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Components of Net Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Net operating loss carryforward - state $ 91,579us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal $ 90,138us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Net capital loss carryforward - state 27,308rwt_DeferredTaxAssetsCapitalLossCarryforwardsStateAndLocal 34,189rwt_DeferredTaxAssetsCapitalLossCarryforwardsStateAndLocal
Net operating loss carryforward - federal 18,765us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 10,254us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Net capital loss carryforward - federal 7,903rwt_DeferredTaxAssetsCapitalLossCarryforwardsDomestic 6,905rwt_DeferredTaxAssetsCapitalLossCarryforwardsDomestic
Allowances and accruals 2,355us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 5,667us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Other 210us-gaap_DeferredTaxAssetsOther 170us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 148,120us-gaap_DeferredTaxAssetsGross 147,323us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities    
Real estate assets (44,402)rwt_DeferredTaxLiabilitiesRealEstateAssets (34,935)rwt_DeferredTaxLiabilitiesRealEstateAssets
Interest rate agreements (87)us-gaap_DeferredTaxLiabilitiesDerivatives (535)us-gaap_DeferredTaxLiabilitiesDerivatives
Tax effect of unrealized gains - OCI (2,684)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome  
Total deferred tax liabilites (47,173)us-gaap_DeferredTaxLiabilities (35,470)us-gaap_DeferredTaxLiabilities
Valuation allowance (111,183)us-gaap_DeferredTaxAssetsValuationAllowance (119,169)us-gaap_DeferredTaxAssetsValuationAllowance
Total Deferred Tax Liabilities, net of Valuation Allowance $ (10,236)us-gaap_DeferredTaxAssetsNet $ (7,316)us-gaap_DeferredTaxAssetsNet