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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.