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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
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Variable Interest Entity [Line Items] |  |
MSRs recognized | $ 3,463 | $ 15,675
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Principal balance of loans transferred | 0 | 338,796
MSRs recognized | 0 | 1,872
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | 0 | 3,423
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | $ 0 | $ 2,859

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