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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 52,297 | $ 30,962
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 0 | $ 635,608 | 1,038,451 | 982,913
MSRs recognized | 0 | 4,356 | 7,874 | 6,542
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 0 | 1,680 | 33,389 | 71,243
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 0 | $ 39,330 | $ 6,309 | $ 59,757

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