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Subordinate Loans - Company's Subordinate Loan Portfolio (Detail) (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 | $ 288,014 | $ 245,875
Current Face Amount | 287,935 | 246,959
Carrying Value | 286,569 | 246,246
Coupon | 12.24% | 12.46%
Senior Mezz - Retail - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment |  | 2009-12
Maturity Date |  | 2019-12
Original Face Amount |  | 30,000
Current Face Amount |  | 30,000
Carrying Value |  | 30,000
Coupon |  | Fixed
Junior Mezz - Retail - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment |  | 2009-12
Maturity Date |  | 2019-12
Original Face Amount |  | 20,000
Current Face Amount |  | 20,000
Carrying Value |  | 20,000
Coupon |  | Fixed
Office - Michigan [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2010-05 | 2010-05
Maturity Date | 2020-06 | 2020-06
Original Face Amount | 9,000 | 9,000
Current Face Amount | 8,897 | 8,912
Carrying Value | 8,897 | 8,912
Coupon | Fixed | Fixed
Ski Resort - California [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2011-04 | 2011-04
Maturity Date | 2017-05 | 2017-05
Original Face Amount | 40,000 | 40,000
Current Face Amount | 40,000 | 40,000
Carrying Value | 39,855 | 39,831
Coupon | Fixed | Fixed
Hotel Portfolio - New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2011-08 | 2011-08
Maturity Date | 2013-07 | 2013-07
Original Face Amount | 25,000 | 25,000
Current Face Amount | 25,000 | 25,000
Carrying Value | 25,000 | 25,000
Coupon | Floating | Floating
Retail Center - Virginia [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2011-10 | 2011-10
Maturity Date | 2014-10 | 2014-10
Original Face Amount | 25,000 | 25,000
Current Face Amount | 24,442 | 26,243
Carrying Value | 24,442 | 26,243
Coupon | Fixed | Fixed
Hotel NY NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-01 | 2012-01
Maturity Date | 2014-02 | 2014-02
Original Face Amount | 15,000 | 15,000
Current Face Amount | 15,000 | 15,000
Carrying Value | 15,058 | 15,013
Coupon | Fixed | Fixed
Hotel - New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-03 | 2012-03
Maturity Date | 2014-03 | 2014-03
Original Face Amount | 15,000 | 15,000
Current Face Amount | 15,000 | 15,000
Carrying Value | 15,000 | 15,000
Coupon | Floating | Floating
Mixed Use - North Carolina [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-07 | 2012-07
Maturity Date | 2022-07 | 2022-07
Original Face Amount | 6,525 | 6,525
Current Face Amount | 6,525 | 6,525
Carrying Value | 6,525 | 6,525
Coupon | Fixed | Fixed
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-09 | 2012-09
Maturity Date | 2022-10 | 2022-10
Original Face Amount | 10,000 | 10,000
Current Face Amount | 9,945 | 9,979
Carrying Value | 9,945 | 9,979
Coupon | Fixed | Fixed
Hotel Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-11 | 2012-11
Maturity Date | 2015-11 | 2015-11
Original Face Amount | 50,000 | 50,000
Current Face Amount | 49,799 | 49,950
Carrying Value | 49,620 | 49,743
Coupon | Floating | Floating
Condo Conversion - NY, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-12 | 2012-12
Maturity Date | 2015-01 | 2015-01
Original Face Amount | 350 | 350
Current Face Amount | 350 | 350
Coupon | Floating | Floating
Condo Construction - NY, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2013-01 |
Maturity Date | 2017-07 |
Original Face Amount | 49,139 |
Current Face Amount | 50,009 |
Carrying Value | 49,420 |
Coupon | Fixed |
Multifamily Conversion - NY, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2013-01 |
Maturity Date | 2014-12 |
Original Face Amount | 18,000 |
Current Face Amount | 18,000 |
Carrying Value | 17,839 |
Coupon | Floating |
Hotel Portfolio - Rochester, MN [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2013-01 |
Maturity Date | 2018-02 |
Original Face Amount | 25,000 |
Current Face Amount | 24,968 |
Carrying Value | $ 24,968 |
Coupon | Fixed |

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