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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 Contract | Dec. 31, 2014 Contract
Short-term Debt [Line Items] |  |  |  |
Number of Facilities | 18 rwt_NumberOfFacilities |  | 17 rwt_NumberOfFacilities |
Outstanding | $ 1,502,164,000 us-gaap_ShortTermBorrowings | [1] | $ 1,793,825,000 us-gaap_ShortTermBorrowings | [1]
Residential Loans |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Number of Facilities | 5 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |  | 5 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |
Outstanding | 815,037,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |  | 1,076,188,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |
Limit | 1,550,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |  | 1,550,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |
Residential Loans | Minimum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2015-04 |  | 2015-02 |
Residential Loans | Maximum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2016-02 |  | 2015-12 |
Commercial Loans |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Number of Facilities | 3 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |  | 3 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |
Outstanding | 80,858,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |  | 109,128,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |
Limit | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |  | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |
Commercial Loans | Minimum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2015-04 |  | 2015-04 |
Commercial Loans | Maximum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2016-10 |  | 2016-10 |
Real Estate Securities |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Number of Facilities | 10 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember |  | 9 rwt_NumberOfFacilities / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember |
Outstanding | $ 606,269,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember |  | $ 608,509,000 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember |
Real Estate Securities | Minimum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2015-04 |  | 2015-01 |
Real Estate Securities | Maximum |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maturity | 2015-06 |  | 2015-03 |
[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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