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Derivative Financial Instruments - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
counterparty
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
counterparty
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Derivative [Line Items]                
Notional amount $ 7,538,483   $ 7,538,483     $ 3,663,084    
Accumulated other comprehensive income (loss) [1] $ 119,721   $ 119,721     140,688    
Number of counterparties | counterparty 8   8          
Maximum                
Derivative [Line Items]                
Hedges decrease in value recorded as a component of interest expense (less than) $ 1,000 $ 100 $ 100 $ 100        
Net unrealized losses on interest rate agreements accounted for as cash flow hedges                
Derivative [Line Items]                
Accumulated other comprehensive income (loss) (50,995) (33,211) (50,995) (33,211) $ (38,965) (46,049) $ (29,985) $ (15,888)
Mortgage banking and investment activities                
Derivative [Line Items]                
Market valuations gains and losses, net (14,122) 12,796 (9,945) 7,731        
Loan Purchase and Forward Sales Commitments | Mortgage banking and investment activities                
Derivative [Line Items]                
Market valuations gains and losses, net 25,173 2,487 44,482 6,077        
Interest rate swaps | Maximum                
Derivative [Line Items]                
Accumulated other comprehensive loss that will be amortized into interest expense (less than) 1,000   1,000          
Interest rate swaps | Cash Flow Hedging                
Derivative [Line Items]                
Notional amount 140,000   140,000          
Valuation adjustments on derivatives (12,000) (3,000) (5,000) (17,000)        
Unsecuritized Residential and Commercial Loans                
Derivative [Line Items]                
Valuation adjustments on derivatives (29,000) $ (4,000)   $ (29,000)        
Unsecuritized Residential and Commercial Loans | Maximum                
Derivative [Line Items]                
Valuation adjustments on derivatives     (58,000)          
Unsecuritized Residential and Commercial Loans | Interest Rate Contract                
Derivative [Line Items]                
Notional amount 2,410,000   2,410,000     920,000    
Unsecuritized Residential and Commercial Loans | Futures                
Derivative [Line Items]                
Notional amount 36,000   36,000     90,000    
Unsecuritized Residential and Commercial Loans | TBAs                
Derivative [Line Items]                
Notional amount $ 3,380,000   $ 3,380,000     $ 2,180,000    
[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 September 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.