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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Investment in storage facilities, net $ 3,675,617   $ 3,675,617   $ 3,697,096
Other assets 9,329   9,329   4,863
Total Assets 3,869,334   3,869,334   3,876,774
Mortgages payable 12,397   12,397   12,674
Total Liabilities 1,839,267   1,839,267   1,829,078
Unaffiliated partners’ equity 0   0   0
Company equity 2,009,561   2,009,561   2,028,323
Total Equity 2,009,561   2,009,561   $ 2,028,323
Depreciation and amortization of customer list (27,291) $ (26,149) (76,839) $ (101,896)  
Amortization of financing fees     (2,672) (2,496)  
Income tax expense (800) (900) (1,900) 1,300  
Interest expense (17,923) $ (16,290) (52,645) $ (47,216)  
Unconsolidated Joint Ventures [Member]          
Schedule of Equity Method Investments [Line Items]          
Investment in storage facilities, net 1,074,916   1,074,916    
Investment in office building, net 4,669   4,669    
Other assets 19,554   19,554    
Total Assets 1,099,139   1,099,139    
Due to the Company 742   742    
Mortgages payable 458,690   458,690    
Other liabilities 7,043   7,043    
Total Liabilities 466,475   466,475    
Unaffiliated partners’ equity 497,724   497,724    
Company equity 134,940   134,940    
Total Equity 632,664   632,664    
Total Liabilities and Partners’ Equity $ 1,099,139   1,099,139    
Total revenues     84,591    
Property operating expenses     (26,249)    
Administrative, management and call center fees     (6,640)    
Depreciation and amortization of customer list     (19,096)    
Amortization of financing fees     (731)    
Income tax expense     (232)    
Interest expense     (13,284)    
Net income     $ 18,359