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Commercial Mortgage Loans - Commercial Mortgage Loan Portfolio (Detail) (Commercial mortgage loans [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 154,844 $ 154,844
Current Face Amount 145,928 146,550
Carrying Value 142,833 142,921
Coupon 7.84% 7.82%
Hotel [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment 2010-01 2010-01
Maturity Date 2015-02 2015-02
Original Face Amount 32,000 32,000
Current Face Amount 31,501 31,571
Carrying Value 31,501 31,571
Coupon Fixed Fixed
Property Size 151 151
Hotel [Member] | Maryland [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment 2010-03 2010-03
Maturity Date 2015-04 2015-04
Original Face Amount 26,000 26,000
Current Face Amount 25,186 25,273
Carrying Value 24,935 25,273
Coupon Fixed Fixed
Property Size 263 263
Office Condo (Headquarters) - NY, NY [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment 2010-02 2010-02
Maturity Date 2015-02 2015-02
Original Face Amount 28,000 28,000
Current Face Amount 27,351 27,419
Carrying Value 27,351 27,419
Coupon Fixed Fixed
Property Size 73,419 73,419
Mixed Use [Member] | Massachusetts [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment 2012-04 2012-04
Maturity Date 2013-12 2013-12
Original Face Amount 23,844 23,844
Current Face Amount 16,890 17,287
Carrying Value 14,444 14,105
Coupon Floating Floating
Property Size 20 20
Condo Conversion [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment 2012-12 2012-12
Maturity Date 2015-01 2015-01
Original Face Amount 45,000 45,000
Current Face Amount 45,000 45,000
Carrying Value $ 44,602 $ 44,553
Coupon Floating Fixed
Property Size 119,000 119,000