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Derivative Financial Instruments - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
counterparty
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Derivative [Line Items]      
Notional amount $ 6,483,976 $ 3,663,084  
Accumulated other comprehensive income [1] $ 91,993 140,688  
Number of counterparties | counterparty 6    
Cash Flow Hedging | Interest Rate Swaps      
Derivative [Line Items]      
Notional amount $ 140,000    
Valuation adjustments on derivatives (1,000) (30,000) $ 32,000
Unsecuritized Residential and Commercial Loans      
Derivative [Line Items]      
Valuation adjustments on derivatives (65,000) (39,000) 51,000
Unsecuritized Residential and Commercial Loans | Interest Rate Contract      
Derivative [Line Items]      
Notional amount 2,620,000 920,000  
Unsecuritized Residential and Commercial Loans | Futures      
Derivative [Line Items]      
Notional amount 78,000 90,000  
Unsecuritized Residential and Commercial Loans | TBAs      
Derivative [Line Items]      
Notional amount 2,480,000 2,180,000  
Maximum      
Derivative [Line Items]      
Realized net losses reclassified from other comprehensive income (less than) 1,000 1,000 1,000
Maximum | Interest Rate Swaps      
Derivative [Line Items]      
Accumulated other comprehensive loss that will be amortized into interest expense (1,000)    
Mortgage Banking And Investment Activities      
Derivative [Line Items]      
Changes in fair value of assets (14,875) 20,783 85,706
Loan Purchase and Forward Sales Commitments | Mortgage Banking And Investment Activities      
Derivative [Line Items]      
Changes in fair value of assets 50,234 13,891 (399)
Net unrealized losses on interest rate agreements accounted for as cash flow hedges      
Derivative [Line Items]      
Accumulated other comprehensive income $ (47,363) $ (46,049) $ (15,888)
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At December 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,195,574 and $1,900,208, respectively. At December 31, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,050,861 and $1,546,490, respectively. See Note 4 for further discussion.