Quarterly report pursuant to Section 13 or 15(d)

Commitment and Contingencies - Additional Information (Detail)

v3.21.2
Commitment and Contingencies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 02, 2021
Property
Jul. 01, 2021
Property
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Property
Jun. 30, 2020
USD ($)
Property
Dec. 31, 2020
USD ($)
Commitment And Contingencies [Line Items]              
Operating lease, aggregate right-of-use assets     $ 20,100   $ 20,100   $ 20,300
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]     us-gaap:OtherAssetsMember   us-gaap:OtherAssetsMember   us-gaap:OtherAssetsMember
Operating lease liabilities     $ 19,500   $ 19,500   $ 19,900
Operating Lease, Liability, Statement of Financial Position [Extensible List]     us-gaap:AccountsPayableAndAccruedLiabilitiesMember   us-gaap:AccountsPayableAndAccruedLiabilitiesMember   us-gaap:AccountsPayableAndAccruedLiabilitiesMember
Operating lease expenses     $ 600 $ 500 $ 1,200 $ 1,000  
Weighted average remaining lease term     11 years 1 month 6 days   11 years 1 month 6 days    
Weighted average discount rate     4.71%   4.71%    
Operating lease commitments     $ 24,631   $ 24,631    
Number of storage facilities acquired | Property         33 6  
Purchase Price         $ 533,710    
Expansion and enhancement contracts         62,800    
Self-storage Facilities [Member]              
Commitment And Contingencies [Line Items]              
Purchase price of business to be acquired         $ 54,100    
Number of storage facilities acquired | Property         4    
Self-storage Facilities [Member] | Facility Acquired [Member]              
Commitment And Contingencies [Line Items]              
Number of storage facilities acquired | Property         2    
Purchase Price         $ 22,100    
Self-storage Facilities [Member] | Subsequent Event [Member]              
Commitment And Contingencies [Line Items]              
Number of storage facilities acquired | Property 4 2