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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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Credit Reserve    
Beginning balance $ 61,700 $ 70,067
Amortization of net discount 0 0
Realized credit losses (1,706) (7,420)
Acquisitions 0 858
Sales, calls, other (1,632) (1,632)
Impairments 0 0
Transfers to (release of) credit reserves, net (3,021) (6,532)
Ending Balance 55,341 55,341
Unamortized Discount Net    
Beginning balance 273,119 296,342
Amortization of net discount (9,115) (28,277)
Realized credit losses 0 0
Acquisitions 0 5,705
Sales, calls, other (5,522) (18,799)
Impairments 226 226
Transfers to (release of) credit reserves, net 3,021 6,532
Ending Balance $ 261,729 $ 261,729