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Summary of Redwood's Interest in Third-Party Variable Interest Entity's (Detail) (Real Estate Securities, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Variable Interest Entity [Line Items]
Assets	$ 824,438us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Senior Securities
Variable Interest Entity [Line Items]
Assets	495,508us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Re-REMIC
Variable Interest Entity [Line Items]
Assets	168,347us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember
Subordinate Securities
Variable Interest Entity [Line Items]
Assets	$ 160,583us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant