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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
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Variable Interest Entity [Line Items] |
Assets | $ 824,690 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Senior Securities |
Variable Interest Entity [Line Items] |
Assets | 480,200 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Re-REMIC |
Variable Interest Entity [Line Items] |
Assets | 169,240 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember
Subordinate Securities |
Variable Interest Entity [Line Items] |
Assets | $ 175,250 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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