Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Detail)

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Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Property
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Encumbered properties | Property 99  
Carrying Value $ 538,412 $ 502,599
Stated Interest Rates One month LIBOR was approximately 0.19%  
Libor rate 0.19%  
Line of Credit [Member]    
Debt Instrument [Line Items]    
Encumbered properties | Property 20  
Carrying Value $ 55,500 43,300
Stated Interest Rates LIBOR + 2.75%  
Libor rate 2.75%  
Scheduled Maturity Dates Aug. 01, 2017  
Premiums and Discounts (Net) [Member]    
Debt Instrument [Line Items]    
Carrying Value $ 476 707
Fixed Rate Mortgage Loans [Member]    
Debt Instrument [Line Items]    
Encumbered properties | Property 71  
Carrying Value $ 452,866 450,392
Variable Rate Mortgage Loans [Member]    
Debt Instrument [Line Items]    
Encumbered properties | Property 8  
Carrying Value $ 29,570 8,200
Stated Interest Rates Variable rate mortgage notes payable vary from one month LIBOR + 2.15% to one month LIBOR + 2.25%  
Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Encumbered properties | Property 79  
Carrying Value $ 482,912 $ 459,299