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Asset-Backed Securities Issued - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Description of interest rate | Substantially all ABS issued pay variable rates of interest, which are indexed to one-, three-, or six-month LIBOR. |  |
Asset-backed Securities |  |  |
Debt Instrument [Line Items] |  |  |
ABS issued | $ 1,545,119,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember | $ 1,942,962,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember |
Amortization of deferred ABS issuance costs | 2,000,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember | 3,000,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember | 3,000,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities | Contractual maturities of over five years |  |  |
Debt Instrument [Line Items] |  |  |
ABS issued | 1,530,000,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentSecondaryCategorizationAxis = rwt_MaturityOverFiveYearsMember |  |
Contractual maturities of ABS (in years) | 5 years |  |
Asset-backed Securities | Contractual maturities of one to five years |  |  |
Debt Instrument [Line Items] |  |  |
ABS issued | 16,000,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentSecondaryCategorizationAxis = rwt_MaturityOneToFiveYearsMember |  |
Contractual maturities of ABS, minimum (in years) | 1 year |  |
Contractual maturities of ABS, maximum (in years) | 5 years |  |
Asset-backed Securities | Certificates With Principal Value |  |  |
Debt Instrument [Line Items] |  |  |
Principal value | 1,555,413,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember | 1,956,951,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember |
Asset-backed Securities | Certificates With Principal Value | Contractual maturities of over five years |  |  |
Debt Instrument [Line Items] |  |  |
Principal value | 1,540,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentSecondaryCategorizationAxis = rwt_MaturityOverFiveYearsMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember |  |
Asset-backed Securities | Certificates With Principal Value | Contractual maturities of one to five years |  |  |
Debt Instrument [Line Items] |  |  |
Principal value | $ 16,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_InvestmentSecondaryCategorizationAxis = rwt_MaturityOneToFiveYearsMember / us-gaap_InvestmentTypeAxis = rwt_CertificatesWithPrincipalValueMember |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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