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Subordinate Loans - Loans Portfolio (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) ft² unit key bed	Dec. 31, 2015 USD ($)
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 11,374	$ 26,328
Carrying Value	6,284	26,095
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		6,386
Carrying Value		6,415
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		12,347
Carrying Value		12,222
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	6,374	2,595
Carrying Value	$ 6,284	2,458
Property size, number of units/keys | key	317
Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily - Williston, ND [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 5,000	5,000
Carrying Value	$ 0	5,000
Property size, number of units/keys | unit	366
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 880,898	912,678
Carrying Value	875,930	905,256
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	57,750	52,418
Carrying Value	$ 57,459	51,941
Property size, number of units/keys | unit	223
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY - January 2016 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 37,646
Carrying Value	$ 36,991
Property size, number of units/keys | unit	139
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - North Carolina [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 6,525	6,525
Carrying Value	$ 6,525	6,525
Property size, area (in square feet) | ft²	170,897
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		19,500
Carrying Value		19,377
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - London, England [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		50,676
Carrying Value		50,676
Property size, area (in square feet) | ft²	210,000
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 96,856	88,368
Carrying Value	$ 96,758	87,818
Property size, number of units/keys | unit	363
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 45,000	45,000
Carrying Value	$ 45,076	44,854
Property size, area (in square feet) | ft²	3,535,774
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 30,000	30,000
Carrying Value	$ 29,896	29,785
Property size, number of units/keys | unit	363
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel Portfolio - Rochester, MN [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 23,947	24,182
Carrying Value	$ 23,947	24,182
Property size, number of units/keys | key	1,222
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Burbank, CA [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 20,000	20,000
Carrying Value	$ 20,000	20,000
Property size, number of units/keys | key	488
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Phoenix, AZ [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 25,000	25,000
Carrying Value	$ 25,000	25,000
Property size, number of units/keys | key	744
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel - Washington D.C. [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 20,000	20,000
Carrying Value	$ 19,968	19,934
Property size, number of units/keys | key	581
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member] | Hotel, New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 50,000	50,000
Carrying Value	$ 49,956	49,522
Property size, number of units/keys | key	468
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 22,000	22,000
Carrying Value	$ 21,947	21,895
Property size, number of units/keys | unit	621
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida (2) [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 15,500	15,500
Carrying Value	$ 15,462	15,426
Property size, number of units/keys | unit	621
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member] | Multifamily, New York, New York [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 55,000	55,000
Carrying Value	$ 54,696	54,558
Property size, area (in square feet) | ft²	185,000
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Michigan [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		8,753
Carrying Value		8,753
Property size, area (in square feet) | ft²	506,598
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Complex - Missouri [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 9,454	9,566
Carrying Value	$ 9,454	9,566
Property size, area (in square feet) | ft²	845,241
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Office [Member] | Office Condo - NY, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 14,000	14,000
Carrying Value	$ 13,665	13,631
Property size, area (in square feet) | ft²	436,598
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Warehouse [Member] | Warehouse Portfolio - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 32,000	32,000
Carrying Value	$ 32,000	32,000
Property size, area (in square feet) | ft²	2,767,047
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Healthcare [Member] | Healthcare Portfolio Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 38,858	39,223
Carrying Value	$ 38,858	39,223
Property size, number of beds | key	18,403
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Ski Resort [Member] | Ski Resort - Montana [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 15,000	15,000
Carrying Value	$ 14,758	14,878
Property size, number of units/keys | key	632
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Senior Housing Facility [Member] | Senior Housing - United Kingdom [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 69,400	79,735
Carrying Value	$ 69,400	79,735
Property size, number of beds | bed	2,128
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Destination Resort [Member] | Destination Resort - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 75,000	75,000
Carrying Value	$ 72,502	71,362
Property size, number of units/keys | key	5,243
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Development [Member] | Condo Development - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 50,616	34,184
Carrying Value	$ 50,266	33,567
Property size, number of units/keys | unit	60
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Development [Member] | Condo Pre-development, United Kingdom [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 71,346	81,048
Carrying Value	$ 71,346	81,048
Property size, number of units/keys | unit	41
Subordinate Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 892,272	939,006
Carrying Value	$ 882,214	$ 931,351

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

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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