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Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Income Taxes [Line Items] |
Percentage prohibited transaction tax for not meeting the requirements of statutory relief | 100.00%rwt_ProhibitedTransactionTaxRate
Federal |
Income Taxes [Line Items] |
Estimated operating loss carry forwards | 70 rwt_EstimatedOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Net Operating Loss carry forwards | 55 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Net Operating Loss carry forwards, expiring year | 2028
Federal | Minimum |
Income Taxes [Line Items] |
Net Operating Loss carry forwards, expiring year | 2030
Federal | Maximum |
Income Taxes [Line Items] |
Net Operating Loss carry forwards, expiring year | 2034
State and Local Jurisdiction |
Income Taxes [Line Items] |
Net Operating Loss carry forwards | 1,300 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Net Operating Loss carry forwards, expiring year | 2028

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- Definition Estimated Operating Loss Carryforwards + References No definition available. + Details
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- Details
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- Definition Operating Loss Carryforwards, Expiration Year + References No definition available. + Details
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- Definition Prohibited Transaction Tax Rate + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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