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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 |

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