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Unrecognized Compensation Cost (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | $ 20,730 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Equity grants | 9,652 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  |
Equity grant forfeitures | (363)rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures |  |
Equity compensation expense | (9,750)us-gaap_AllocatedShareBasedCompensationExpense | (10,077)us-gaap_AllocatedShareBasedCompensationExpense | (9,784)us-gaap_AllocatedShareBasedCompensationExpense
Unrecognized Compensation Cost at End of Period | 20,269 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 20,730 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized Compensation Cost at End of Period | 1,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | (6,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember | (6,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember | (7,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember
Unrecognized Compensation Cost at End of Period | 12,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember |  |
Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity compensation expense | (3,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | (3,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | (2,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Unrecognized Compensation Cost at End of Period | 7,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Incentive Plans | Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost at beginning of period | 1,869 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity grants | 107 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity grant forfeitures | (213)rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity compensation expense | (672)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Unrecognized Compensation Cost at End of Period | 1,091 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 | 13,044 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity grants | 5,305 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity grant forfeitures | (150)rwt_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCostForfeitures / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity compensation expense | (5,895)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = rwt_DeferredStockUnitsMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Unrecognized Compensation Cost at End of Period | 12,304 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 | 5,817 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity grants | 4,025 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Equity compensation expense | (2,968)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = rwt_IncentivePlansMember |  |
Unrecognized Compensation Cost at End of Period | 6,874 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 | 215 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_PlanNameAxis = rwt_EmployeeStockPurchasePlanMember |  |
Equity compensation expense | $ (215)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = rwt_EmployeeStockPurchasePlanMember |  |

X
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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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