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Subordinate Loans - Loans Portfolio (Footnotes) (Detail) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 29, 2016 USD ($)	Mar. 31, 2016 USD ($) option	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) option
Mortgage Loans on Real Estate [Line Items]
Proceeds from collection of mortgages | $		$ 14,824	$ 727
Subordinate loans [Member] | Multifamily, Mixed Use, Senior Housing and Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement | option		2
Subordinate loans [Member] | Healthcare Portfolio, Multifamily Portfolio and Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement | option		3
Subordinate loans [Member] | Mixed Use, Senior Housing, Hotel, Condo Conversion and Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Number of options to extend loan agreement | option				2
Subordinate loans [Member] | Healthcare and Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Number of options to extend loan agreement | option				3
Subordinate loans [Member] | Multifamily Portfolio [Member]
Mortgage Loans on Real Estate [Line Items]
Proceeds from collection of mortgages | $	$ 19,500
Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel and Condo-Pre-development [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		3 months
Hotel - New York, NY [Member] | Subordinate loans [Member] | Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Number of options to extend loan agreement | option				2
Unfunded loan commitments | $				$ 12,478
Hotel - New York, NY [Member] | Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement | option		2
Unfunded loan commitments | $		$ 9,907
Condo Development - New York, NY [Member] | Subordinate loans [Member] | Condo Development [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Unfunded loan commitments | $				$ 41,160
Condo Development - New York, NY [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Development [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Unfunded loan commitments | $		$ 36,576
Mixed Use - New York, NY [Member] | Subordinate loans [Member] | Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Number of options to extend loan agreement | option				2
Unfunded loan commitments | $				$ 785
Mixed Use - New York, NY [Member] | Subordinate loans [Member] | Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Mixed Use - New York, NY [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Destination Resort - Various [Member] | Subordinate loans [Member] | Destination Resort [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				1 year
Destination Resort - Various [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Destination Resort [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement | option		4		4
Multifamily, New York, New York [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Multifamily Portfolio [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		6 months		6 months
Hotel, New York, NY [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term				3 months
Condo Conversion, New York, NY - January 2016 [Member] | Subordinate Mortgage Loans to Third Party Commercial Mortgage Loans [Member] | Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Unfunded loan commitments | $		$ 53,367

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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