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Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Stated maturities | 2018 |  |
Asset-backed Securities |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount |  | (12,373)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember | (17,389)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember
Total ABS Issued |  | 1,545,119 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember | 1,942,962 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities | Certificates With Principal Value |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 1,555,413 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember | 1,956,951 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember
Asset-backed Securities | Interest Only Certificates |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 2,079 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember | 3,400 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember
Asset-backed Securities | Sequoia |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized discount |  | (12,373)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | (17,389)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Total ABS Issued |  | 1,416,762 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,694,335 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Number of series |  | 24 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 24 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Asset-backed Securities | Sequoia | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rates, by series |  | 0.36%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 0.24%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Stated maturities |  | 2014 | 2014
Asset-backed Securities | Sequoia | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rates, by series |  | 4.27%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 4.23%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Stated maturities |  | 2047 | 2047
Asset-backed Securities | Sequoia | Certificates With Principal Value |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 1,427,056 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,708,324 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Asset-backed Securities | Sequoia | Interest Only Certificates |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 2,079 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 3,400 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_InterestOnlyCertificatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Asset-backed Securities | Residential Resecuritization |  |  |
Debt Instrument [Line Items] |  |  |
Total ABS Issued |  | 45,044 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 94,934 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Weighted average interest rates, by series |  | 2.16%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 2.21%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Stated maturities |  | 2046 | 2046
Number of series |  | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Asset-backed Securities | Residential Resecuritization | Certificates With Principal Value |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 45,044 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember | 94,934 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Asset-backed Securities | Commercial Securitization |  |  |
Debt Instrument [Line Items] |  |  |
Total ABS Issued |  | 83,313 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 153,693 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Weighted average interest rates, by series |  | 5.62%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 5.62%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Stated maturities |  | 2018 | 2018
Number of series |  | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 1 rwt_NumberOfSeries / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Asset-backed Securities | Commercial Securitization | Certificates With Principal Value |  |  |
Debt Instrument [Line Items] |  |  |
Principal value |  | 83,313 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember | 153,693 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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