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Principles of Consolidation - Mortgage Servicing Rights Assumptions Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Subordinate Securities |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Credit loss assumptions | 0.25% | 0.25% | 0.25% | 0.25%
Senior Securities |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Credit loss assumptions | 0.25% | 0.25% | 0.25% | 0.25%
Variable Interest Entity, Not Primary Beneficiary | Subordinate Securities |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Prepayment rate | 8.00% | 10.00% | 8.00% | 10.00%
Discount rates | 6.00% | 5.00% | 6.00% | 5.00%
Variable Interest Entity, Not Primary Beneficiary | Senior Securities |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Prepayment rate | 8.00% | 10.00% | 8.00% | 10.00%
Discount rates | 3.00% | 3.00% | 3.00% | 3.00%
Variable Interest Entity, Not Primary Beneficiary | Mortgage servicing rights |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Discount rates | 11.00% | 11.00% | 11.00% | 11.00%
Variable Interest Entity, Not Primary Beneficiary | Mortgage servicing rights | Minimum |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Prepayment rate | 5.00% | 5.00% | 5.00% | 5.00%
Variable Interest Entity, Not Primary Beneficiary | Mortgage servicing rights | Maximum |  |  |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |  |  |
Prepayment rate | 13.00% | 15.00% | 15.00% | 15.00%

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 + Details
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- Definition Rate at which principal will not be repaid on securitized financial assets, including for example, but not limited to, expected static pool losses for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 + Details
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