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Asset-Backed Securities Issued - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
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 principal $ 1,353,021,000us-gaap_SecuredDebt [1],[2]   $ 1,545,119,000us-gaap_SecuredDebt [1],[2]
Asset-backed Securities      
Debt Instrument [Line Items]      
ABS issued principal 1,353,021,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember		   1,545,119,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
Amortization of deferred ABS issuance costs, less than 1,000,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember		 1,000,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember		  
Asset-backed Securities | Contractual maturities of over five years      
Debt Instrument [Line Items]      
ABS issued principal 1,350,000,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rwt_MaturityOverFiveYearsMember		    
Contractual maturities of ABS (in years) 5 years    
Asset-backed Securities | Maturity Less Than One Year      
Debt Instrument [Line Items]      
ABS issued principal 7,000,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rwt_MatureInLessThanOneYearMember		    
Contractual maturities of ABS, maximum (in years) 1 year    
Asset-backed Securities | Certificates With Principal Value      
Debt Instrument [Line Items]      
Principal value 1,473,602,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember		   1,555,413,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember
Asset-backed Securities | Certificates With Principal Value | Contractual maturities of over five years      
Debt Instrument [Line Items]      
Principal value 1,460,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rwt_MaturityOverFiveYearsMember
/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember		    
Asset-backed Securities | Certificates With Principal Value | Maturity Less Than One Year      
Debt Instrument [Line Items]      
Principal value $ 16,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= rwt_MatureInLessThanOneYearMember
/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember		    
[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 the primary beneficiary (Redwood Trust, Inc.). At March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.
[2] 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.