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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Servicing Assets at Fair Value [Line Items] |  |  |
Balance at beginning of period | $ 139,293 us-gaap_ServicingAssetAtFairValueAmount | [1] |
Additions | 15,675 us-gaap_ServicingAssetAtFairValueAdditions |  | 2,294 us-gaap_ServicingAssetAtFairValueAdditions
Changes in fair value due to: |  |  |
Balance at End of Period | 120,324 us-gaap_ServicingAssetAtFairValueAmount | [1] |
Mortgage Servicing Rights |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Balance at beginning of period | 139,293 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Additions | 18,754 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | 2,858 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Sales | (18,206)us-gaap_ServicingAssetAtFairValueDisposals / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | 0 us-gaap_ServicingAssetAtFairValueDisposals / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Changes in fair value due to: |  |  |
Changes in assumptions | (14,036)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | (1,125)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Other changes | (5,481)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | (1,586)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Balance at End of Period | $ 120,324 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | $ 64,971 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
[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 The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing assets. + 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)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + 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)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + 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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- Definition Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties. + 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)(3) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets. + 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)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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