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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 36,834 | $ 11,976
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 699,655 | $ 347,305 | 1,038,451 | 347,305
MSRs recognized | 6,002 | 2,186 | 7,874 | 2,186
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 29,966 | 69,563 | 33,389 | 69,563
Variable Interest Entity, Not Primary Beneficiary | Available-for-sale Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 3,450 | $ 20,428 | $ 6,309 | $ 20,428

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