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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance at beginning of period [1] $ 139,293    
Additions 64,725 $ 48,000 $ 44,063
Balance at End of Period [1] 191,976 139,293  
Mortgage Servicing Rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance at beginning of period 139,293 64,824 5,315
Additions 95,281 95,550 47,514
Sales 18,206 0 0
Changes in assumptions (5,453) (12,467) 15,719
Other changes (18,939) (8,614) (3,724)
Balance at End of Period $ 191,976 $ 139,293 $ 64,824
[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 December 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,195,574 and $1,900,208, respectively. At December 31, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,050,861 and $1,546,490, respectively. See Note 4 for further discussion.