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Market Valuation Adjustments, Net (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage banking activities market valuation adjustments |  |  |  |  |  |
Sequoia IO securities | $ (23,839)us-gaap_IncreaseDecreaseInTradingSecurities |  | $ 42,451 us-gaap_IncreaseDecreaseInTradingSecurities |  | $ (11,702)us-gaap_IncreaseDecreaseInTradingSecurities |
Risk management derivatives, net | (31,167)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet |  | 51,162 rwt_MortgageBankingActivitiesDerivativeInstrumentsNet |  | (10,609)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet |
Loan purchase and forward sale commitments | 13,891 rwt_LoanPurchaseSaleCommitmentValuations |  | (399)rwt_LoanPurchaseSaleCommitmentValuations |  |  |
Total mortgage banking activities market valuation adjustments, net | 30,929 rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet | [1] | 91,415 rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet | [1] | 15,451 rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet | [1]
MSRs | (21,081)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights |  | 11,995 rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights |  | (2,014)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (10,146)rwt_OtherMarketValuationAdjustmentsNet | [2] | (5,709)rwt_OtherMarketValuationAdjustmentsNet | [2] | 1,539 rwt_OtherMarketValuationAdjustmentsNet | [2]
Total Market Valuation Adjustments, Net | (298)rwt_MarketValuationAdjustmentsNet |  | 97,701 rwt_MarketValuationAdjustmentsNet |  | 14,976 rwt_MarketValuationAdjustmentsNet |
Residential Loans at Fair Value |  |  |  |  |  |
Mortgage banking activities market valuation adjustments |  |  |  |  |  |
Loans, at fair value | 51,256 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |  | (10,493)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |  | 37,762 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Commercial Loans at Fair Value |  |  |  |  |  |
Mortgage banking activities market valuation adjustments |  |  |  |  |  |
Loans, at fair value | 20,788 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember |  | 8,694 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net |  |  |  |  | 241 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember |
Residential Loans at Lower of Cost or Fair Value |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | 56 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |  | 38 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |  | 623 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Residential Loans HFI, Fair Value |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (697)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentFairValueMember |  |  |  |  |
Trading Securities |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (358)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember |  | (3,525)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember |  | 97,867 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember |
Impairments on AFS Securities |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (565)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember |  | (1,833)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember |  | (2,509)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember |
REO |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (894)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherRealEstateOwnedMember |  | (612)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherRealEstateOwnedMember |  | (344)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherRealEstateOwnedMember |
Other Derivative Instruments |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | (7,792)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember |  | 223 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember |  | (12,581)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember |
Asset-backed Securities | Acacia |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net |  |  |  |  | (81,758)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_AcaciaSecuritizationEntitiesMember |
Other |  |  |  |  |  |
Other market valuation adjustments |  |  |  |  |  |
Other market valuation adjustments, net | $ 104 rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherMemberMember |  |  |  |  |
[1] | Income from mortgage banking activities presented above does not include fee income or provisions for repurchases that is a component of mortgage banking activities presented on our consolidated statements of income as these amounts do not represent a market valuation adjustment.
[2] | For the year ended December 31, 2014, other-than-temporary impairments were $4,774, of which $565 were recognized through the Income Statement, and $4,209 were recognized in Accumulated Other Comprehensive Income (Loss). For the year ended December 31, 2013, other-than-temporary impairments were $4,532, of which $1,833 were recognized through the Income Statement, and $2,699 were recognized in Accumulated Other Comprehensive Income (Loss). For the year ended December 31, 2012, other-than-temporary impairments were $3,536 of which $2,509 were recognized through the Income Statement, and $1,027 were recognized in Accumulated Other Comprehensive Income (Loss).

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