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Available for Sale Securities by Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available-for-sale securities $ 1,671,786 $ 1,558,306
Senior Securities
    
Investment Holdings [Line Items]    
Available-for-sale securities 903,966 855,692
Senior Securities | Prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 711,710 662,306
Senior Securities | Non-prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 192,256 193,386
Re-REMIC
    
Investment Holdings [Line Items]    
Available-for-sale securities 192,596 176,376
Subordinate Securities
    
Investment Holdings [Line Items]    
Available-for-sale securities 575,224 526,238
Subordinate Securities | Prime
    
Investment Holdings [Line Items]    
Available-for-sale securities 575,067 526,095
Subordinate Securities | Non-prime
    
Investment Holdings [Line Items]    
Available-for-sale securities $ 157 $ 143