Segment Information - Schedule of Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues:	$ 824,804	$ 748,034	$ 2,435,006	$ 1,762,470
Operating expenses:	461,341	448,242	1,376,295	925,797
Net operating income:	302,739	299,792	943,328	836,673
Management fees and other income	29,882	28,019	89,888	71,609
Life Storage Merger transition costs	0	54,174	0	54,174
General and administrative expense	(39,750)	(37,406)	(123,373)	(107,011)
Depreciation and amortization expense	(195,046)	(152,338)	(586,821)	(309,914)
Loss on real estate assets held for sale	(8,961)	0	(63,620)	0
Interest expense	(142,855)	(122,899)	(412,875)	(289,370)
Non-cash interest expense related to amortization of discount on Life Storage unsecured senior notes	(11,005)	(8,228)	(32,563)	(8,228)
Interest income	34,947	22,092	89,746	62,607
Equity in earnings and dividend income from unconsolidated real estate entities	16,246	15,043	48,508	38,602
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	13,730	0
Impairment of trade name	(51,763)	0	(51,763)	0
Income tax expense	(10,857)	(6,944)	(27,443)	(17,238)
Operating Segments
Segment Reporting Information [Line Items]
Revenues:	794,922	720,015	2,345,118	1,690,861
Operating expenses:	226,545	204,324	666,101	454,698
Net operating income:	568,377	515,691	1,679,017	1,236,163
Self-Storage Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenues:	710,874	650,887	2,096,018	1,525,596
Operating expenses:	209,035	185,194	610,455	416,997
Net operating income:	501,839	465,693	1,485,563	1,108,599
Tenant Reinsurance | Operating Segments
Segment Reporting Information [Line Items]
Revenues:	84,048	69,128	249,100	165,265
Operating expenses:	17,510	19,130	55,646	37,701
Net operating income:	$ 66,538	$ 49,998	$ 193,454	$ 127,564