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Subordinate Loan Portfolio (Parenthetical) (Detail) (Subordinate Loans [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Hotel - New York [Member] | Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term 1 year 1 year
Condo Conversion - NY, NY [Member] | Condo Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term 1 year 1 year
Number of Options to Extend Loan Agreement 2 2
Unfunded Loan Commitments   $ 34,650
Multifamily Conversion - NY, NY June 2014 [Member] | Multifamily Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term 3 months  
Condo Conversion - NY, NY September 2015 [Member] | Condo Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term 1 year  
Unfunded Loan Commitments $ 29,106  
Hotel Portfolio - New York [Member] | Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term   1 year
Number of Options to Extend Loan Agreement   3
Retail Center - Virginia [Member] | Retail [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term   1 year
Number of Options to Extend Loan Agreement   2
Hotel - New York March 2014 [Member] | Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term   1 year
Number of Options to Extend Loan Agreement   2
Hotel Portfolio - Various [Member] | Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Debt Instrument, Option to Extend Loan Agreement, Term   1 year