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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]    
Balance at beginning of period [1] $ 191,976  
Additions 3,463 $ 15,675
Changes in fair value due to:    
Balance at End of Period 126,620  
Mortgage servicing rights    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Balance at beginning of period 191,976 139,293
Additions 8,807 18,754
Sales (29,559) (18,206)
Changes in fair value due to:    
Changes in assumptions (38,328) (14,036)
Other changes (6,276) (5,481)
Balance at End of Period $ 126,620 $ 120,324
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At March 31, 2016 and December 31, 2015, assets of consolidated VIEs totaled $1,102,195 and $1,195,574, respectively. At March 31, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $959,464 and $1,050,861, respectively. See Note 4 for further discussion.