Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Additional Information (Detail)

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Shareholders' Equity - Additional Information (Detail)
3 Months Ended
Jan. 15, 2021
Jan. 04, 2021
Mar. 31, 2022
USD ($)
Property
$ / shares
shares
Mar. 31, 2021
USD ($)
Property
$ / shares
shares
Dec. 31, 2021
$ / shares
Jun. 15, 2021
USD ($)
Jun. 14, 2018
USD ($)
Aug. 02, 2017
USD ($)
Stockholders Equity [Line Items]                
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.01   $ 0.01      
Number of storage facilities acquired | Property     18 16        
Buyback Program, authorized repurchase amount               $ 200,000,000
Stock repurchased during period, shares | shares     0 0        
Shares issued under dividend reinvestment plan | shares     0 0        
Description of stock split of common stock   three-for-two            
Stock dividend payable percentage of common stock   50.00%            
Description of additional share received Shareholders of record at the close of business on January 15, 2021 received one additional share of Company stock for every two shares owned.              
2020 Equity Program [Member]                
Stockholders Equity [Line Items]                
Common stock value authorized under equity offering program             $ 500,000,000  
Common stock shares issued under equity offering program | shares       2,220,559        
Weighted average issue price | $ / shares     $ 136.48 $ 82.23        
Proceeds from issuance of common stock     $ 92,800,000 $ 180,500,000        
Sales commissions paid     $ 900,000 1,800,000        
Other expenses       $ 300,000        
2021 Equity Program [Member]                
Stockholders Equity [Line Items]                
Common stock value authorized under equity offering program           $ 500,000,000    
Common stock shares issued under equity offering program | shares     686,712