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Principles of Consolidation - Assumptions Related to Assets Retained from Unconsolidated VIEs Sponsored by Redwood (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Mortgage Servicing Rights | Variable Interest Entity, Not Primary Beneficiary |  |
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%
Mortgage Servicing Rights | Variable Interest Entity, Not Primary Beneficiary | Minimum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 5.00% | 5.00%
Mortgage Servicing Rights | Variable Interest Entity, Not Primary Beneficiary | Maximum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 15.00% | 16.00%
Senior Securities |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses |  | 0.25%
Senior Securities | Minimum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses | 0.10% |
Senior Securities | Maximum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses | 0.25% |
Senior Securities | Variable Interest Entity, Not Primary Beneficiary |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Discount rates | 3.00% | 3.00%
Senior Securities | Variable Interest Entity, Not Primary Beneficiary | Minimum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 8.00% | 8.00%
Senior Securities | Variable Interest Entity, Not Primary Beneficiary | Maximum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 10.00% | 10.00%
Subordinate Securities |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses | 0.25% | 0.25%
Subordinate Securities | Minimum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities, Expected Credit Losses | 0.10% |
Subordinate Securities | Variable Interest Entity, Not Primary Beneficiary |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Discount rates | 6.00% | 5.00%
Subordinate Securities | Variable Interest Entity, Not Primary Beneficiary | Minimum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 8.00% | 8.00%
Subordinate Securities | Variable Interest Entity, Not Primary Beneficiary | Maximum |  |
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items] |  |
Prepayment speeds | 10.00% | 10.00%

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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=51814546&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=51814546&loc=d3e107207-111719 + Details
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