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Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2014
Mar. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
Transition period for subsidiary to be a FHLB-member     5 years    
Existing debt     $ 0   $ 0
Federal home loan bank stock     44,071,000   34,437,000
Accrued interest payable     3,000,000   2,000,000
Accrued interest payable balance on long-term debt (less than) [1]     $ 15,522,000   8,936,000
Exchangeable Senior Notes          
Debt Instrument [Line Items]          
Interest expense yield     6.54% 6.52%  
Senior Notes due 2018          
Debt Instrument [Line Items]          
Interest expense yield     5.41% 5.36%  
FHLB Chicago          
Debt Instrument [Line Items]          
Federal home loan bank advances, reset period of basis margin     91 days    
FHLB Member Subsidiary | FHLB Chicago          
Debt Instrument [Line Items]          
Maximum borrowing limit     $ 2,000,000,000    
Additional borrowings from FHLBC     519,000,000    
Existing debt     2,000,000,000    
Federal home loan bank advances outstanding     $ 2,000,000,000   1,480,000,000
Outstanding advances classified as long-term debt         $ 1,340,000,000
Weighted average interest rate     0.58%   0.46%
Weighted average maturity     9 years   9 years
Secured Debt          
Debt Instrument [Line Items]          
Commercial mortgage loans     $ 65,000,000    
Convertible Debt | Exchangeable Senior Notes          
Debt Instrument [Line Items]          
Convertible notes $ 205,000,000   201,000,000    
Debt Instrument interest rate 5.625%        
Debt instrument maturity year 2019        
Debt instrument redemption date Nov. 15, 2019        
Net proceeds from issuance of convertible debt $ 198,000,000        
Accrued interest payable     4,000,000    
Unamortized Debt Issuance Expense     $ 5,000,000    
Convertible senior notes conversion rate     0.0461798    
Convertible senior notes conversion per share     $ 21.65    
Amount of debt repurchased     $ 4,000,000    
Convertible Debt | Convertible Senior Notes Due 2018          
Debt Instrument [Line Items]          
Convertible notes   $ 288,000,000      
Debt Instrument interest rate   4.625%      
Net proceeds from issuance of convertible debt   $ 279,000,000      
Accrued interest payable     7,000,000    
Unamortized Debt Issuance Expense     $ 4,000,000    
Convertible senior notes conversion rate     0.041132    
Convertible senior notes conversion per share     $ 24.31    
Trust Preferred Securities          
Debt Instrument [Line Items]          
Interest expense yield     2.85% 2.52%  
Debt instrument face amount     $ 100,000,000    
Percentage of yield of debt securities     6.86% 6.81%  
Accrued interest payable balance on long-term debt (less than)     $ 1,000,000   $ 1,000,000
Subordinated Notes          
Debt Instrument [Line Items]          
Interest expense yield     2.85% 2.52%  
Debt instrument face amount     $ 40,000,000    
Percentage of yield of debt securities     6.86% 6.81%  
Accrued interest payable balance on long-term debt (less than)     $ 1,000,000    
Gain (Loss) on Investments [Member] | Convertible Debt | Exchangeable Senior Notes          
Debt Instrument [Line Items]          
Gains on extinguishment of debt     $ 300,000    
[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 March 31, 2016 and December 31, 2015, assets of consolidated VIEs totaled $1,102,195 and $1,195,574, respectively. At March 31, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $959,464 and $1,050,861, respectively. See Note 4 for further discussion.