Schedule III - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Self Storage properties:
Balance at beginning of year	$ 5,792,174	$ 6,391,572	$ 5,798,188
Acquisitions and improvements	81,156	258,560	602,082
Write-off of fully depreciated assets and other	(1,218)	(767)	(1,145)
Dispositions	(7,978)	(226,379)	(7,553)
Reclassification to assets held for sale	0	(630,812)	0
Balance at end of year	5,864,134	5,792,174	6,391,572
Accumulated depreciation:
Balance at beginning of year	874,359	772,661	578,717
Depreciation expense	181,326	210,216	196,207
Write-off of fully depreciated assets and other	(925)	(124)	(371)
Dispositions	(3,122)	(27,781)	(1,892)
Reclassification to assets held for sale	0	(80,613)	0
Balance at end of year	$ 1,051,638	$ 874,359	$ 772,661