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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 5,688 | $ 36,834
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 344,890 | $ 699,655 | 344,890 | 1,038,451
MSRs recognized | 2,131 | 6,002 | 2,131 | 7,874
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 0 | 29,966 | 0 | 33,389
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 1,834 | $ 3,450 | $ 1,834 | $ 6,309

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