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Commercial Mortgage Loan Portfolio (Detail) - Commercial mortgage loans [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) a ft² unit property room	Dec. 31, 2014 USD ($) a ft² unit property room
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 928,130	$ 467,300
Current Face Amount	911,385	465,574
Carrying Value	$ 905,681	$ 458,520
Coupon rate of loan	7.02%	6.84%
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	24,131	33,846
Carrying Value	$ 24,252	$ 33,961
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	$ 67,078	$ 64,714
Property Size, Area (in square feet and acres) | ft²	86,000	86,000
Condo Construction [Member] | Condo Construction Potomac, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 80,000	$ 28,000
Current Face Amount	80,000	28,000
Carrying Value	$ 79,739	$ 27,520
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	$ 33,000	$ 20,000
Current Face Amount	33,000	20,000
Carrying Value	$ 32,900	$ 19,616
Property Size, Number of Units/Rooms | unit	40	40
Hotel [Member] | Hotel - Silver Spring, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount		$ 26,000
Current Face Amount		24,590
Carrying Value		$ 24,557
Property Size, Number of Units/Rooms | room		263
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	$ 33,960	$ 33,842
Property Size, Number of Units/Rooms | room	301	301
Hotel [Member] | Hotel Portfolio - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 45,400
Current Face Amount	45,400
Carrying Value	$ 45,290
Property Size, Number of Units/Rooms | room	2,690
Hotel [Member] | Hotel - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 97,807
Current Face Amount	97,807
Carrying Value	$ 96,431
Property Size, Number of Units/Rooms | room	317
Mixed Use [Member] | Mixed Use - Cincinnati, OH [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 128,700	$ 20,000
Current Face Amount	128,700	20,000
Carrying Value	$ 127,074	$ 18,309
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
Current Face Amount	85,770
Carrying Value	$ 85,414
Property Size, Area (in square feet and acres) | ft²	330,000
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 34,500	$ 30,000
Current Face Amount	34,500	30,000
Carrying Value	$ 34,818	$ 30,110
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	55,140	57,792
Carrying Value	$ 54,979	$ 57,297
Property Size, Number of Units/Rooms | unit	366	366
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	95,984	100,046
Carrying Value	$ 95,086	$ 99,086
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	$ 49,572	$ 49,508
Number of properties | property	24	24
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 45,000
Current Face Amount	45,000
Carrying Value	$ 44,740
Property Size, Area (in square feet and acres) | ft²	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	$ 32,719
Property Size, Area (in square feet and acres) | ft²	16,600
Retail [Member] | Retail - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 1,653
Current Face Amount	1,653
Carrying Value	$ 1,629
Property Size, Area (in square feet and acres) | ft²	10,500

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