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Principles of Consolidation - Summary of Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
On-balance sheet assets, at fair value: |  |
Maximum loss exposure | $ 588,396 | $ 611,593
Principal balance of loans outstanding | 7,318,167 | 7,276,825
Principal balance of delinquent loans 30+ days delinquent | 18,300 | 17,022
Interest-Only and Senior Securities |  |
On-balance sheet assets, at fair value: |  |
Securities | 258,697 | 93,802
Senior and Subordinate Securities |  |
On-balance sheet assets, at fair value: |  |
Securities | 272,715 | 460,990
Mortgage Servicing Rights |  |
On-balance sheet assets, at fair value: |  |
Securities | $ 56,984 | $ 56,801

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