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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Variable Interest Entity [Line Items] |  |
MSRs recognized | $ 15,675 us-gaap_ServicingAssetAtFairValueAdditions | $ 2,294 us-gaap_ServicingAssetAtFairValueAdditions
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Principal balance of loans transferred | 338,796 rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 0 rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
MSRs recognized | 1,872 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 0 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | 3,423 rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_TradingAccountAssetsMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 0 rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_TradingAccountAssetsMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | $ 2,859 rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | $ 0 rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

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- Definition Principal Amount Of Loans Securitized During Period + References No definition available. + Details
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- Definition Securities Retained At Fair Value During Period + References No definition available. + Details
Name: | rwt_SecuritiesRetainedAtFairValueDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Period Type: |