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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