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Principles of Consolidation - Key Assumptions and Sensitivity Analysis for Assets Retained from Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Mortgage servicing rights |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |
Fair value | $ 52,940 | $ 56,801
Expected life (in years) | 6 years | 7 years
Prepayment speed assumption (annual CPR) | 14.00% | 14.00%
Decrease in fair value from: |  |
10% adverse change | $ 1,542 | $ 2,419
25% adverse change | $ 5,003 | $ 5,639
Discount rate assumption | 11.00% | 11.00%
Decrease in fair value from: |  |
100 basis point increase | $ 933 | $ 2,104
200 basis point increase | 2,773 | 4,102
Senior Securities |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |
Fair value | $ 51,308 | $ 93,802
Expected life (in years) | 6 years | 6 years
Prepayment speed assumption (annual CPR) | 11.00% | 9.00%
Decrease in fair value from: |  |
10% adverse change | $ 1,308 | $ 3,999
25% adverse change | $ 3,103 | $ 9,475
Discount rate assumption | 11.00% | 8.00%
Decrease in fair value from: |  |
100 basis point increase | $ 1,984 | $ 4,214
200 basis point increase | $ 3,826 | $ 8,091
Credit loss assumption | 0.25% | 0.25%
Decrease in fair value from: |  |
10% higher losses | $ 31 | $ 126
25% higher losses | 76 | 299
Interest Only Securities |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |
Fair value | 29,000 | 88,000
Subordinate Securities |  |
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items] |  |
Fair value | $ 303,242 | $ 460,990
Expected life (in years) | 11 years | 10 years
Prepayment speed assumption (annual CPR) | 12.00% | 10.00%
Decrease in fair value from: |  |
10% adverse change | $ 953 | $ 684
25% adverse change | $ 2,252 | $ 2,355
Discount rate assumption | 5.00% | 5.00%
Decrease in fair value from: |  |
100 basis point increase | $ 22,816 | $ 34,149
200 basis point increase | $ 42,885 | $ 64,474
Credit loss assumption | 0.25% | 0.25%
Decrease in fair value from: |  |
10% higher losses | $ 3,050 | $ 3,169
25% higher losses | $ 7,567 | $ 7,841

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- Definition The hypothetical financial impact of a 200 basis point adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References No definition available. + Details
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- Definition Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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- Definition The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a 10 percent adverse change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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- Definition The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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- Definition A specified percentage variance in the discount rate assumption in the determination of fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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