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Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2014
Mar. 31, 2013
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]              
Transition period for subsidiary to be a FHLB-member         5 years    
Existing debt     $ 0   $ 0   $ 0
Federal home loan bank stock     43,393,000   43,393,000   34,437,000
Accrued interest payable     3,000,000   3,000,000   2,000,000
Accrued interest payable balance on long-term debt (less than) [1]     $ 9,515,000   9,515,000   8,936,000
Exchangeable Senior Notes              
Debt Instrument [Line Items]              
Interest expense yield     6.52% 6.58%   6.51%  
Senior Notes due 2018              
Debt Instrument [Line Items]              
Interest expense yield     5.37% 5.41%   5.39%  
Secured Debt              
Debt Instrument [Line Items]              
Commercial mortgage loans     $ 65,000,000   65,000,000    
Convertible Debt | Exchangeable Senior Notes              
Debt Instrument [Line Items]              
Convertible notes $ 205,000,000   201,000,000   $ 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            
Interest expense yield         6.53%    
Accrued interest payable     2,000,000   $ 2,000,000    
Unamortized Debt Issuance Expense     $ (5,000,000)   $ (5,000,000)    
Convertible senior notes conversion rate         0.0461798    
Convertible senior notes conversion per share     $ 21.65   $ 21.65    
Amount of debt repurchased     $ 4,000,000   $ 4,000,000    
Convertible Debt | Exchangeable Senior Notes | Gain (loss) on investments              
Debt Instrument [Line Items]              
Gain on extinguishment of debt         $ 300,000    
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          
Interest expense yield         5.38%    
Accrued interest payable     3,000,000   $ 3,000,000    
Unamortized Debt Issuance Expense     $ (3,000,000)   $ (3,000,000)    
Convertible senior notes conversion rate         0.041132    
Convertible senior notes conversion per share     $ 24.31   $ 24.31    
Trust Preferred Securities              
Debt Instrument [Line Items]              
Interest expense yield     2.97% 2.63% 2.91% 2.58%  
Debt instrument face amount     $ 99,500,000   $ 99,500,000    
Percentage of yield of debt securities     6.87% 6.85% 6.86% 6.85%  
Accrued interest payable balance on long-term debt (less than)     $ 1,000,000   $ 1,000,000   1,000,000
Subordinated Notes              
Debt Instrument [Line Items]              
Interest expense yield         2.91% 2.58%  
Debt instrument face amount     40,000,000   $ 40,000,000    
Percentage of yield of debt securities         6.86% 6.85%  
Accrued interest payable balance on long-term debt (less than)     1,000,000   $ 1,000,000    
FHLB Chicago              
Debt Instrument [Line Items]              
Federal home loan bank advances, reset period of basis margin         91 days    
FHLB Chicago | Residential Loans              
Debt Instrument [Line Items]              
Loans pledged as collateral under borrowing agreement with FHLBC     2,270,000,000   $ 2,270,000,000    
FHLB Member Subsidiary | FHLB Chicago              
Debt Instrument [Line Items]              
Maximum borrowing limit     2,000,000,000   2,000,000,000    
Additional borrowings from FHLBC     0   519,000,000    
Existing debt     2,000,000,000   2,000,000,000    
Federal home loan bank advances outstanding     $ 2,000,000,000   $ 2,000,000,000   $ 1,480,000,000
Weighted average interest rate     0.57%   0.57%   0.46%
Weighted average maturity         9 years   9 years
Outstanding advances classified as long-term debt             $ 1,340,000,000
[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.