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Summary of Information Concerning Indebtedness that Encumbered our Properties (Parenthetical) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items]    
Secured credit facility borrowing capacity $ 325,000,000 $ 325,000,000
Credit facility outstanding $ 325,000,000 $ 271,500,000
Bridge Term Loan    
Mortgage Loans On Real Estate [Line Items]    
Debt instrument, maturity date   Mar. 31, 2017
Extended Maturity | Bridge Term Loan    
Mortgage Loans On Real Estate [Line Items]    
Mortgage indebtedness maturity (in years)   6 months
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