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Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Aug. 01, 2019
USD ($)
Property
Jul. 26, 2019
USD ($)
Jul. 02, 2019
USD ($)
Property
$ / shares
Jul. 01, 2019
USD ($)
Property
Jun. 30, 2019
USD ($)
Property
Subsequent Event [Line Items]          
Number of storage facilities acquired | Property         6
Cash payments for property acquisition | $         $ 95,819
Number of storage facility leased by company | Property         1
Self-storage Facilities [Member]          
Subsequent Event [Line Items]          
Number of storage facilities sold | Property         32
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividend declared, date     Jul. 02, 2019    
Dividend per common share | $ / shares     $ 1.00    
Dividend paid, date     Jul. 26, 2019    
Dividend record, date     Jul. 16, 2019    
Dividend paid | $   $ 46,700      
Number of storage facilities acquired | Property 6     12  
Cash payments for property acquisition | $ $ 76,100     $ 134,800  
Subsequent Event [Member] | Self-storage Facilities [Member]          
Subsequent Event [Line Items]          
Number of storage facilities sold | Property     32    
Cash consideration, net of related cost | $     $ 208,800    
Gain on sale of storage facilities | $     $ 101,000