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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) - Residential - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Credit Reserve    
Beginning balance $ 70,067 $ 116,870
Amortization of net discount 0 0
Realized credit losses (8,535) (11,501)
Acquisitions 2,557 3,581
Sales, calls, other (7,296) (2,555)
Impairments 0 565
Transfers to (release of) credit reserves, net (7,924) (36,893)
Ending Balance 48,869 70,067
Unamortized Discount Net    
Beginning balance 296,342 298,469
Amortization of net discount (36,850) (42,835)
Realized credit losses 0 0
Acquisitions 15,791 15,348
Sales, calls, other (46,346) (11,533)
Impairments 246 0
Transfers to (release of) credit reserves, net 7,924 36,893
Ending Balance $ 237,107 $ 296,342