Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Additional Information (Detail)

v3.22.0.1
Shareholders' Equity - Additional Information (Detail)
12 Months Ended
Sep. 16, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Property
$ / shares
shares
Dec. 31, 2020
USD ($)
Property
$ / shares
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Jun. 14, 2018
USD ($)
Aug. 02, 2017
USD ($)
Stockholders Equity [Line Items]              
Common stock shares issued under equity offering program | shares     0 0      
Number of storage facilities acquired | Property   112 40        
Common stock, par value | $ / shares   $ 0.01 $ 0.01        
Buyback Program, authorized repurchase amount             $ 200,000,000
Stock repurchased during period, shares | shares     0 0 0    
Shares issued under dividend reinvestment plan | shares     0 0 0    
IPO [Member]              
Stockholders Equity [Line Items]              
Common Stock, Shares, Issued | shares 2,875,000            
Common stock, par value | $ / shares $ 122.30            
Financing and Stock Issuance Costs $ 348,800,000            
Two Thousand Twenty Equity Program [Member]              
Stockholders Equity [Line Items]              
Common stock value authorized under new equity offering program           $ 500,000,000  
Common stock shares issued under equity offering program | shares   6,365,971          
Weighted average issue price | $ / shares   $ 106.51          
Proceeds from issuance of common stock   $ 670,300,000          
Sales commissions paid   6,800,000 $ 3,000,000.0        
Other expenses   900,000          
Two Thousand Eighteen Equity Program [Member]              
Stockholders Equity [Line Items]              
Common stock value authorized under equity offering program           $ 300,000,000  
Common stock shares issued under equity offering program | shares     4,091,666        
Weighted average issue price | $ / shares     $ 73.16        
Proceeds from issuance of common stock     $ 296,000,000.0        
Other expenses     $ 300,000        
Two Thousand Twenty One Equity Program [Member]              
Stockholders Equity [Line Items]              
Common stock value authorized under equity offering program   $ 500,000,000