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Mortgage Servicing Rights - Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Servicing Assets at Fair Value [Line Items] |  |  |  |
MSR Fair Value | $ 120,324 us-gaap_ServicingAssetAtFairValueAmount | [1] | $ 139,293 us-gaap_ServicingAssetAtFairValueAmount | [1]
Associated Principal | 12,652,638 us-gaap_ServicingAsset |  | 13,667,930 us-gaap_ServicingAsset |
Conforming Loan |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
MSR Fair Value | 69,203 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |  | 81,301 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |
Associated Principal | 6,800,645 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |  | 7,705,146 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember |
Jumbo Loan |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
MSR Fair Value | 51,121 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |  | 57,992 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |
Associated Principal | $ 5,851,993 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |  | $ 5,962,784 us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember |
[1] | Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to the primary beneficiary (Redwood Trust, Inc.). At March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.

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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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