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Summary of Accrued Interest Payable on Asset-Backed Securities Issued (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Accrued interest payable $ 10,480 $ 6,366
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary
    
Debt Instrument [Line Items]    
Accrued interest payable 1,580 1,949
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Sequoia
    
Debt Instrument [Line Items]    
Accrued interest payable 1,034 1,218
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Residential Resecuritization
    
Debt Instrument [Line Items]    
Accrued interest payable 7 11
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Commercial Securitization
    
Debt Instrument [Line Items]    
Accrued interest payable $ 539 $ 720