Quarterly report pursuant to Section 13 or 15(d)

Investment in Joint Ventures - Summary of Unconsolidated Joint Ventures' Financial Statements (Detail)

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Investment in Joint Ventures - Summary of Unconsolidated Joint Ventures' Financial Statements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                
Investment in storage facilities, net $ 4,087,667   $ 4,087,667     $ 3,993,140    
Other assets 27,697   27,697     29,591    
Total Assets 4,311,264   4,311,264     4,232,964    
Mortgages payable 34,519   34,519     34,851    
Total Liabilities 2,155,615   2,155,615     2,073,763    
Unaffiliated partners’ equity 0   0     0    
Company equity 2,132,681 $ 2,041,920 2,132,681 $ 2,041,920 $ 2,147,719 2,132,894 $ 2,046,891 $ 2,057,737
Total Equity 2,132,681   2,132,681     2,132,894    
Total Liabilities and Shareholders' Equity/ Partners' Capital 4,311,264   4,311,264     $ 4,232,964    
Total revenues 147,013 145,028 293,956 281,552        
Depreciation and amortization of customer list (28,987) (26,158) (57,317) (52,387)        
Amortization of financing fees     (2,025) (1,846)        
Interest expense (20,266) (18,759) (40,513) (36,578)        
Net income 36,648 $ 40,964 73,273 $ 75,600        
Unconsolidated Joint Ventures [Member]                
Schedule of Equity Method Investments [Line Items]                
Investment in storage facilities, net 1,235,973   1,235,973          
Investment in office building, net 4,246   4,246          
Other assets 27,432   27,432          
Total Assets 1,267,651   1,267,651          
Due to the Company 796   796          
Mortgages payable 544,321   544,321          
Other liabilities 23,068   23,068          
Total Liabilities 568,185   568,185          
Unaffiliated partners’ equity 552,062   552,062          
Company equity 147,404   147,404          
Total Equity 699,466   699,466          
Total Liabilities and Shareholders' Equity/ Partners' Capital $ 1,267,651   1,267,651          
Total revenues     66,337          
Property operating expenses     (20,367)          
Administrative, management and call center fees     (5,112)          
Gain on disposal of self-storage facilities     33,038          
Depreciation and amortization of customer list     (15,706)          
Amortization of financing fees     (402)          
Income tax expense     (162)          
Interest expense     (12,055)          
Net income     $ 45,571