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Derivative Financial Instruments - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
counterparty
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
counterparty
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]            
Notional amount $ 6,112,412   $ 6,112,412   $ 6,483,976  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,092,603 [1] $ 1,264,784 1,092,603 [1] $ 1,264,784 1,146,265 [1] $ 1,256,141
Accumulated other comprehensive income (loss) [1] $ 46,331   $ 46,331   91,993  
Number of counterparties | counterparty 4   4      
Net unrealized losses on interest rate agreements accounted for as cash flow hedges            
Derivative [Line Items]            
Accumulated other comprehensive income (loss)         (47,363)  
Mortgage banking activities            
Derivative [Line Items]            
Market valuations gains and losses, net $ 7,442 5,884 $ 14,679 7,114    
Loan Purchase and Forward Sales Commitments | Mortgage banking activities            
Derivative [Line Items]            
Market valuations gains and losses, net 10,852 1,054 23,487 19,309    
Interest rate swaps | Cash Flow Hedging            
Derivative [Line Items]            
Notional amount 140,000   140,000      
Valuation adjustments on derivatives (9,000) 15,000 (23,000) 7,000    
Unsecuritized Residential and Commercial Loans            
Derivative [Line Items]            
Valuation adjustments on derivatives 2,000 $ (17,000) (5,000) $ (29,000)    
Unsecuritized Residential and Commercial Loans | Interest rate contract            
Derivative [Line Items]            
Notional amount 2,160,000   2,160,000   2,620,000  
Unsecuritized Residential and Commercial Loans | TBAs            
Derivative [Line Items]            
Notional amount 2,510,000   2,510,000   2,480,000  
Unsecuritized Residential and Commercial Loans | Futures            
Derivative [Line Items]            
Notional amount $ 140,000   $ 140,000   $ 78,000  
[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 June 30, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.