Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.22.0.1
Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 26, 2022
USD ($)
Jan. 03, 2022
$ / shares
Jan. 01, 2022
USD ($)
Property
Jan. 04, 2021
Jan. 31, 2022
USD ($)
Property
$ / shares
shares
Dec. 31, 2021
USD ($)
Property
Dec. 31, 2020
USD ($)
Property
shares
Dec. 31, 2019
shares
Subsequent Event [Line Items]                
Description of stock split of common stock       three-for-two        
Number of storage facilities acquired | Property           112 40  
Purchase Price Of Assets Acquired           $ 1,696,317 $ 532,625  
Net proceeds from issuance of common stock/Operating Partnership Units, shares | shares             0 0
Self-storage Facilities [Member]                
Subsequent Event [Line Items]                
Number of storage facilities acquired | Property           10    
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Dividend declared, date   Jan. 03, 2022            
Dividend per common share | $ / shares   $ 1.00            
Dividend paid, date   Jan. 26, 2022            
Dividend record, date   Jan. 14, 2022            
Dividend paid $ 83,600              
Purchase Price Of Assets Acquired     $ 236,200          
Subsequent Event [Member] | Equity Program [Member]                
Subsequent Event [Line Items]                
Net proceeds from issuance of common stock/Operating Partnership Units, shares | shares         74,127      
Weighted average issue price | $ / shares         $ 151.58      
Proceeds from issuance of common stock         $ 11,100      
Subsequent Event [Member] | Self-storage Facilities [Member]                
Subsequent Event [Line Items]                
Total consideration acquired         $ 165,000      
Number of storage facilities acquired | Property     15   6