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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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