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Summary of Redwood's Interest in Third-Party Variable Interest Entity's (Detail) (Real Estate Securities, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Variable Interest Entity [Line Items]  
Assets $ 990,040
Senior Securities
 
Variable Interest Entity [Line Items]  
Assets 663,587
Re-REMIC
 
Variable Interest Entity [Line Items]  
Assets 192,596
Subordinate Securities
 
Variable Interest Entity [Line Items]  
Assets $ 133,857