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Equity Compensation Plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock available for grant under Redwood's Incentive Plan (in shares) 4,298,376 4,616,776
Unrecognized compensation cost $ 29,233 $ 25,122
Weighted average amortization period remaining for equity awards (less than) 2 years  
Shares of common stock to be purchased in aggregate for all employees (in shares) 450,000  
Number of shares purchased by employees (in shares) 397,945 390,569
Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 218,022 339,482
Number of stock awards granted (in shares) 0  
Number of stock awards vested (in shares) 116,584  
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) 197,480 4,876
Number of stock awards granted (in shares) 192,604  
Number of stock awards vested (in shares) 0  
Number of stock awards forfeited (in shares) 0  
Deferred Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 2,396,886 2,336,720
Number of stock awards granted (in shares) 266,173  
Number of stock awards vested (in shares) 1,119,692 1,181,622
Number of stock awards forfeited (in shares) 0  
Stock units distributed (in shares) 206,007  
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested outstanding stock awards (in shares) 725,616 725,616
Share-based compensation, vesting period (in years) 3 years