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Commercial Mortgage Loan Portfolio (Detail) - Commercial Mortgage Portfolio Segment [Member] $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) a ft² unit property key | Dec. 31, 2015 USD ($) a ft² unit property key
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 1,443,531 | $ 999,583
Carrying Value | $ 1,426,990 | $ 994,301
Condo Conversion [Member] | Condominium - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
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] |  |
Current Principal Balance |  | $ 67,300
Carrying Value |  | $ 67,038
Property size, area (in square feet and acres) | ft² | 86,000 | 86,000
Condo Conversion [Member] | Condo Conversion - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 40,600 |
Carrying Value | $ 40,295 |
Property size, area (in square feet and acres) | ft² | 133,600 |
Condo Construction [Member] | Condominium - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 3,175 | $ 24,114
Carrying Value | 3,198 | 24,289
Condo Construction [Member] | Condominium Bethesda, MD [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 49,893 | 65,125
Carrying Value | $ 50,337 | $ 65,087
Property size, number of units/keys | unit | 50 | 50
Condo Construction [Member] | Condo Construction Bethesda, MD [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 51,419 | $ 50,000
Carrying Value | $ 51,737 | $ 49,960
Property size, number of units/keys | unit | 40 | 40
Vacation Home Portfolio [Member] | Vacation Home Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 91,015 | $ 94,147
Carrying Value | $ 90,270 | $ 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] |  |
Current Principal Balance | $ 59,500 | $ 50,000
Carrying Value | $ 59,167 | $ 49,595
Number of properties | property | 24 | 24
Hotel [Member] | Hotel - Philadelphia, PA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 34,000 | $ 34,000
Carrying Value | $ 33,980 | $ 33,994
Property size, number of units/keys | key | 301 | 301
Hotel [Member] | Hotel - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 101,764 | $ 98,373
Carrying Value | $ 101,463 | $ 97,381
Property size, number of units/keys | key | 317 | 317
Hotel [Member] | Hotel, U.S. Virgin Islands [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 42,000 | $ 42,000
Carrying Value | $ 41,747 | $ 41,600
Property size, number of units/keys | key | 180 | 180
Hotel [Member] | Hotel, New York, NY, August 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 78,140 |
Carrying Value | $ 77,141 |
Property size, number of units/keys | key | 612 |
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 34,500 | $ 34,500
Carrying Value | $ 34,984 | $ 34,886
Property size, number of units/keys | unit | 63 | 63
Multifamily Conversion [Member] | Multifamily - Williston, ND [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 49,706 | $ 49,691
Carrying Value | $ 39,715 | $ 49,665
Property size, number of units/keys | unit | 366 | 366
Mixed Use [Member] | Mixed Use - Cincinnati, OH [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 165,000 | $ 165,000
Carrying Value | $ 163,517 | $ 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] |  |
Current Principal Balance | $ 85,770 | $ 85,770
Carrying Value | $ 86,051 | $ 85,658
Property size, area (in square feet and acres) | ft² | 330,000 | 330,000
Mixed Use [Member] | Mixed Use - New York, NY, June 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 45,069 |
Carrying Value | $ 44,717 |
Property size, area (in square feet and acres) | ft² | 91,580 |
Mixed Use [Member] | Mixed Use, Chicago, IL [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 128,000 |
Carrying Value | $ 126,721 |
Property size, area (in square feet and acres) | ft² | 737,400 |
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 45,000 | $ 45,000
Carrying Value | $ 45,308 | $ 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] |  |
Current Principal Balance |  | $ 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] |  |
Current Principal Balance | $ 220,000 |
Carrying Value | $ 218,173 |
Property size, area (in square feet and acres) | ft² | 113,000 |
Retail [Member] | Retail - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 23,000 | $ 1,653
Carrying Value | $ 22,982 | $ 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] |  |
Current Principal Balance | $ 5,910 | $ 5,910
Carrying Value | $ 5,904 | $ 5,858
Property size, area (in square feet and acres) | ft² | 5,500 | 5,500
Retail [Member] | Retail - Brooklyn, NY, March 2017 - 2 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 7,500 |
Carrying Value | $ 7,441 |
Property size, area (in square feet and acres) | ft² | 6,500 |
Office [Member] | Office, Richmond, VA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 54,000 | $ 54,000
Carrying Value | $ 53,750 | $ 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] |  |
Current Principal Balance | $ 28,570 |
Carrying Value | $ 28,392 |
Property size, area (in square feet and acres) | ft² | 114,000 |

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