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Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 1,900,208 rwt_CollateralForAssetBackedSecuritiesIssued | $ 2,292,378 rwt_CollateralForAssetBackedSecuritiesIssued
Residential Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,474,386 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember | 1,762,167 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember
Commercial Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 194,991 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember | 257,741 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember
Real Estate Securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 221,676 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember | 263,204 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember
Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 327 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember | 289 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,347 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember | 5,316 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember
REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,481 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember | 3,661 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember
Sequoia |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,481,303 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,768,694 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,474,386 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,762,167 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 147 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 152 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 2,359 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 2,714 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 4,411 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 3,661 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Residential Resecuritization |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 222,196 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 263,831 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Real Estate Securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 221,676 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 263,204 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 43 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Residential Resecuritization | Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 477 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 627 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Commercial Securitization |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 196,709 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 259,853 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Commercial Loans |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 194,991 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 257,741 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Restricted Cash |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 137 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 137 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Accrued Interest Receivable |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | 1,511 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 1,975 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | REO |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Collateral for ABS Issued | $ 70 rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |

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