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Real Estate Securities - Activity of Credit Component of Other-than-Temporary Impairments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance at beginning of period $ 33,849 $ 37,149 $ 50,852
Initial credit impairments 246 261 137
Subsequent credit impairments 0 70 0
Securities sold, or expected to sell (4,567) (922) (5,811)
Securities with no outstanding principal at period end (1,251) (2,709) (8,029)
Balance at End of Period $ 28,277 $ 33,849 $ 37,149