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Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.78 us-gaap_EarningsPerShareBasic | $ 0.72 us-gaap_EarningsPerShareBasic | $ 1.18 us-gaap_EarningsPerShareBasic | $ 2.05 us-gaap_EarningsPerShareBasic | $ 1.61 us-gaap_EarningsPerShareBasic
Net income attributable to Redwood | $ 27,122 us-gaap_NetIncomeLoss | $ 45,097 us-gaap_NetIncomeLoss | $ 16,017 us-gaap_NetIncomeLoss | $ 12,333 us-gaap_NetIncomeLoss | $ 25,135 us-gaap_NetIncomeLoss | $ 21,929 us-gaap_NetIncomeLoss | $ 65,573 us-gaap_NetIncomeLoss | $ 60,160 us-gaap_NetIncomeLoss | $ 100,569 us-gaap_NetIncomeLoss | $ 173,246 us-gaap_NetIncomeLoss | $ 131,769 us-gaap_NetIncomeLoss
Basic weighted average common shares outstanding |  |  |  |  |  |  |  |  | 82,837,369 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,985,897 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 79,529,950 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of dilutive equity awards |  |  |  |  |  |  |  |  | 985,591 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  |
Net effect of assumed convertible notes conversion to common shares |  |  |  |  |  |  |  |  | 11,825,450 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 9,751,946 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities |
Diluted weighted average common shares outstanding |  |  |  |  |  |  |  |  | 85,098,579 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 93,694,924 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 80,673,682 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted Earnings Per Common Share | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.71 us-gaap_EarningsPerShareDiluted | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted | $ 1.94 us-gaap_EarningsPerShareDiluted | $ 1.59 us-gaap_EarningsPerShareDiluted
Basic Earnings (Loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Redwood |  |  |  |  |  |  |  |  | 100,569 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 173,246 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 131,769 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember
Less: Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (2,612)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | (4,899)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | (3,886)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember
Net income allocated to common shareholders |  |  |  |  |  |  |  |  | 97,957 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 168,347 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 127,883 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember
Basic weighted average common shares outstanding |  |  |  |  |  |  |  |  | 82,837,369 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 81,985,897 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember | 79,529,950 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_BasicEarningsPerShareMember
Diluted Earnings (Loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Redwood |  |  |  |  |  |  |  |  | 100,569 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 173,246 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 131,769 us-gaap_NetIncomeLoss / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember
Less: Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (2,524)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | (3,726)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | (3,212)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember
Add back: Interest expense on convertible notes |  |  |  |  |  |  |  |  |  | 12,641 us-gaap_InterestOnConvertibleDebtNetOfTax / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember |
Net income allocated to common shareholders |  |  |  |  |  |  |  |  | $ 98,045 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | $ 182,161 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | $ 128,557 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember
Basic weighted average common shares outstanding |  |  |  |  |  |  |  |  | 82,837,369 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 81,985,897 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 79,529,950 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember
Net effect of dilutive equity awards |  |  |  |  |  |  |  |  | 2,261,210 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 1,957,081 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 1,143,732 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember
Net effect of assumed convertible notes conversion to common shares |  |  |  |  |  |  |  |  |  | 9,751,946 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember |
Diluted weighted average common shares outstanding |  |  |  |  |  |  |  |  | 85,098,579 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 93,694,924 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember | 80,673,682 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / rwt_EarningsPerShareReconciliationAxis = rwt_DilutedEarningsPerShareMember

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