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Commercial Mortgage Loans - Commercial Mortgage Loan Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 164,000 $ 154,844
Current Face Amount 161,653 146,550
Carrying Value 160,893 142,921
Coupon 8.83% 7.82%
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 31,385 31,571
Carrying Value 31,385 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 25,033 25,273
Carrying Value 24,840 25,273
Coupon Fixed 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 27,235 27,419
Carrying Value 27,235 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   120,000
Repayment of first mortgage   33,000
Option to extend loan agreement, term   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 [2]
Maturity Date   Dec-13 [2]
Original Face Amount   23,844 [2]
Current Face Amount   17,287 [2]
Carrying Value   14,105 [2]
Coupon   Floating [2]
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 [3] Dec-12 [1]
Maturity Date Jan-15 [3] Jan-15 [1]
Original Face Amount 45,000 [3] 45,000 [1]
Current Face Amount 45,000 [3] 45,000 [1]
Carrying Value 44,732 [3] 44,553 [1]
Coupon Floating [3] Fixed [1]
Area of building (in square feet) 119,000 [3] 119,000 [3]
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
Condo Conversion1 [Member] | New York [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Date of Investment Aug-13 [3]  
Maturity Date Sept-15 [3]  
Original Face Amount 33,000 [3]  
Current Face Amount 33,000 [3]  
Carrying Value $ 32,701 [3]  
Coupon Floating [3]  
Area of building (in square feet) 40,000 [3] 40,000 [3]
Option to extend loan agreement, term 1 year  
[1] This loan includes two one-year extension options subject to certain conditions and the payment of a fee for each extension.
[2] 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 which was subject to repayment of $33,000 of the entire first mortgage loan (of which the Company received its pro rata portion) and the payment of a fee on the outstanding balance of the entire first mortgage loan.
[3] This loan includes a one-year extension option subject to certain conditions and the payment of a fee.