Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Investment in Joint Ventures - Summary of Unconsolidated Joint Ventures' Financial Statements (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Investment in storage facilities, net $ 2,353,127   $ 2,026,507
Other assets 12,900   9,048
Total Assets 2,449,483   2,118,822
Mortgages payable 1,959   1,993
Total Liabilities 962,839   898,336
Unaffiliated partners' equity 428    
Company equity 1,462,003   1,202,315
Total Partners' Equity 1,462,431   $ 1,202,315
Depreciation and amortization of customer list (16,425) $ (14,181)  
Amortization of financing fees (356) (296)  
Income tax expense (600) (400)  
Interest expense (9,134) $ (9,161)  
Unconsolidated Joint Ventures [Member]      
Schedule of Equity Method Investments [Line Items]      
Investment in storage facilities, net 527,662    
Investment in office building 5,007    
Other assets 17,238    
Total Assets 549,907    
Due to the Company 672    
Mortgages payable 223,401    
Other liabilities 6,006    
Total Liabilities 230,079    
Unaffiliated partners' equity 257,098    
Company equity 62,730    
Total Partners' Equity 319,828    
Total Liabilities and Partners' Equity (Deficiency) 549,907    
Total revenues 18,005    
Property operating expenses (5,951)    
Administrative, management and call center fees (1,303)    
Depreciation and amortization of customer list (3,106)    
Amortization of financing fees (89)    
Income tax expense (58)    
Interest expense (2,574)    
Net income $ 4,924