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Summary of Information Concerning Indebtedness that Encumbered our Properties (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Mortgage Loans On Real Estate [Line Items]    
Secured credit facility borrowing capacity $ 325.0 $ 30.0
Credit facility outstanding $ 271.5 $ 18.4
Bridge Term Loan    
Mortgage Loans On Real Estate [Line Items]    
Debt instrument, maturity date Mar. 31, 2017  
Bridge Term Loan | Extended Maturity    
Mortgage Loans On Real Estate [Line Items]    
Mortgage indebtedness maturity (in years) 6 months