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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 | 12 Months Ended
--- | ---
Dec. 31, 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 | $ 56,984 | $ 56,801
Expected life (in years) | 7 years | 7 years
Prepayment speed assumption (annual CPR) | 11.00% | 14.00%
Decrease in fair value from: |  |
10% adverse change | $ 2,868 | $ 2,419
25% adverse change | $ 6,119 | $ 5,639
Discount rate assumption | 11.00% | 11.00%
Decrease in fair value from: |  |
100 basis point increase | $ 2,711 | $ 2,104
200 basis point increase | 4,745 | 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 | $ 248,570 | $ 93,802
Expected life (in years) | 5 years | 6 years
Prepayment speed assumption (annual CPR) | 10.00% | 9.00%
Decrease in fair value from: |  |
10% adverse change | $ 2,042 | $ 3,999
25% adverse change | $ 4,810 | $ 9,475
Discount rate assumption | 5.00% | 8.00%
Decrease in fair value from: |  |
100 basis point increase | $ 10,029 | $ 4,214
200 basis point increase | $ 19,365 | $ 8,091
Credit loss assumption | 0.25% | 0.25%
Decrease in fair value from: |  |
10% higher losses | $ 35 | $ 126
25% higher losses | 86 | 299
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 | $ 282,842 | $ 460,990
Expected life (in years) | 12 years | 10 years
Prepayment speed assumption (annual CPR) | 12.00% | 10.00%
Decrease in fair value from: |  |
10% adverse change | $ 901 | $ 684
25% adverse change | $ 2,278 | $ 2,355
Discount rate assumption | 6.00% | 5.00%
Decrease in fair value from: |  |
100 basis point increase | $ 21,981 | $ 34,149
200 basis point increase | $ 41,156 | $ 64,474
Credit loss assumption | 0.25% | 0.25%
Decrease in fair value from: |  |
10% higher losses | $ 1,244 | $ 3,169
25% higher losses | 3,129 | 7,841
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 | $ 31,000 | $ 88,000

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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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