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Commercial Mortgage Loan Portfolio (Detail) - Commercial mortgage loans [Member]
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
a
ft²
unit
property
room
Room
Dec. 31, 2015
USD ($)
a
ft²
unit
property
room
Room
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 1,232,287 $ 1,037,940
Current Face Amount 1,180,643 999,583
Carrying Value $ 1,173,185 $ 994,301
Coupon rate of loan 7.08%
Condo Conversion [Member] | Condo Conversion - NY, NY August 2013 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 33,000 $ 33,000
Current Face Amount 24,114 24,114
Carrying Value $ 24,319 $ 24,289
Property Size, Area (in square feet and acres) | ft² 40,000 40,000
Condo Conversion [Member] | Condo Conversion New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 67,300 $ 67,300
Current Face Amount 67,300 67,300
Carrying Value $ 67,026 $ 67,038
Property Size, Area (in square feet and acres) | ft² 86,000 86,000
Condo Construction [Member] | Condominium Bethesda, MD [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 80,000 $ 80,000
Current Face Amount 53,260 65,125
Carrying Value $ 53,388 $ 65,087
Property Size, Number of Units/Rooms | unit 50 50
Condo Construction [Member] | Condo Construction Bethesda, MD [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 50,000 $ 50,000
Current Face Amount 50,000 50,000
Carrying Value $ 50,158 $ 49,960
Property Size, Number of Units/Rooms | unit 40 40
Vacation Home Portfolio [Member] | Vacation Home Portfolio - Various [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 101,000 $ 101,000
Current Face Amount 92,243 94,147
Carrying Value $ 91,394 $ 93,277
Number of properties | property 229 229
Vacation Home Portfolio [Member] | Vacation Home Portfolio - Various, United States [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 50,000 $ 50,000
Current Face Amount 50,000 50,000
Carrying Value $ 49,618 $ 49,595
Number of properties | property 24 24
Hotel [Member] | Hotel - Philadelphia, PA [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 34,000 $ 34,000
Current Face Amount 34,000 34,000
Carrying Value $ 33,987 $ 33,994
Property Size, Number of Units/Rooms | room 301 301
Hotel [Member] | Hotel - New York, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 97,807 $ 97,807
Current Face Amount 98,854 98,373
Carrying Value $ 98,119 $ 97,381
Property Size, Number of Units/Rooms | room 317 317
Hotel [Member] | Hotel, U.S. Virgin Islands [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 42,000 $ 42,000
Current Face Amount 42,000 42,000
Carrying Value $ 41,656 $ 41,600
Property Size, Number of Units/Rooms | Room 180 180
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 34,500 $ 34,500
Current Face Amount 34,500 34,500
Carrying Value $ 34,918 $ 34,886
Property Size, Number of Units/Rooms | unit 63 63
Multifamily Conversion [Member] | Multifamily - Williston, ND [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 58,000 $ 58,000
Current Face Amount 49,692 49,691
Carrying Value $ 49,688 $ 49,665
Property Size, Number of Units/Rooms | unit 366 366
Mixed Use [Member] | Mixed Use - Cincinnati, OH [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 165,000 $ 165,000
Current Face Amount 165,000 165,000
Carrying Value $ 162,422 $ 163,173
Property Size, Area (in square feet and acres) | a 65 65
Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 85,770 $ 85,770
Current Face Amount 85,770 85,770
Carrying Value $ 85,821 $ 85,658
Property Size, Area (in square feet and acres) | ft² 330,000 330,000
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 45,000 $ 45,000
Current Face Amount 45,000 45,000
Carrying Value $ 45,071 $ 44,925
Property Size, Area (in square feet and acres) | ft² 63,300 63,300
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL (2) [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount   $ 33,000
Current Face Amount   33,000
Carrying Value   $ 32,804
Property Size, Area (in square feet and acres) | ft²   16,600
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL January 2016 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 177,500  
Current Face Amount 177,500  
Carrying Value $ 175,043  
Property Size, Area (in square feet and acres) | ft² 113,000  
Retail [Member] | Retail - Brooklyn, NY [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 23,000 $ 1,653
Current Face Amount 23,000 1,653
Carrying Value $ 22,906 $ 1,636
Property Size, Area (in square feet and acres) | ft² 10,500 10,500
Retail [Member] | Retail, Brooklyn, NY, November 2015 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 5,910 $ 5,910
Current Face Amount 5,910 5,910
Carrying Value $ 5,878 $ 5,858
Property Size, Area (in square feet and acres) | ft² 5,500 5,500
Office [Member] | Office, Richmond, VA [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 54,000 $ 54,000
Current Face Amount 54,000 54,000
Carrying Value $ 53,571 $ 53,475
Property Size, Area (in square feet and acres) | ft² 262,000 262,000
Office [Member] | Office - Boston, MA [Member]    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 28,500  
Current Face Amount 28,500  
Carrying Value $ 28,202  
Property Size, Area (in square feet and acres) | ft² 114,000