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Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock available for grant under Redwood's Incentive Plan 2,225,245 1,963,148 2,225,245
Unrecognized compensation cost $ 20,269 $ 19,592 $ 20,269
Weighted average amortization period remaining for equity awards (less than)   2 years  
Number of shares purchased by employees   300,851 274,318
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards 109,464 188,938 109,464
Number of stock awards granted   141,069  
Number of stock awards vested   40,917  
Number of stock awards forfeited   20,678  
Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards 2,168,824 2,142,742 2,168,824
Number of stock awards granted   319,546  
Number of stock awards vested   1,291,007 1,287,862
Number of stock awards forfeited   10,167  
Number of stock awards distributed   335,461  
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards 761,051 761,051 761,051
Number of stock awards vested 701,440    
Share-based compensation, vesting period   3 years  
Share-based compensation, vesting year   2015 and in future years  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock to be purchased in aggregate for all employees   450,000  
Maximum | Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards, vesting percentage   200.00%  
Total Shareholder Return (TSR) percentage to determine vested shares (greater than)   125.00%  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, vesting period   3 years  
Minimum | Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards, vesting percentage   0.00%