Segment Information - Schedule of Financial Information of Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Revenues	$ 3,256,902	$ 2,560,244	$ 1,924,170
Operating expenses
Total self-storage operations expenses	1,855,873	1,390,103	888,017
Net operating income
Net operating income	1,323,360	1,170,141	1,050,402
Other components of net income:
Management fees and other income	120,855	101,986	83,904
Transaction costs	0	0	(1,548)
Life Storage Merger transition costs	0	(66,732)	0
General and administrative expense	(167,398)	(146,408)	(129,251)
Depreciation and amortization expense	(783,023)	(506,053)	(288,316)
Gain (loss) on real estate assets held for sale and sold, net	(25,906)	0	14,249
Impairment of Life Storage trade name	(51,763)	0	0
Interest expense	(551,354)	(419,035)	(219,171)
Non-cash interest expense related to amortization of discount on Life Storage unsecured senior notes	(43,720)	(18,786)	0
Interest income	124,422	84,857	69,422
Equity in earnings and dividend income from unconsolidated real estate entities	67,272	54,835	41,428
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and sale of a joint venture interest	13,730	0	0
Income tax expense	(33,478)	(21,559)	(20,925)
Net income (loss)	900,232	850,453	921,156
Operating Segments
Revenues:
Revenues	3,136,047	2,458,258	1,840,266
Operating expenses
Total segment operating expenses	905,452	670,910	468,902
Net operating income
Net operating income	2,230,595	1,787,348	1,371,364
Operating Segments | Self-Storage Operations
Revenues:
Revenues	2,803,252	2,222,578	1,654,735
Operating expenses
Payroll and benefits	170,529	127,300	94,005
Marketing	64,146	44,117	26,349
Office expense	123,604	97,621	74,400
Property operating expense	74,498	57,376	38,982
Repairs and maintenance	55,097	38,750	27,834
Property taxes	292,413	212,360	153,558
Insurance	32,892	25,466	14,636
Other segment items	18,387	9,046	5,578
Total segment operating expenses	831,566	612,036	435,342
Net operating income
Net operating income	1,971,686	1,610,542	1,219,393
Operating Segments | Tenant Reinsurance
Revenues:
Revenues	332,795	235,680	185,531
Operating expenses
Other segment items	73,886	58,874	33,560
Net operating income
Net operating income	$ 258,909	$ 176,806	$ 151,971