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Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
MSRs recognized	$ 48,000us-gaap_ServicingAssetAtFairValueAdditions	$ 44,063us-gaap_ServicingAssetAtFairValueAdditions	$ 7,329us-gaap_ServicingAssetAtFairValueAdditions
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Principal balance of loans transferred	1,324,419rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember	5,578,298rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
MSRs recognized	8,518us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember	42,921us-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	77,160rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_TradingAccountAssetsMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember	105,320rwt_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	$ 78,218rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember	$ 301,072rwt_SecuritiesRetainedAtFairValueDuringPeriod / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

X

- Definition

Principal Amount Of Loans Securitized During Period

+ References

No definition available.

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- Definition

Securities Retained At Fair Value During Period

+ References

No definition available.

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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

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