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Available for Sale Securities by Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available-for-sale securities $ 1,286,235 $ 1,558,306
Senior Securities
    
Investment Holdings [Line Items]    
Available-for-sale securities 545,036 855,692
Senior Securities | Prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 358,813 662,306
Senior Securities | Non-prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 186,223 193,386
Re-REMIC
    
Investment Holdings [Line Items]    
Available-for-sale securities 176,117 176,376
Subordinate Securities
    
Investment Holdings [Line Items]    
Available-for-sale securities 565,082 526,238
Subordinate Securities | Prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 564,932 526,095
Subordinate Securities | Non-prime
    
Investment Holdings [Line Items]    
Available-for-sale securities $ 150 $ 143