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Real Estate Securities - Components of Carrying Value of Residential Available for Sale Securities in Unrealized Loss Position (Detail) - Residential - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months Amortized Cost $ 87,718 $ 126,681
Less Than 12 Consecutive Months Gross Unrealized Losses (1,972) (1,374)
Less Than 12 Consecutive Months Fair Value 85,746 125,307
12 Consecutive Months or Longer Amortized Cost 77,539 70,676
12 Consecutive Months or Longer Gross Unrealized Losses (3,035) (1,422)
12 Consecutive Months or Longer Fair Value $ 74,504 $ 69,254