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Subordinate Loans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Ski Resort - California [Member]
Dec. 31, 2012
Ski Resort - California [Member]
Dec. 31, 2011
Ski Resort - California [Member]
Mortgage Loans on Real Estate [Line Items]              
Loan closed/ First mortgage   $ 246,959 $ 149,086 $ 58,985 $ 40,000 $ 40,000 $ 40,000
Amendment fee 0.50%            
Exit fee 1.00%            
Interest rate on the mezzanine loan minimum         0.75%    
Interest rate on the mezzanine loan maximum           14.00%