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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period [1]     $ 139,293  
Additions     52,297 $ 30,962
Changes in fair value due to:        
Balance at End of Period $ 162,726   162,726  
Mortgage servicing rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Balance at beginning of period 168,462 $ 71,225 139,293 64,824
Additions 22,760 61,606 73,976 76,272
Sales 0 0 (18,206) 0
Changes in fair value due to:        
Changes in assumptions (23,786) 4,323 (18,653) (318)
Other changes (4,710) (2,002) (13,684) (5,626)
Balance at End of Period $ 162,726 $ 135,152 $ 162,726 $ 135,152
[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 September 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.