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Equity Compensation Plans - Unrecognized Compensation Cost (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost at beginning of period | $ 20,269 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |
Equity grants | 8,034 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |
Equity grant forfeitures | (162)rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures |
Equity compensation expense | (2,738)us-gaap_AllocatedShareBasedCompensationExpense | (2,330)us-gaap_AllocatedShareBasedCompensationExpense
Unrecognized Compensation Cost at End of Period | 25,403 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |
Incentive Plans | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost at beginning of period | 1,091 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity grants | 2,636 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity grant forfeitures | (162)rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity compensation expense | (250)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Unrecognized Compensation Cost at End of Period | 3,315 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Incentive Plans | Deferred Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost at beginning of period | 12,304 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity grants | 5,162 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity grant forfeitures | 0 rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity compensation expense | (1,575)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Unrecognized Compensation Cost at End of Period | 15,891 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Incentive Plans | Performance Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost at beginning of period | 6,874 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity grants | 0 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Equity compensation expense | (854)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Unrecognized Compensation Cost at End of Period | 6,020 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity grants | 236 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = rwt_EmployeeStockPurchasePlanMember |
Equity compensation expense | (59)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = rwt_EmployeeStockPurchasePlanMember |
Unrecognized Compensation Cost at End of Period | $ 177 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = rwt_EmployeeStockPurchasePlanMember |

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- Definition Represents the amount of equity grant forfeitures during the period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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