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Mortgage Indebtedness - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sponsor
   
Mortgage Loans on Real Estate [Line Items]    
Debt $ 38,075  
Interest paid 238 241
Third Parties
   
Mortgage Loans on Real Estate [Line Items]    
Debt 54,338  
Debt sold to third parties