Commitment and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) Property	Mar. 31, 2022 USD ($) Property	Dec. 31, 2022 USD ($)
Commitment And Contingencies [Line Items]
Operating lease, aggregate right-of-use assets	$ 17,100		$ 17,400
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets		Other assets
Operating lease liabilities	$ 16,900		$ 17,100
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesMember		us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Operating lease expenses	$ 700	$ 700
Weighted average remaining lease term	9 years 3 months 18 days
Weighted average discount rate	4.60%
Operating lease commitments	$ 21,312
Number of storage facilities acquired | Property		18
Expansion and enhancement contracts	48,700
Self-storage Facilities [Member]
Commitment And Contingencies [Line Items]
Purchase price of business to be acquired	$ 60,000
Number of storage facilities acquired | Property	3