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Mortgage Indebtedness - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]          
Interest paid     $ 1,752 $ 1,575  
Sponsor
         
Mortgage Loans on Real Estate [Line Items]          
Debt 38,075   38,075   38,075
Interest paid 241 241 479 481  
Third Parties
         
Mortgage Loans on Real Estate [Line Items]          
Debt $ 54,285   $ 54,285   $ 54,338