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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Investment in storage facilities, net $ 3,745,860   $ 3,694,258  
Other assets 30,879   5,921  
Total Assets 3,958,803   3,892,212  
Mortgages payable 12,204   12,302  
Total Liabilities 1,887,968   1,810,759  
Unaffiliated partners’ equity 0   0  
Company equity 2,046,891 $ 2,019,337 2,057,737 $ 2,028,323
Total Equity 2,046,891   $ 2,057,737  
Depreciation and amortization of customer list (26,227) (24,764)    
Amortization of financing fees (903) (891)    
Interest expense (17,819) $ (17,204)    
Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment in storage facilities, net 1,158,144      
Investment in office building, net 4,573      
Other assets 20,759      
Total Assets 1,183,476      
Due to the Company 1,807      
Mortgages payable 516,061      
Other liabilities 11,018      
Total Liabilities 528,886      
Unaffiliated partners’ equity 519,642      
Company equity 134,948      
Total Equity 654,590      
Total Liabilities and Partners’ Equity 1,183,476      
Total revenues 30,915      
Property operating expenses (9,832)      
Administrative, management and call center fees (2,470)      
Depreciation and amortization of customer list (6,823)      
Amortization of financing fees (231)      
Income tax expense (79)      
Interest expense (5,945)      
Net income $ 5,535