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Subordinate Loans - Loans Portfolio (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
ft²
unit
bed
key
Dec. 31, 2015
USD ($)
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 10,726 $ 26,328
Carrying Value 5,606 26,095
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance   6,386
Carrying Value   6,415
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance   12,347
Carrying Value   12,222
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance 5,726 2,595
Carrying Value $ 5,606 2,458
Property size, number of units/keys | key 317  
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily - Williston, ND [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 5,000 5,000
Carrying Value $ 0 5,000
Property size, number of units/keys | unit 366  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 923,697 912,678
Carrying Value 917,553 905,256
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance 55,908 52,418
Carrying Value $ 55,579 51,941
Property size, number of units/keys | unit 223  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY - January 2016 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 31,558  
Carrying Value $ 30,795  
Property size, number of units/keys | unit 139  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - North Carolina [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 6,525 6,525
Carrying Value $ 6,525 6,525
Property size, area (in square feet) | ft² 170,897  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance   19,500
Carrying Value   19,377
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - London, England [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 45,776 50,676
Carrying Value $ 45,776 50,676
Property size, area (in square feet) | ft² 210,000  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 94,190 88,368
Carrying Value $ 93,915 87,818
Property size, number of units/keys | unit 363  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 45,000 45,000
Carrying Value $ 44,978 44,854
Property size, area (in square feet) | ft² 3,535,774  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 30,000 30,000
Carrying Value $ 29,865 29,785
Property size, number of units/keys | unit 363  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel Portfolio - Rochester, MN [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 24,025 24,182
Carrying Value $ 24,025 24,182
Property size, number of units/keys | key 1,222  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Burbank, CA [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 20,000 20,000
Carrying Value $ 20,000 20,000
Property size, number of units/keys | key 488  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Phoenix, AZ [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 25,000 25,000
Carrying Value $ 25,000 25,000
Property size, number of units/keys | key 744  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Washington D.C. [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 20,000 20,000
Carrying Value $ 19,958 19,934
Property size, number of units/keys | key 581  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel, New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 50,000 50,000
Carrying Value $ 49,684 49,522
Property size, number of units/keys | key 468  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 22,000 22,000
Carrying Value $ 21,926 21,895
Property size, number of units/keys | unit 621  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida (2) [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 15,500 15,500
Carrying Value $ 15,448 15,426
Property size, number of units/keys | unit 621  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily, New York, New York [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 55,000 55,000
Carrying Value $ 54,661 54,558
Property size, area (in square feet) | ft² 185,000  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Michigan [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 8,721 8,753
Carrying Value $ 8,721 8,753
Property size, area (in square feet) | ft² 506,598  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Complex - Missouri [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 9,491 9,566
Carrying Value $ 9,491 9,566
Property size, area (in square feet) | ft² 845,241  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Condo - NY, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 14,000 14,000
Carrying Value $ 13,651 13,631
Property size, area (in square feet) | ft² 436,598  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Warehouse [Member] | Warehouse Portfolio - Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 32,000 32,000
Carrying Value $ 32,000 32,000
Property size, area (in square feet) | ft² 2,767,047  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Healthcare [Member] | Healthcare Portfolio Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 39,223 39,223
Carrying Value $ 39,223 39,223
Property size, number of beds | key 18,403  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Ski Resort [Member] | Ski Resort - Montana [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 15,000 15,000
Carrying Value $ 14,893 14,878
Property size, number of units/keys | key 632  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Senior Housing Facility [Member] | Senior Housing - United Kingdom [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 71,661 79,735
Carrying Value $ 71,661 79,735
Property size, number of beds | bed 2,128  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Destination Resort [Member] | Destination Resort - Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 75,000 75,000
Carrying Value $ 72,127 71,362
Property size, number of units/keys | key 5,243  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Development [Member] | Condo Development - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 44,908 34,184
Carrying Value $ 44,440 33,567
Property size, number of units/keys | unit 60  
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Development [Member] | Condo Pre-development, United Kingdom [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 73,211 81,048
Carrying Value $ 73,211 81,048
Property size, number of units/keys | unit 41  
Subordinate loans [Member]    
Mortgage Loans on Real Estate [Line Items]    
Current Principal Balance $ 934,423 939,006
Carrying Value $ 923,159 $ 931,351