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Subordinate Loans - Loans Portfolio (Footnotes) (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
option
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
option
Mortgage Loans on Real Estate [Line Items]          
Provision for loan losses $ 15,000,000 $ 0 $ 15,000,000 $ 0  
Subordinate loans [Member]          
Mortgage Loans on Real Estate [Line Items]          
Provision for loan losses 5,000,000   5,000,000    
Loans and Leases Receivable, Allowance 5,000,000   $ 5,000,000   $ 0
Subordinate loans [Member] | Multifamily, Mixed Use, Senior Housing and Condo Conversion [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option     2    
Option to extend loan agreement, term     1 year    
Subordinate loans [Member] | Healthcare Portfolio, Multifamily Portfolio and Mixed Use [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option     3    
Option to extend loan agreement, term     1 year    
Subordinate loans [Member] | Mixed Use, Senior Housing, Hotel, Condo Conversion and Multifamily [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option         2
Option to extend loan agreement, term         1 year
Subordinate loans [Member] | Healthcare and Multifamily [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option         3
Option to extend loan agreement, term         1 year
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]          
Number of options to extend loan agreement | option         2
Option to extend loan agreement, term         1 year
Unfunded loan commitments         $ 12,478,000
Hotel - New York, NY [Member] | Subordinate Mortgage Loans to Company Commercial Mortgage Loans [Member] | Hotel [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option     2    
Option to extend loan agreement, term     1 year    
Unfunded loan commitments 9,348,000   $ 9,348,000    
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         $ 41,160,000
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 31,035,000   $ 31,035,000    
Mixed Use - New York, NY [Member] | Subordinate loans [Member] | Mixed Use [Member]          
Mortgage Loans on Real Estate [Line Items]          
Number of options to extend loan agreement | option         2
Option to extend loan agreement, term         1 year
Unfunded loan commitments         $ 785,000
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]          
Number of options to extend loan agreement | option     4   4
Option to extend loan agreement, term     1 year    
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 $ 45,442,000   $ 45,442,000