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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |  |
MSRs recognized | $ 64,725 | $ 48,000 | $ 44,063
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal balance of loans transferred | 1,375,532 | 1,324,419 |
MSRs recognized | 8,202 | 8,518 |
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities retained, at fair value | 252,222 | 77,160 |
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities retained, at fair value | $ 7,852 | $ 78,218 |

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