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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
Sep. 30, 2015
Dec. 31, 2014
On-balance sheet assets, at fair value:    
Maximum loss exposure $ 407,490 $ 611,593
Principal balance of loans outstanding 7,289,025 7,276,825
Principal balance of delinquent loans 30+ days delinquent 14,204 17,022
Interest-only, senior and subordinate securities, classified as trading    
On-balance sheet assets, at fair value:    
Securities 61,602 93,802
Senior and subordinate securities, classified as AFS    
On-balance sheet assets, at fair value:    
Securities 292,948 460,990
Mortgage servicing rights    
On-balance sheet assets, at fair value:    
Securities $ 52,940 $ 56,801