0.0

stag:InterestRateDerivativeWellsFargoBankMarch202015

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	-324000.0	-426000.0	-533000.0	-639000.0	-750000.0	-775000.0	-162000.0	-246000.0	-145000.0
Percentage of DerivativeFairValueOfDerivativeLiability	16.3	20.4	17.9	19.5	21.8	25.8	0.0	27.8	0.0

stag:InterestRateDerivativeWellsFargoBankOctober302017

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	-638000.0	-740000.0	-866000.0	-980000.0	-1094000.0	-1079000.0	-230000.0	-364000.0	-211000.0
Percentage of DerivativeFairValueOfDerivativeLiability	32.1	35.4	29.1	29.9	31.8	35.9	0.0	41.1	0.0

us-gaap:DerivativeFixedInterestRate us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DerivativeFixedInterestRate

stag:A150MillionUnsecuredTermLoanA, 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
Value	2.38	2.38	2.38	2.38	0.0238	0.0238	0.017	0.017	0.017	0.017
Percentage of DerivativeFixedInterestRate	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

stag:A150MillionUnsecuredTermLoanD, 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
Value	1.85	1.85	1.85	1.85	0.0185	0.0185	0.0185	0.0185	0.0185	0.0185
Percentage of DerivativeFixedInterestRate	77.7	77.7	77.7	77.7	77.7	77.7	108.8	108.8	108.8	108.8

stag:A175MillionUnsecuredTermLoanE, 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
Value	2.92	2.92	2.92	2.92	0.0292	0.0292	0.0292	0.0292	0.0292	0.0292
Percentage of DerivativeFixedInterestRate	122.7	122.7	122.7	122.7	122.7	122.7	171.8	171.8	171.8	171.8

stag:A200MillionUnsecuredTermLoanF, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	2.11	2.11	2.11	2.11	0.0211	0.0211	0.0211
Percentage of DerivativeFixedInterestRate	88.7	88.7	88.7	88.7	88.7	124.1	124.1

stag:A300MillionUnsecuredTermLoanG, us-gaap:LongTermDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	0.28	0.28	1.17	1.17	0.0172
Percentage of DerivativeFixedInterestRate	11.8	11.8	49.2	49.2	72.3

us-gaap:DerivativeFixedInterestRate us-gaap:DerivativeInstrumentRisk

stag:InterestRateDerivativeBankOfMontrealJuly152020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30
Value	1.7165	1.7165	1.7165	1.7165	0.017165	0.017165	0.017165
Percentage of DerivativeFixedInterestRate	72.1	72.1	72.1	72.1	72.1	72.1	101.0

stag:InterestRateDerivativeBankofMontrealJuly262019

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	2.919	2.919	2.919	2.919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919
Percentage of DerivativeFixedInterestRate	122.6	122.6	122.6	122.6	122.6	122.6	171.7	171.7	171.7	171.7	0.0	0.0

stag:InterestRateDerivativeCapitalOneFebruary142020

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	2.53	2.53	2.53	2.53	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253	0.0253
Percentage of DerivativeFixedInterestRate	106.3	106.3	106.3	106.3	106.3	106.3	148.8	148.8	148.8	148.8	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativePNCBank25mOctober302017

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	1.8485	1.8485	1.8485	1.8485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485
Percentage of DerivativeFixedInterestRate	77.7	77.7	77.7	77.7	77.7	77.7	108.7	108.7	108.7	108.7	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativePNCBank50mOctober302017

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	1.8475	1.8475	1.8475	1.8475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475	0.018475
Percentage of DerivativeFixedInterestRate	77.6	77.6	77.6	77.6	77.6	77.6	108.7	108.7	108.7	108.7	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativePNCBankJuly262019

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	2.919	2.919	2.919	2.919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919
Percentage of DerivativeFixedInterestRate	122.6	122.6	122.6	122.6	122.6	122.6	171.7	171.7	171.7	171.7	0.0	0.0

stag:InterestRateDerivativeRegionsBankFebruary142020

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	2.475	2.475	2.475	2.475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475	0.02475
Percentage of DerivativeFixedInterestRate	104.0	104.0	104.0	104.0	104.0	104.0	145.6	145.6	145.6	145.6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeRegionsBankJuly152020

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	2.2459	2.2459	2.2459	2.2459	0.022459	0.022459	0.022459	0.022459	0.022459
Percentage of DerivativeFixedInterestRate	94.4	94.4	94.4	94.4	94.4	94.4	132.1	132.1	132.1

stag:InterestRateDerivativeRoyalBankofCanadaMarch202015

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
Value	1.709	1.709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709	0.01709
Percentage of DerivativeFixedInterestRate	71.8	71.8	71.8	71.8	100.5	100.5	100.5	100.5	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeRoyalBankofCanadaOctober302017

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	1.8505	1.8505	1.8505	1.8505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505
Percentage of DerivativeFixedInterestRate	77.8	77.8	77.8	77.8	77.8	77.8	108.9	108.9	108.9	108.9	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeTDBank75mMarch192021

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	0.275	0.275	0.275	0.275	0.00275
Percentage of DerivativeFixedInterestRate	11.6	11.6	11.6	11.6	11.6

stag:InterestRateDerivativeTDBank75mSep292020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	0.275	0.275	0.275	0.275	0.00275
Percentage of DerivativeFixedInterestRate	11.6	11.6	11.6	11.6	11.6

stag:InterestRateDerivativeTheTorontoDominionBankFebruary142020

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	2.4535	2.4535	2.4535	2.4535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535	0.024535
Percentage of DerivativeFixedInterestRate	103.1	103.1	103.1	103.1	103.1	103.1	144.3	144.3	144.3	144.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankJuly262019

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	2.918	2.918	2.918	2.918	0.02918	0.02918	0.02918	0.02918	0.02918	0.02918	0.02918	0.02918
Percentage of DerivativeFixedInterestRate	122.6	122.6	122.6	122.6	122.6	122.6	171.6	171.6	171.6	171.6	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankMarch202015

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
Value	1.7105	1.7105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105	0.017105
Percentage of DerivativeFixedInterestRate	71.9	71.9	71.9	71.9	100.6	100.6	100.6	100.6	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankOctober302017

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	1.8485	1.8485	1.8485	1.8485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485	0.018485
Percentage of DerivativeFixedInterestRate	77.7	77.7	77.7	77.7	77.7	77.7	108.7	108.7	108.7	108.7	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeTheTorontoDominionBankSeptember102017

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
Value	2.2255	2.2255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255	0.022255
Percentage of DerivativeFixedInterestRate	93.5	93.5	93.5	93.5	130.9	130.9	130.9	130.9	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeUSBankJuly152020

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	2.2459	2.2459	2.2459	2.2459	0.022459	0.022459	0.022459	0.022459	0.022459
Percentage of DerivativeFixedInterestRate	94.4	94.4	94.4	94.4	94.4	94.4	132.1	132.1	132.1

stag:InterestRateDerivativeUSBankJuly262019

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	2.919	2.919	2.919	2.919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919	0.02919
Percentage of DerivativeFixedInterestRate	122.6	122.6	122.6	122.6	122.6	122.6	171.7	171.7	171.7	171.7	0.0	0.0

stag:InterestRateDerivativeWellsFargoBank75mMarch192021

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	0.28	0.28	0.28	0.28	0.0028
Percentage of DerivativeFixedInterestRate	11.8	11.8	11.8	11.8	11.8

stag:InterestRateDerivativeWellsFargoBank75mSep292020

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30
Value	0.279	0.279	0.279	0.279	0.00279
Percentage of DerivativeFixedInterestRate	11.7	11.7	11.7	11.7	11.7

stag:InterestRateDerivativeWellsFargoBankJuly152020

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	2.246	2.246	2.246	2.246	0.02246	0.02246	0.02246	0.02246	0.02246
Percentage of DerivativeFixedInterestRate	94.4	94.4	94.4	94.4	94.4	94.4	132.1	132.1	132.1

stag:InterestRateDerivativeWellsFargoBankMarch202015

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	1.828	1.828	1.828	1.828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828	0.01828
Percentage of DerivativeFixedInterestRate	76.8	76.8	76.8	76.8	76.8	76.8	107.5	107.5	107.5	107.5	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

stag:InterestRateDerivativeWellsFargoBankOctober302017

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	1.8505	1.8505	1.8505	1.8505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505	0.018505
Percentage of DerivativeFixedInterestRate	77.8	77.8	77.8	77.8	77.8	77.8	108.9	108.9	108.9	108.9	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DerivativeFixedInterestRate us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:ScenarioForecast, stag:A200MillionUnsecuredTermLoanF, us-gaap:LongTermDebt

Period End	2020-07-15
Value	0.0211
Percentage of DerivativeFixedInterestRate	0.0

srt:ScenarioForecast, stag:A300MillionUnsecuredTermLoanG, us-gaap:LongTermDebt

Period End	2023-04-18	2021-03-19	2020-09-29
Value	0.94	0.0028	0.0117
Percentage of DerivativeFixedInterestRate	0.0	0.0	0.0

us-gaap:DerivativeLiabilities

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	2014-12-31
Value	28	32	40	45	50	48	18	24	18	7.06	4.011	0.0	0.0	0.0	1.217	2.873	2.955	1.985	2.438	15	18	13	3.766	0.873
Percentage of DerivativeLiabilities	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DerivativeLiabilityNotionalAmount us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeLiabilityNotionalAmount

us-gaap:InterestRateSwap

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	2014-12-31
Value	975	975	1125	1125	1275	975	850	850	800	300	300	0.0	0.0	0.0	250	325	325	325	375	675	675	675	400	100
Percentage of DerivativeLiabilityNotionalAmount	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DividendsPayableCurrentAndNoncurrent

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	19	19	19	18	18	18	17	16	16	15	13	14	15	14	11	11	11	10	9.728	8.814	8.327	8.527	8.234	8.228	8.032	7.696	7.355	6.565	6.003	5.818	5.166	15	17	16	11	12	10	7.793	6.16	6.159
Percentage of DividendsPayableCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

stag:LongTermIncentivePlanUnits

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	4.1	6.5	4.6	5.6	6.5	7.5	4.5	5.5	6.4	7.3	4.8	5.7	6.6	7.5
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	100.0	100.0	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:PerformanceShares

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	8.5	10.0	5.9	7.3	8.6	10.0	5.9	7.0	8.1	9.2	5.3	6.1	7.0	7.8
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	207.3	153.8	128.3	130.4	132.3	133.3	131.1	127.3	126.6	126.0	110.4	107.0	106.1	104.0

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
Value	4.4	5.0	3.2	3.7	4.2	4.7	2.9	3.4	3.9	4.4	2.7	3.1	3.7	4.1
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	107.3	76.9	69.6	66.1	64.6	62.7	64.4	61.8	60.9	60.3	56.2	54.4	56.1	54.7

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

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	260	264	258	264	267	256	241	241	229	224	246	237	220	215	280	273	257	251	237	238	225	209	200	189	176	159	146	133	95
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AboveMarketLeases

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	2014-12-31
Value	31	35	33	36	36	34	32	33	31	30	31	31	29	30	36	36	34	34	32	35	35	32	31	25
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	12.0	13.3	13.0	13.9	13.6	13.4	13.3	13.9	13.8	13.5	12.6	13.3	13.6	14.3	13.1	13.3	13.2	13.8	13.8	15.0	15.6	15.7	15.7	17.4

us-gaap:OtherIntangibleAssets

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	2014-12-31
Value	229	228	224	227	231	222	209	207	198	194	215	206	190	184	243	237	223	216	204	202	190	177	169	120
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	88.0	86.7	87.0	86.1	86.4	86.6	86.7	86.1	86.2	86.5	87.4	86.7	86.4	85.7	86.9	86.7	86.8	86.2	86.2	85.0	84.4	84.3	84.3	82.6

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:MajorPropertyClass

us-gaap:FiniteLivedIntangibleAssets

Period End	2020-12-31	2019-12-31	2019-06-30	2019-03-31	2018-12-31
Value	258	241	229	224	246
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

stag:AboveAndBelowMarketLeases

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2018-12-31
Value	0.327	0.483	1.422	4.321	3.853
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2018-12-31
Value	68	67	75	74	61
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	21075.5	13933.7	5320.8	1714.0	1589.7

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

stag:AboveAndBelowMarketLeases

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	0.283	0.517	0.859	1.827	2.894	1.283	2.305	2.9	0.927	1.974	2.987
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherIntangibleAssets

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	38	56	18	36	56	18	33	48	17	33	48
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	13739.9	11011.0	2129.2	2024.2	1964.4	1457.4	1454.8	1664.8	1862.2	1710.4	1633.9

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

stag:AboveAndBelowMarketLeases

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	1.757	2.812	2.703	2.687	2.869	2.608	2.171	1.363	1.413	1.154	1.185	1.21
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	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:OtherIntangibleAssets

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	40	38	38	38	36	37	32	28	26	29	26	23
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2316.3	1385.0	1406.5	1414.6	1261.1	1437.6	1474.0	2108.0	1865.0	2572.8	2233.2	1910.2

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

stag:AboveAndBelowMarketLeases

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	1.164	1.283	1.988	2.504	2.395	2.379	2.494	2.657	2.176	1.361	1.368	2.163	2.195	2.178
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	100.0	100.0	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:OtherIntangibleAssets

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	43	42	48	47	46	46	44	45	38	35	32	37	33	30
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3732.4	3280.2	2417.1	1907.3	1959.5	1975.5	1798.6	1702.4	1776.4	2572.9	2374.7	1721.2	1529.5	1388.5

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

stag:AboveAndBelowMarketLeases

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	1.286	1.452	1.52	2.298	2.19	2.202	2.421	3.559	2.986	2.221	2.194	3.546	3.599	3.504
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	100.0	100.0	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:OtherIntangibleAssets

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	51	49	57	56	55	55	53	54	47	43	40	47	44	40
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3981.6	3420.5	3761.4	2448.0	2532.4	2523.1	2191.2	1524.7	1574.4	1952.7	1840.5	1346.6	1230.3	1168.8

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

stag:AboveAndBelowMarketLeases

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	0.82	0.983	1.068	2.764	2.717	2.77	3.202	4.87	4.292	3.546	3.519	3.926	3.98	3.846
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	100.0	100.0	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:OtherIntangibleAssets

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	60	58	65	65	65	65	62	66	57	54	51	57	54	50
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7355.2	5974.1	6161.5	2373.9	2396.6	2355.0	1946.0	1357.1	1349.3	1530.3	1456.1	1473.3	1366.1	1323.6

us-gaap:FiniteLivedIntangibleAssetsGross

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	2014-12-31
Value	743	754	757	703	719	730	716	655	610	573	588	565	536	520	593	592	580	540	531	515	481	473	477	393
Percentage of FiniteLivedIntangibleAssetsGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AboveMarketLeases

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	2014-12-31
Value	86	92	92	93	92	93	92	88	83	70	73	70	69	70	78	79	78	71	70	70	68	68	69	63
Percentage of FiniteLivedIntangibleAssetsGross	11.6	12.2	12.2	13.2	12.9	12.8	12.9	13.5	13.6	12.4	12.4	12.5	13.0	13.6	13.2	13.4	13.5	13.3	13.3	13.7	14.3	14.5	14.6	16.2

us-gaap:OtherIntangibleAssets

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	2014-12-31
Value	657	662	665	610	626	636	623	566	527	502	515	495	467	450	515	512	501	468	461	444	413	404	407	330
Percentage of FiniteLivedIntangibleAssetsGross	88.4	87.8	87.8	86.8	87.1	87.2	87.1	86.5	86.4	87.6	87.6	87.5	87.0	86.4	86.8	86.6	86.5	86.7	86.7	86.3	85.7	85.5	85.4	83.8

us-gaap:ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue

us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-04-05
Value	50
Percentage of ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue	100.0

us-gaap:InterestPayableCurrent us-gaap:BalanceSheetLocation

us-gaap:InterestPayableCurrent

us-gaap:AccountsPayableAndAccruedLiabilities

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	6300000.0	7900000.0	6300000.0	7800000.0	6100000.0	7700000.0	6300000.0	7600000.0	7700000.0	7700000.0	5900000.0	7700000.0	7800000.0	5600000.0
Percentage of InterestPayableCurrent	100.0	100.0	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:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet

us-gaap:InterestRateSwap

Period End	2020-12-31
Value	16
Percentage of InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	100.0

us-gaap:InterestRateDerivativeAssetsAtFairValue us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateDerivativeAssetsAtFairValue

us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	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	2014-12-31
Value	1.704	3.592	0.0	0.0	0.303	0.488	0.983	5.214	9.151	17	15	12	6.079	2.27	1.701	2.378	1.471	0.0	0.0	0.0	1.867	0.959
Percentage of InterestRateDerivativeAssetsAtFairValue	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	0.0	0.0	0.0	100.0	100.0

us-gaap:InterestRateDerivativeAssetsAtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	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	2014-12-31
Value	1.704	3.592	0.0	0.0	0.303	0.488	0.983	5.214	9.151	17	15	12	6.079	2.27	1.701	2.378	1.471	0.0	0.0	0.0	1.867	0.959
Percentage of InterestRateDerivativeAssetsAtFairValue	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	0.0	0.0	0.0	100.0	100.0

us-gaap:InterestRateDerivativeAssetsAtFairValue us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap

Period End	2021-06-30	2021-03-31	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	2014-12-31
Value	1.704	3.592	0.0	0.0	0.303	0.488	0.983	5.214	9.151	17	15	12	6.079	2.27	1.701	2.378	1.471	0.0	0.0	0.0	1.867	0.959
Percentage of InterestRateDerivativeAssetsAtFairValue	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	0.0	0.0	0.0	100.0	100.0

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue

us-gaap:InterestRateSwap

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	2014-12-31
Value	28	32	40	45	50	48	18	24	18	7.06	4.011	0.0	0.0	0.0	1.217	2.873	2.955	1.985	2.438	15	18	13	3.766	0.873
Percentage of InterestRateDerivativeLiabilitiesAtFairValue	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap

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	2014-12-31
Value	28	32	40	45	50	48	18	24	18	7.06	4.011	0.0	0.0	0.0	1.217	2.873	2.955	1.985	2.438	15	18	13	3.766	0.873
Percentage of InterestRateDerivativeLiabilitiesAtFairValue	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InterestRateDerivativeLiabilitiesAtFairValue us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:InterestRateSwap

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	2014-12-31
Value	28	32	40	45	50	48	18	24	18	7.06	4.011	0.0	0.0	0.0	1.217	2.873	2.955	1.985	2.438	15	18	13	3.766	0.873
Percentage of InterestRateDerivativeLiabilitiesAtFairValue	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InvestmentBuildingAndBuildingImprovements

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	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2013-12-31
Value	3630	3565	3532	3164	3141	3155	3087	2788	2574	2392	2285	2202	2073	1958	1932	1880	1800	1607	1550	1440	1339	1332	1272	1213	1171	1224	1141	944
Percentage of InvestmentBuildingAndBuildingImprovements	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

Period End	2021-06-30	2021-03-31	2020-12-31
Value	3188000.0	3188000.0	2309000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	100.0	100.0	100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

Period End	2021-06-30	2021-03-31	2020-09-30
Value	1357000.0	1681000.0	606000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

Period End	2020-12-31	2020-09-30
Value	231	240
Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	251	240	277	284
Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears	100.0	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

Period End	2021-06-30	2021-03-31	2020-12-31
Value	396	382	399
Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear

Period End	2021-06-30	2021-03-31	2020-09-30
Value	208	306	92
Percentage of LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	942	906	836	911
Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter	100.0	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	304	289	325	327
Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears	100.0	100.0	100.0	100.0

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	355	339	369	362
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears	100.0	100.0	100.0	100.0

us-gaap:LettersOfCreditOutstandingAmount

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	2900000.0	2600000.0	3000000.0	3000000.0
Percentage of LettersOfCreditOutstandingAmount	100.0	100.0	100.0	100.0

us-gaap:LineOfCredit

Period End	2021-06-30	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	2014-12-31
Value	284	233	107	0.0	225	146	78	129	115	100	95	17	218	271	245	130	71	28	129	64	6.0	56	131
Percentage of LineOfCredit	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

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LineOfCredit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2018-09-30	2018-07-26	2018-06-30	2012-09-30	2011-04-20
Value	750	750	500	500	500	500	500	500	450	150	100
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, us-gaap:SubsequentEvent

Period End	2021-02-05	2018-07-26
Value	750	500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity	0.0	100.0

us-gaap:LoansPayable

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	2014-12-31
Value	970	970	971	970	970	971	871	771	596	596	596	596	521	521	446	446	446	446	446	297	296	299	300	150
Percentage of LoansPayable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:LongTermDebtFairValue

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
Value	1949	1895	1768	1649	1636	1812	1691	1528	1397	1369	1343	1329	1181	1213	1198
Percentage of LongTermDebtFairValue	100.0	100.0	100.0	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:LongTermDebtFairValue us-gaap:DebtInstrument

us-gaap:LineOfCredit

Period End	2020-12-31	2019-12-31	2018-12-31
Value	107	146	100
Percentage of LongTermDebtFairValue	6.1	8.6	7.5

us-gaap:LongTermDebt

Period End	2020-12-31	2019-12-31	2018-12-31
Value	978	875	600
Percentage of LongTermDebtFairValue	55.3	51.7	44.7

us-gaap:Mortgages

Period End	2020-12-31	2019-12-31	2018-12-31
Value	54	56	57
Percentage of LongTermDebtFairValue	3.1	3.3	4.3

us-gaap:UnsecuredDebt

Period End	2020-12-31	2019-12-31	2018-12-31
Value	628	614	585
Percentage of LongTermDebtFairValue	35.5	36.3	43.6

us-gaap:LongTermDebtFairValue us-gaap:LongtermDebtType

us-gaap:LineOfCredit

Period End	2021-06-30	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
Value	284	233	107	0.0	221	146	78	129	115	100	95	17	218	271
Percentage of LongTermDebtFairValue	14.6	12.3	6.1	0.0	12.2	8.6	5.1	9.2	8.4	7.5	7.1	1.4	18.0	22.7

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
Value	979	975	978	965	964	962	875	775	600	600	600	607	526	526	451
Percentage of LongTermDebtFairValue	50.2	51.4	55.3	58.5	58.9	53.1	51.7	50.7	42.9	43.8	44.7	45.7	44.6	43.4	37.7

us-gaap:Mortgages

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
Value	58	58	54	55	55	53	56	56	57	57	57	57	57	58	59
Percentage of LongTermDebtFairValue	3.0	3.1	3.1	3.3	3.4	3.0	3.3	3.7	4.1	4.2	4.3	4.3	4.9	4.8	5.0

us-gaap:UnsecuredDebt

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	2012-12-31	2012-09-30
Value	627	628	628	628	617	574	614	618	611	596	585	569	580	410	415	150	100
Percentage of LongTermDebtFairValue	32.2	33.2	35.5	38.1	37.7	31.7	36.3	40.5	43.7	43.6	43.6	42.8	49.1	33.8	34.7	0.0	0.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

Period End	2020-12-31
Value	250
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

Period End	2020-12-31
Value	2064000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

Period End	2020-12-31
Value	375
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

Period End	2020-12-31
Value	225
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

Period End	2020-12-31
Value	660
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

Period End	2020-12-31
Value	196
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	100.0

us-gaap:LongtermDebtWeightedAverageInterestRate

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	2.99	3.05	3.46	3.62
Percentage of LongtermDebtWeightedAverageInterestRate	100.0	100.0	100.0	100.0

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners us-gaap:Ownership

us-gaap:MinorityInterestOwnershipPercentageByNoncontrollingOwners

stag:LimitedPartnerNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31	2017-12-31
Value	2.2	2.2	2.0	2.2	0.023	0.025	0.025	0.035	4.1
Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:NotesPayable

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	2014-12-31
Value	573	573	573	573	573	572	572	572	572	572	572	572	572	398	398	398	398	398	397	397	397	399	400	180
Percentage of NotesPayable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:OperatingLeaseWeightedAverageDiscountRatePercent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	6.8	6.8	6.8	6.8	0.068	0.068	0.071
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PreferredStockLiquidationPreference us-gaap:StatementClassOfStock

us-gaap:PreferredStockLiquidationPreference

us-gaap:SeriesCPreferredStock

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
Value	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	25.0	0
Percentage of PreferredStockLiquidationPreference	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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

us-gaap:PreferredStockValue

Period End	2020-12-31	2019-12-31	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31
Value	75	75	69	69	69	69	69	69
Percentage of PreferredStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PreferredStockValue us-gaap:StatementClassOfStock

us-gaap:SeriesCPreferredStock

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	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	75	75	75	75	75	75	75	75	75	75	75	75	75	75	75	75	75	75	75	0.0
Percentage of PreferredStockValue	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	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:PrepaidExpenseAndOtherAssets

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	51	44	43	49	39	37	38	46	36	42	36	35	28	29	25	27	24	26	20	24	20	26	24	26	24	26	22	21	4.687	4.987	2.594	3.59	3.268	3.657	1.556	5.706	1.954	1.49	1.355	1.817	1.954
Percentage of PrepaidExpenseAndOtherAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation us-gaap:MajorPropertyClass

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation

us-gaap:Building

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	2014-12-31
Value	366	347	327	311	292	272	254	240	227	211	199	190	178	171	160	152	143	134	125	124	116	110	104	75
Percentage of PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:LandBuildingsAndImprovements

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	161	152	143	138	130	120	111	105	96	88	80	75	68	56
Percentage of PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	44.0	43.8	43.9	44.5	44.5	44.2	43.9	43.6	42.4	41.7	40.6	39.8	38.3	35.0

us-gaap:LeaseholdImprovements

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	2014-12-31
Value	25	25	24	23	23	23	21	20	20	21	36	35	33	33	32	32	30	29	28	29	28	27	26	20
Percentage of PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	6.8	7.3	7.6	7.6	8.1	8.5	8.4	8.7	9.1	9.9	18.3	18.6	18.9	19.7	20.4	21.0	21.0	22.2	22.5	23.6	24.6	24.6	25.2	27.9

us-gaap:PropertySubjectToOrAvailableForOperatingLeaseNet

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	2014-12-31
Value	4623	4556	4525	4050	4038	4072	3998	3622	3353	3118	2991	2886	2732	2588	2567	2520	2433	2178	2116	1972	1830	1821	1837	1558
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:PropertySubjectToOrAvailableForOperatingLeaseNet us-gaap:MajorPropertyClass

us-gaap:Building

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	2014-12-31
Value	3306	3242	3195	2862	2833	2844	2787	2520	2330	2180	2082	2006	1886	1784	1756	1695	1636	1468	1408	1318	1234	1227	1232	1042
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	71.5	71.1	70.6	70.7	70.2	69.8	69.7	69.6	69.5	69.9	69.6	69.5	69.1	69.0	68.4	67.3	67.3	67.4	66.5	66.8	67.4	67.4	67.1	66.9

us-gaap:ConstructionInProgress

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	4.765	6.759	18	19	30	26	29	23	19	7.088	3.949	5.669	4.863	1.951	2.877	19	8.587	2.892	9.298	8.457	8.51	4.932	1.658
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	0.1	0.1	0.4	0.5	0.8	0.7	0.7	0.7	0.6	0.2	0.1	0.2	0.2	0.1	0.1	0.8	0.4	0.1	0.4	0.4	0.5	0.3	0.1

us-gaap:FiniteLivedIntangibleAssets

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	482	490	499	439	451	473	475	413	381	348	342
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	10.4	10.8	11.0	10.8	11.2	11.6	11.9	11.4	11.4	11.2	11.4

us-gaap:Land

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	2014-12-31
Value	510	500	492	447	444	443	435	420	397	377	364	355	342	324	321	321	310	281	272	254	234	229	228	191
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	11.0	11.0	10.9	11.0	11.0	10.9	10.9	11.6	11.8	12.1	12.2	12.3	12.5	12.5	12.5	12.7	12.8	12.9	12.9	12.9	12.8	12.6	12.5	12.3

us-gaap:LandBuildingsAndImprovements

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	278	274	275	243	239	244	232	210	192	173	168	160	151	143
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	6.0	6.0	6.1	6.0	5.9	6.0	5.8	5.8	5.7	5.6	5.6	5.6	5.5	5.6

us-gaap:LeaseholdImprovements

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	2014-12-31
Value	41	42	43	39	38	40	38	33	32	31	30	30	30	29	30	30	27	24	24	22	20	21	23	22
Percentage of PropertySubjectToOrAvailableForOperatingLeaseNet	0.9	0.9	1.0	1.0	1.0	1.0	1.0	0.9	1.0	1.0	1.0	1.1	1.1	1.1	1.2	1.2	1.1	1.1	1.2	1.1	1.1	1.2	1.3	1.5

us-gaap:RealEstateAccumulatedDepreciation

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	495	393	316	251	187	150	105	71	46	30
Percentage of RealEstateAccumulatedDepreciation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements

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
Value	4028	3508	2602	2198	1737	1482	1224	944	711
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfLand

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
Value	492	451	364	325	272	228	191	134	104
Percentage of RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements

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
Value	3831	3350	2481	2099	1673	1439	1192	924	696
Percentage of RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfLand

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
Value	492	451	364	325	272	228	191	134	104
Percentage of RealEstateAndAccumulatedDepreciationInitialCostOfLand	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateGrossAtCarryingValue

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	4521	3959	2966	2524	2009	1711	1415	1079	816	502
Percentage of RealEstateGrossAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RealEstateHeldforsale

Period End	2021-06-30	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31
Value	2.737	0.444	0.0	1.157	43	0.0	0.0	1.509	13	19	0.0
Percentage of RealEstateHeldforsale	100.0	100.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	0.0

us-gaap:RealEstateHeldforsale us-gaap:DisposalGroupClassification, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, us-gaap:BuildingAndBuildingImprovements

Period End	2021-06-30	2020-12-31	2020-03-31	2019-12-31	2018-06-30	2018-03-31	2017-12-31
Value	1.9	0.4	1.0	27	1.4	10	13
Percentage of RealEstateHeldforsale	69.4	90.1	86.4	64.6	92.8	79.3	68.3

us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperations, us-gaap:Land

Period End	2021-06-30	2020-12-31	2020-03-31	2019-12-31	2018-06-30	2018-03-31	2017-12-31
Value	0.8	0.044	0.2	15	0.1	2.0	4.2
Percentage of RealEstateHeldforsale	29.2	9.9	17.3	35.3	6.6	14.8	21.1

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation

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	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	552	524	495	473	446	416	387	367	344	321	316	301	280	266	249	234	217	202	187	183	150	140	129	117	105	96	88	79	71	64	58	52	46	41	37	33	30	26	23
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:RealEstateInvestmentPropertyNet

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	4623	4556	4525	4050	4038	4072	3998	3622	3353	3118	2991	2886	2732	2588	2567	2520	2433	2178	2116	1972	1830	1821	1837	1756	1684	1628	1310	1214	1087	1030	1007	942	885	811	770	613	548	498	472	444	402
Percentage of RealEstateInvestmentPropertyNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:RealEstateInvestmentPropertyNet us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations

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	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2015-12-31	2014-12-31
Value	27	17	137	64	54	52	34	20	16	15	135	40	24	8.6	3.6	90	28	27	17	10
Percentage of RealEstateInvestmentPropertyNet	0.6	0.4	3.0	1.6	1.3	1.3	0.9	0.6	0.5	0.5	4.5	1.6	1.0	0.4	0.2	4.3	1.5	1.5	0.9	0.8

us-gaap:RestrictedCashAndCashEquivalents

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	3.927	3.738	4.673	4.623	12	16	2.823	2.733	4.503	4.451	14	5.231	6.124	7.259	3.567	3.547	8.783	8.72	9.613	9.325	14	8.403	8.395	8.54	7.959	7.233	6.906	6.668	6.525	6.813	6.806	6.81	9.274	7.54	5.497	5.768	10	8.219	6.611	7.311	5.637
Percentage of RestrictedCashAndCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:SaleOfStockPricePerShare us-gaap:Range, us-gaap:StatementClassOfStock, us-gaap:SubsidiarySaleOfStock

us-gaap:SaleOfStockPricePerShare

srt:WeightedAverage, us-gaap:CommonStock, stag:AtTheMarketProgram2019600Million

Period End	2021-06-30	2021-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	34.01	32.35	29.01	28.32	28.02	27.6
Percentage of SaleOfStockPricePerShare	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SaleOfStockPricePerShare us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, us-gaap:SubsequentEvent, stag:AtTheMarketProgram2019600Million

Period End	2021-07-27	2021-05-04	2021-04-05
Value	37.67	33.9	34.214
Percentage of SaleOfStockPricePerShare	0.0	0.0	0.0

us-gaap:SecuredDebt

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	55	56	51	52	52	54	54	55	55	56	56	56	57	57	58	58	146	151	163	200	197	214	231	232	227	224	225	222	223	224	225	226	227	228	229	161	287	297	296	291	255
Percentage of SecuredDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:SecurityDepositLiability

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	11	11	11	10	10.0	9.9	9.8	9.2	9.0	8.7	8.4	8.7	8.7	8.1
Percentage of SecurityDepositLiability	100.0	100.0	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:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:RestrictedStock

Period End	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	2017-03-31	2016-12-31	2016-03-31	2015-12-31
Value	184890.0	189600.0	189910.0	193040.0	220270.0	220370.0	220540.0	190460.0	190830.0	195210.0	196370.0	237210.0	239830.0	272340.0	285460.0	271120.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	100.0	100.0	100.0	100.0	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:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

stag:LongTermIncentivePlanUnits

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-01-01
Value	27.74	27.38	26.54	27.06	26.92	26.51	23.37	22.52
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

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	2019-01-01
Value	28.96	28.96	27.7	27.77	27.77	27.77	24.38	23.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	104.4	105.8	104.4	102.6	103.2	104.8	104.3	102.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized

stag:EquityIncentivePlan2011

Period End	2020-12-31
Value	6642500.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

stag:EquityIncentivePlan2011

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	2011-04-03	2011-04-01
Value	2325400.0	2851300.0	3276100.0	983740.0	1156600.0	1449400.0	1867700.0	2778800.0	1175400.0	1473900.0	1755200.0	1755200.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	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:SharesIssuedPricePerShare

Period End	2020-11-16	2020-01-13	2019-09-24	2019-04-01
Value	30.02	30.902	28.6	28.72
Percentage of SharesIssuedPricePerShare	100.0	100.0	100.0	100.0

us-gaap:SharesIssuedPricePerShare us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStock, us-gaap:SubsequentEvent, stag:AtTheMarketProgram2019600Million

Period End	2021-07-27	2021-05-04	2021-04-05
Value	37.98	34.24	34.56
Percentage of SharesIssuedPricePerShare	0.0	0.0	0.0

us-gaap:SharesIssuedPricePerShare us-gaap:SubsidiarySaleOfStock

us-gaap:OverAllotmentOption

Period End	2020-12-15
Value	29.9
Percentage of SharesIssuedPricePerShare	0.0

Line plots across dimensions of each concept

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType, us-gaap:IncomeStatementLocation
(None, 'us-gaap:GeneralAndAdministrativeExpense')

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)

us-gaap:LongTermDebt
us-gaap:LongtermDebtType
(None,)

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
(None,)

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents
(None,)

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents
(None,)

STAG

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue

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

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AwardType

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:RestrictedStock

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType, us-gaap:IncomeStatementLocation

us-gaap:AllocatedShareBasedCompensationExpense

stag:LongTermIncentivePlanUnits, us-gaap:GeneralAndAdministrativeExpense

us-gaap:PerformanceShares, us-gaap:GeneralAndAdministrativeExpense

us-gaap:RestrictedStock, us-gaap:GeneralAndAdministrativeExpense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:TitleOfIndividual, us-gaap:IncomeStatementLocation

srt:Director, us-gaap:GeneralAndAdministrativeExpense

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

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

Disposal Group Not Discontinued Operation Gain Loss On Disposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

us-gaap:InterestExpense us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateSwap

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

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

us-gaap:NonoperatingIncomeExpense

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

us-gaap:NoncontrollingInterest

us-gaap:Parent

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact