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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, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
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 | $ 59,890 |  | $ 60,318 |
Expected life (in years) | 7 years | [1] | 8 years | [1]
Prepayment speed assumption (annual CPR) | 12.00% | [1] | 8.00% | [1]
Decrease in fair value from: |  |  |  |
10% adverse change | 2,454 |  | 1,649 |
25% adverse change | 5,589 |  | 4,218 |
Discount rate assumption | 11.00% | [1] | 11.00% | [1]
Decrease in fair value from: |  |  |  |
100 basis point increase | 2,381 |  | 2,468 |
200 basis point increase | 4,568 |  | 4,828 |
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 | 100,613 |  | 110,505 |
Expected life (in years) | 6 years | [1] | 7 years | [1]
Prepayment speed assumption (annual CPR) | 9.00% | [1] | 10.00% | [1]
Decrease in fair value from: |  |  |  |
10% adverse change | 4,552 |  | 5,773 |
25% adverse change | 10,470 |  | 13,555 |
Discount rate assumption | 7.00% | [1] | 5.00% | [1]
Decrease in fair value from: |  |  |  |
100 basis point increase | 4,444 |  | 5,632 |
200 basis point increase | 8,528 |  | 10,757 |
Credit loss assumption | 0.25% | [1] | 0.23% | [1]
Decrease in fair value from: |  |  |  |
10% higher losses | 144 |  | 70 |
25% higher losses | 349 |  | 175 |
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 | 441,835 |  | 405,415 |
Expected life (in years) | 10 years | [1] | 11 years | [1]
Prepayment speed assumption (annual CPR) | 10.00% | [1] | 11.00% | [1]
Decrease in fair value from: |  |  |  |
10% adverse change | 404 |  | 1,658 |
25% adverse change | 2,058 |  | 4,354 |
Discount rate assumption | 9.00% | [1] | 6.00% | [1]
Decrease in fair value from: |  |  |  |
100 basis point increase | 33,310 |  | 30,644 |
200 basis point increase | 62,862 |  | 57,836 |
Credit loss assumption | 0.25% | [1] | 0.23% | [1]
Decrease in fair value from: |  |  |  |
10% higher losses | 3,132 |  | 1,369 |
25% higher losses | $ 7,779 |  | $ 3,420 |
[1] | Expected life, prepayment speed assumption, discount rate assumption, and credit loss assumption presented in the tables above represent weighted averages.

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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=13989330&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=13989330&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=13989330&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=13989330&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=13989330&loc=d3e107314-111719 + Details
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