Investment in Storage Facilities and Intangible Assets - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Property	Sep. 30, 2021 USD ($) Property $ / shares	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investment Holdings [Line Items]
Number of storage facilities acquired | Property				43	62
Minority Interest Ownership Percentage	17.00%
Noncontrolling interest in consolidated subsidiary		$ 4,924		$ 4,924			$ 0
Net other liabilities assumed				$ (3,600)
Amortization period for in-place customer leases on a straight-line basis				12 months
Increase in depreciation expense due to facility replacement		200		$ 2,500
Issuance of Operating Partnership Units				10,300
Accelerated depreciation reduced basic and diluted earnings per share | $ / shares					$ 0.03
NY [Member]
Investment Holdings [Line Items]
Ownership percentage in joint venture	83.00%
Carrying value of investment		24,100		24,100
Total consideration acquired	$ 29,000
Retained interest in joint venture	$ 4,900
Net investment in joint venture		24,100		24,100
Depreciation and Amortization Expense [Member]
Investment Holdings [Line Items]
Amortization expense related to in-place customer leases		$ 5,000	$ 3,600	16,100	$ 8,400
Life Storage 898 McDonald LLC [Member]
Investment Holdings [Line Items]
Issuance of Operating Partnership Units				$ 10,300
Life Storage 898 McDonald LLC [Member] | NY [Member]
Investment Holdings [Line Items]
Company common ownership interest						14.20%
Carrying value of investment						$ 30,200
Net investment in joint venture						$ 30,200