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Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Servicing Assets at Fair Value [Line Items] |  |  |
MSR Fair Value | $ 139,293 us-gaap_ServicingAssetAtFairValueAmount | $ 64,824 us-gaap_ServicingAssetAtFairValueAmount | $ 5,315 us-gaap_ServicingAssetAtFairValueAmount
Associated Principal | 13,667,930 us-gaap_ServicingAsset | 5,791,758 us-gaap_ServicingAsset |
Conforming Loan |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
MSR Fair Value | 81,301 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember | 3,331 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |
Associated Principal | 7,705,146 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember | 308,258 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |
Jumbo Loan |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
MSR Fair Value | 57,992 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember | 61,493 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |
Associated Principal | $ 5,962,784 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember | $ 5,483,500 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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