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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period [1]     $ 191,976  
Additions     5,688 $ 36,834
Changes in fair value due to:        
Balance at End of Period [1] $ 110,046   110,046  
Mortgage servicing rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period 126,620 $ 120,324 191,976 139,293
Additions 10,691 32,463 19,498 51,217
Sales 0 0 (29,559) (18,206)
Changes in fair value due to:        
Changes in assumptions (21,480) 19,168 (59,808) 5,132
Other changes (5,785) (3,493) (12,061) (8,974)
Balance at End of Period $ 110,046 $ 168,462 $ 110,046 $ 168,462
[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 June 30, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.