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v2.4.1.9

Principles of Consolidation - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary) | 39 Months Ended
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Mar. 31, 2015 Entity
Variable Interest Entity, Not Primary Beneficiary |
Variable Interest Entity [Line Items] |
Number of securitization entities to which asset transferred | 23 rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

X
- Definition Number of Securitization Entities to which Asset Transferred + References No definition available. + Details
Name: | rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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