Segment Information - Schedule of Financial Information of Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 2,560,244	$ 1,924,170	$ 1,577,362
Operating expenses	1,390,103	888,017	742,169
Net operating income	1,170,141	1,050,402	975,953
Property management fees and other income	101,986	83,904	66,264
Transaction costs	0	(1,548)	0
Life Storage Merger transition costs	(66,732)	0	0
General and administrative expense	(146,408)	(129,251)	(102,194)
Depreciation and amortization expense	(506,053)	(288,316)	(241,879)
Gain on real estate transactions	0	14,249	140,760
Interest expense	(419,035)	(219,171)	(166,183)
Non-cash interest expense related to amortization of discount on Life Storage unsecured senior notes	(18,786)	0	0
Interest income	84,857	69,422	49,703
Equity in earnings and dividend income from unconsolidated real estate entities	54,835	41,428	32,358
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets	0	0	6,251
Income tax expense	(21,559)	(20,925)	(20,324)
Net income (loss)	850,453	921,156	877,758
Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,458,258	1,840,266	1,511,098
Operating expenses	670,910	468,902	398,096
Net operating income	1,787,348	1,371,364	1,113,002
Operating Segments | Self-Storage Operations
Segment Reporting Information [Line Items]
Revenues	2,222,578	1,654,735	1,340,990
Operating expenses	612,036	435,342	368,608
Net operating income	1,610,542	1,219,393	972,382
Operating Segments | Tenant Reinsurance
Segment Reporting Information [Line Items]
Revenues	235,680	185,531	170,108
Operating expenses	58,874	33,560	29,488
Net operating income	$ 176,806	$ 151,971	$ 140,620