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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.

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