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Company's Subordinate Loan Portfolio (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Ski Resort - California [Member]
Dec. 31, 2011
Ski Resort - California [Member]
Jun. 30, 2012
Ski Resort - California [Member]
Dec. 31, 2012
Hotel Portfolio - New York [Member]
Dec. 31, 2011
Hotel Portfolio - New York [Member]
Dec. 31, 2012
Retail Center - Virginia [Member]
Dec. 31, 2011
Retail Center - Virginia [Member]
Dec. 31, 2012
Senior Mezz - Retail - Various [Member]
Dec. 31, 2011
Senior Mezz - Retail - Various [Member]
Dec. 31, 2010
Senior Mezz - Retail - Various [Member]
Dec. 31, 2012
Junior Mezz - Retail - Various [Member]
Dec. 31, 2011
Junior Mezz - Retail - Various [Member]
Dec. 31, 2010
Junior Mezz - Retail - Various [Member]
Dec. 31, 2012
Office - Michigan [Member]
Dec. 31, 2011
Office - Michigan [Member]
Dec. 31, 2012
Hotel NY NY [Member]
Dec. 31, 2012
Hotel - New York [Member]
Dec. 31, 2012
Mixed Use - North Carolina [Member]
Dec. 31, 2012
Office [Member]
Dec. 31, 2012
Hotel Portfolio - Various [Member]
Dec. 31, 2012
Condo Conversion - NY, NY [Member]
Dec. 31, 2010
Office-Troy, MI
Dec. 31, 2012
Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]                                                    
Date of Investment       2011-04 2011-04   2011-08 2011-08 2011-10 2011-10 2009-12 2009-12 2009-12 2009-12 2009-12 2009-12 2010-05 2010-05 2012-01 2012-03 2012-07 2012-09 2012-11 2012-12 2010-05  
Maturity Date       2017-05 2017-05   2013-07 2013-07 2014-10 2014-10 2019-12 2019-12 2019-12 2019-12 2019-12 2019-19 2020-06 2020-06 2014-02 2014-03 2022-07 2022-10 2015-11 2015-01 2020-06  
Original Face Amount $ 245,875,000 $ 149,000,000 $ 59,000,000 $ 40,000,000 $ 40,000,000   $ 25,000,000 $ 25,000,000 $ 25,000,000 $ 25,000,000 $ 30,000,000 $ 30,000,000 $ 30,000,000 $ 20,000,000 $ 20,000,000 $ 20,000,000 $ 9,000,000 $ 9,000,000 $ 15,000,000 $ 15,000,000 $ 6,525,000 $ 10,000,000 $ 50,000,000 $ 350,000 $ 9,000,000  
Current Face Amount 246,959,000 149,086,000 58,985,000 40,000,000 40,000,000 40,000,000 25,000,000 25,000,000 26,243,000 25,136,000 30,000,000 30,000,000 30,000,000 20,000,000 20,000,000 20,000,000 8,912,000 8,950,000 15,000,000 15,000,000 6,525,000 9,979,000 49,950,000 350,000 8,985,000  
Carrying Value 246,246,000     39,831,000     25,000,000   26,243,000   30,000,000     20,000,000     8,912,000   15,013,000 15,000,000 6,525,000 9,979,000 49,743,000      
Coupon 12.46% 13.00% 12.95% 14.00% 13.25%   11.49% 11.49% 14.00% 14.00% 12.24% 12.24% 12.24% 14.00% 14.00% 14.00% 13.00% 13.00% 12.00% 11.50% 11.10% 11.75% 11.11% 9.00% 13.00%  
Amortization Schedule                                 25 years 25 years       30 years 30 years   25 years  
Unfunded loan commitments $ 34,650,000                                                 $ 34,650