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) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Property
Dec. 31, 2013
Debt Instrument [Line Items]    
Encumbered properties 93  
Carrying value $ 505,958 $ 447,002
Stated Interest Rates One month LIBOR was approximately 0.15%.  
Libor rate 0.15%  
Variable Rate Line of Credit [Member]
   
Debt Instrument [Line Items]    
Encumbered properties 17  
Carrying value 45,600 24,400
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 783 724
Fixed Rate Mortgage Loans [Member]
   
Debt Instrument [Line Items]    
Encumbered properties 72  
Carrying value 451,375 413,678
Variable Rate Mortgage Loans [Member]
   
Debt Instrument [Line Items]    
Encumbered properties 4  
Carrying value 8,200 8,200
Stated Interest Rates LIBOR + 2.15%  
Libor rate 2.15%  
Scheduled Maturity Dates Dec. 01, 2016  
Mortgages Notes Payable [Member]
   
Debt Instrument [Line Items]    
Encumbered properties 76  
Carrying value $ 460,358 $ 422,602