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Summary of Accrued Interest Payable on Asset-Backed Securities Issued (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Accrued interest payable | $ 8,502 us-gaap_InterestPayableCurrentAndNoncurrent | $ 6,366 us-gaap_InterestPayableCurrentAndNoncurrent
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary |  |
Debt Instrument [Line Items] |  |
Accrued interest payable | 1,371 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,949 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Sequoia |  |
Debt Instrument [Line Items] |  |
Accrued interest payable | 976 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,218 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Residential Resecuritization |  |
Debt Instrument [Line Items] |  |
Accrued interest payable | 5 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 11 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Commercial Securitization |  |
Debt Instrument [Line Items] |  |
Accrued interest payable | $ 390 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | $ 720 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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- Definition Amount of interest payable on debt, including, but not limited to, trade payables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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