Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]        
Investment in storage facilities, net $ 3,694,258 $ 3,697,096    
Other assets 5,921 4,863    
Total Assets 3,892,212 3,876,774    
Mortgages payable 12,302 12,674    
Total Liabilities 1,810,759 1,829,078    
Unaffiliated partners’ equity 0 0    
Company equity 2,057,737 2,028,323 $ 2,088,494 $ 1,202,315
Total Equity 2,057,737 2,028,323    
Depreciation and amortization of customer list (102,530) (127,485) (117,081)  
Amortization of financing fees (3,621) (4,289) (9,688)  
Interest expense (70,672) $ (74,362) $ (47,175)  
Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment in storage facilities, net 1,193,499      
Investment in office building, net 4,621      
Other assets 19,381      
Total Assets 1,217,501      
Due to the Company 1,006      
Mortgages payable 525,299      
Other liabilities 8,218      
Total Liabilities 534,523      
Unaffiliated partners’ equity 537,514      
Company equity 145,464      
Total Equity 682,978      
Total Liabilities and Partners’ Equity 1,217,501      
Total revenues 113,667      
Property operating expenses (33,794)      
Administrative, management and call center fees (9,038)      
Depreciation and amortization of customer list (25,674)      
Amortization of financing fees (1,103)      
Income tax expense (302)      
Interest expense (18,930)      
Net income $ 24,826