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Fair Value - Information About our Fixed Rate Financial instruments not Measured at Fair Value (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Loan secured by real estate $ 18,507,000 $ 20,666,000  
Loan Secured by Real Estate Fair Value 35,824,000     
Valuation Techniques     Level 2
Fixed rate debt, carrying value (3,989,000) (29,931,000)  
Fixed rate debt, fair value $ (4,070,000) $ (32,478,000)