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Basis of Presentation - Additional Information (Detail)	Dec. 31, 2014
Basis of Presentation [Line Items]
Minimum percentage of taxable income distribution to shareholders to be taxed as a REIT	90.00%rwt_MinimumPercentageOfTaxableIncomeDistributionToShareholders

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- Definition

Minimum Percentage of Taxable Income Distribution to Shareholders

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No definition available.

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