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Asset-Backed Securities Issued - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Description of interest rate Substantially all ABS issued pay variable rates of interest, which are indexed to one-, three-, or six-month LIBOR.    
ABS issued [1],[2] $ 1,049,957,000 $ 1,545,119,000  
Asset-backed Securities      
Debt Instrument [Line Items]      
ABS issued 1,049,957,000 1,545,119,000  
Amortization of deferred ABS issuance costs 1,000,000 2,000,000 $ 3,000,000
Asset-backed Securities | Contractual maturities of over five years      
Debt Instrument [Line Items]      
ABS issued $ 1,040,000,000    
Contractual maturities of ABS (in years) 5 years    
Asset-backed Securities | Certificates With Principal Value      
Debt Instrument [Line Items]      
Principal value $ 1,161,922,000 $ 1,555,413,000  
Asset-backed Securities | Certificates With Principal Value | Contractual maturities of over five years      
Debt Instrument [Line Items]      
Principal value $ 1,150,000,000.00    
[1] On January 1, 2015, we adopted ASU 2014-13 and began to account for residential loans held-for-investment and asset backed securities issued at consolidated Sequoia entities (which are VIEs) at fair value. At December 31, 2014, amounts presented in residential loans held-for-investment for these assets included $1,474,386 at historical cost. See Note 3 for further discussion.
[2] 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.