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Equity - Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to Redwood	$ 14,801us-gaap_NetIncomeLoss	$ 12,333us-gaap_NetIncomeLoss
Less: Dividends and undistributed earnings allocated to participating securities	(822)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	(702)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net income allocated to common shareholders	13,979us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	11,631us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average common shares outstanding (shares)	83,360,312us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	82,410,562us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share (usd per share)	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic
Less: Dividends and undistributed earnings allocated to participating securities	(822)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	(702)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Net income allocated to common shareholders	$ 13,979us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 11,631us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net effect of dilutive equity awards	2,261,904us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	2,529,978us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average common shares outstanding (shares)	85,622,216us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	84,940,540us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share (usd per share)	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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