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Commercial Mortgage Loans - Commercial Mortgage Loan Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 154,844 $ 154,844
Current Face Amount 145,737 146,550
Carrying Value 143,492 142,921
Coupon 7.84% 7.82%
Maryland [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Coupon Fixed  
Hotel [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Jan-10 Jan-10
Maturity Date Feb-15 Feb-15
Original Face Amount 32,000 32,000
Current Face Amount 31,443 31,571
Carrying Value 31,443 31,571
Coupon Fixed Fixed
Number of hotel rooms 151 151
Hotel [Member] | Maryland [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Mar-10 Mar-10
Maturity Date Apr-15 Apr-15
Original Face Amount 26,000 26,000
Current Face Amount 25,111 25,273
Carrying Value 24,888 25,273
Coupon   Fixed
Number of hotel rooms 263 263
Office Condo (Headquarters) - NY, NY | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Feb-10 Feb-10
Maturity Date Feb-15 Feb-15
Original Face Amount 28,000 28,000
Current Face Amount 27,293 27,419
Carrying Value 27,293 27,419
Coupon Fixed Fixed
Area of building (in square feet) 73,419 73,419
Mixed Use [Member] | Massachusetts [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Area of property (in acres) 20 [1] 20 [1]
Mixed Use [Member] | Massachusetts [Member] | First Mortgage [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original first mortgage 120 120,000
Repayment of first mortgage 33 33,000
Option to extend loan agreement, term 1 year 1 year
Mixed Use [Member] | Massachusetts [Member] | First Mortgage [Member] | Senior Sub-participation Interest [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Apr-12 [1] Apr-12 [1]
Maturity Date Dec-13 [1] Dec-13 [1]
Original Face Amount 23,844 [1] 23,844 [1]
Current Face Amount 16,890 [1] 17,287 [1]
Carrying Value 15,215 [1] 14,105 [1]
Coupon Floating [1] Floating [1]
Condo Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Extension options Two one-year Two one-year
Condo Conversion [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Dec-12 [2] Dec-12 [2]
Maturity Date Jan-15 [2] Jan-15 [2]
Original Face Amount 45,000 [2] 45,000 [2]
Current Face Amount 45,000 [2] 45,000 [2]
Carrying Value $ 44,653 [2] $ 44,553 [2]
Coupon Floating [2] Fixed [2]
Area of building (in square feet) 119,000 [2] 119,000 [2]
Option to extend loan agreement, term 1 year 1 year
Number of options to extend loan agreement 2 2
Extension options Two one-year Two one-year
[1] This loan is a senior sub-participation interest in a $120,000 first mortgage. In December 2012, the borrower exercised a one-year extension option subject upon repayment of $33,000 of the entire first mortgage (of which the Company received its pro rata portion) and the payment of a fee on the outstanding balance of the entire first mortgage.
[2] This loan includes two one-year extension options subject to certain conditions and the payment of a fee for each extension.