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Equity Compensation Plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 28,905 $ 27,664
Weighted average amortization period remaining for equity awards 1 year  
Shares of common stock to be purchased in aggregate for all employees (in shares) 600,000  
Number of shares purchased by employees (in shares) 505,346 489,886
Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 30,119 78,998
Number of stock awards granted (in shares) 0  
Number of stock awards vested (in shares) 48,879  
Number of stock awards forfeited (in shares) 0  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 458,554 282,424
Number of stock awards granted (in shares) 272,261  
Number of stock awards vested (in shares) 58,899  
Number of stock awards forfeited (in shares) 37,232  
Deferred Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 2,963,453 2,805,144
Number of stock awards granted (in shares) 312,045  
Number of stock awards vested (in shares) 1,248,084 1,206,125
Number of stock awards forfeited (in shares) 31,161  
Stock units distributed (in shares) 122,575  
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 978,735 978,735
Number of stock awards forfeited (in shares) 0  
Share-based compensation, vesting period (in years) 3 years  
Redwood Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for grant (in shares) 7,540,310 7,957,891
Redwood Incentive Plan | Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 395 $ 564
Redwood Incentive Plan | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost 5,012 3,540
Redwood Incentive Plan | Deferred Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost 18,096 17,766
Redwood Incentive Plan | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 5,208 $ 5,794