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Subordinate Loan Portfolio (Detail) (Subordinate Loans [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount $ 480,319   $ 495,319
Current Face Amount 487,487   500,037
Carrying Value 484,979   497,484
Coupon rate of loan 11.60% 11.60%  
Office [Member] | Office - Michigan [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 9,000   9,000
Current Face Amount 8,849   8,866
Carrying Value 8,849   8,866
Office [Member] | Office Complex - Missouri [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 10,000   10,000
Current Face Amount 9,814   9,849
Carrying Value 9,814   9,849
Office [Member] | Office Condo - NY, NY [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 14,000   14,000
Current Face Amount 14,000   14,000
Carrying Value 13,572   13,565
Ski Resort [Member] | Ski Resort - California [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 40,000   40,000
Current Face Amount 40,000   40,000
Carrying Value 39,632   39,781
Hotel [Member] | Hotel - New York [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount     15,000
Current Face Amount     15,000
Carrying Value     15,207
Hotel [Member] | Hotel Portfolio - Various [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 50,000   50,000
Current Face Amount 48,271   48,431
Carrying Value 48,277   48,397
Hotel [Member] | Hotel Portfolio - Rochester, MN [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 25,000   25,000
Current Face Amount 24,696   24,771
Carrying Value 24,696   24,771
Mixed Use [Member] | Mixed Use - North Carolina [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 6,525   6,525
Current Face Amount 6,525   6,525
Carrying Value 6,525   6,525
Mixed Use [Member] | Mixed Use - Pittsburgh, PA [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 22,500   22,500
Current Face Amount 22,500   22,500
Carrying Value 22,378   22,342
Mixed Use [Member] | Mixed Use - Florida [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 50,000   50,000
Current Face Amount 50,000   50,000
Carrying Value 49,611   49,535
Mixed Use [Member] | Mixed Use - Various [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 17,000   17,000
Current Face Amount 17,500   17,000
Carrying Value 17,312   16,805
Condo Conversion [Member] | Condo Conversion - NY, NY [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 35,000   35,000
Current Face Amount 35,000   35,000
Carrying Value 34,878   34,734
Condo Conversion [Member] | Condo Conversion - NY, NY September 2015 [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 294   294
Current Face Amount 297   295
Carrying Value 1   2
Condo Construction [Member] | Condo Construction - NY, NY [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 60,000   60,000
Current Face Amount 69,035   66,800
Carrying Value 68,565   66,340
Multifamily Conversion [Member] | Multifamily Conversion - NY, NY December 2014 [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 18,000   18,000
Current Face Amount 18,000   18,000
Carrying Value 17,932   17,906
Multifamily Conversion [Member] | Multifamily Conversion - NY, NY June 2014 [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 44,000   44,000
Current Face Amount 44,000   44,000
Carrying Value 43,937   43,859
Warehouse [Member] | Warehouse Portfolio - Various [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 32,000   32,000
Current Face Amount 32,000   32,000
Carrying Value 32,000   32,000
Healthcare [Member] | Healthcare Portfolio - Various [Member]
     
Mortgage Loans on Real Estate [Line Items]      
Original Face Amount 47,000   47,000
Current Face Amount 47,000   47,000
Carrying Value $ 47,000   $ 47,000