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Principles of Consolidation - Summary of Redwood's Interest in Third-Party Variable Interest Entity's (Detail) (Real Estate Securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Variable Interest Entity [Line Items]
Assets	$ 824,690us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Senior Securities
Variable Interest Entity [Line Items]
Assets	480,200us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Re-REMIC
Variable Interest Entity [Line Items]
Assets	169,240us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember
Subordinate Securities
Variable Interest Entity [Line Items]
Assets	$ 175,250us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

X

- Details

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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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Balance Type:	debit
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