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Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	70rwt_EstimatedOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Net Operating Loss carry forwards	55us-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	1,300us-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

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- Definition

Operating Loss Carryforwards, Expiration Year

+ References

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- Definition

Prohibited Transaction Tax Rate

+ References

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X

- 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

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