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Mortgage-Backed and Credit Risk Transfer Securities - Impact of MBS and GSE CRT on Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income Loss, Available-for-sale Securities [Roll Forward]    
Unrealized gain (loss) on MBS and GSE CRT at beginning of period $ 162,081 $ 351,774
Unrealized gain (loss) on MBS and GSE CRT 122,619 125,954
Reclassification of unrealized (gain) loss on sale of mortgage-backed and credit risk transfer securities to gain (loss) on investments, net (10,544) (2,934)
Unrealized gain (loss) on MBS and GSE CRT at end of period $ 274,156 $ 474,794