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Commercial Mortgage Loan Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Apr. 30, 2012
Room
Dec. 31, 2012
Dec. 31, 2012
Commercial mortgage loans [Member]
Dec. 31, 2011
Commercial mortgage loans [Member]
Dec. 31, 2012
Commercial mortgage loans [Member]
Hotel [Member]
New York [Member]
Room
Dec. 31, 2011
Commercial mortgage loans [Member]
Hotel [Member]
New York [Member]
Room
Dec. 31, 2012
Commercial mortgage loans [Member]
Hotel [Member]
Maryland [Member]
Room
Dec. 31, 2011
Commercial mortgage loans [Member]
Hotel [Member]
Maryland [Member]
Room
Dec. 31, 2011
Commercial mortgage loans [Member]
Hotel [Member]
New York [Member]
Room
Dec. 31, 2012
Commercial mortgage loans [Member]
Office Condo (Headquarters) - NY, NY [Member]
New York [Member]
sqft
Dec. 31, 2011
Commercial mortgage loans [Member]
Office Condo (Headquarters) - NY, NY [Member]
New York [Member]
sqft
Dec. 31, 2012
Commercial mortgage loans [Member]
Mixed Use [Member]
Massachusetts [Member]
acre
Dec. 31, 2012
Commercial mortgage loans [Member]
Condo Conversion [Member]
New York [Member]
sqft
Mortgage Loans on Real Estate [Line Items]                          
Date of Investment         2010-01 2010-01 2010-03 2010-03 2010-08 2010-02 2010-02 2012-01 2012-12
Maturity Date         2015-02 2015-02 2015-04 2015-04 2012-08 2015-02 2015-02 2013-12 2015-01
Original Face Amount $ 24,000   $ 154,844 $ 110,000 $ 32,000 $ 32,000 $ 26,000 $ 26,000 $ 24,000 $ 28,000 $ 28,000 $ 23,844 $ 45,000
Current Face Amount   393,509 146,550 109,006 31,571 31,798 25,273 25,564 24,000 27,419 27,644 17,287 45,000
Carrying Value   $ 142,921 $ 142,921   $ 31,571   $ 25,273     $ 27,419   $ 14,105 $ 44,553
Coupon 8.00%   7.82% 8.31% 8.25% 8.25% 9.00% 9.00% 8.00% 8.00% 8.00% 1.98% 9.00%
Amortization Schedule         30 years 30 years 25 years 25 years 30 years 30 years 30 years    
Property Size 155       151 151 263 263 155 73,419 73,419 20 119,000