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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.

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