Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Line of Credit - Summary of Interest Rate Cap Agreement (Detail)

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Mortgage Notes Payable and Line of Credit - Summary of Interest Rate Cap Agreement (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Notional Amount $ 29,570,000 $ 8,200,000
Cost 99,000 31,000
Fair Value $ 19,000 4,000
Interest Rate Cap Agreement November 2013 [Member]    
Debt Instrument [Line Items]    
Date of Issuance Nov. 30, 2013  
LIBOR Cap 3.00%  
Maturity Date Dec. 01, 2016  
Notional Amount $ 8,200,000 8,200,000
Cost $ 31,000 31,000
Fair Value   $ 4,000
Interest Rate Cap Agreement July 2015 [Member]    
Debt Instrument [Line Items]    
Date of Issuance Jul. 31, 2015  
LIBOR Cap 3.00%  
Maturity Date Jul. 01, 2018  
Notional Amount $ 21,370,000  
Cost 68,000  
Fair Value $ 19,000