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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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