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Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 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 1,987,975 2,225,245
Unrecognized compensation cost $ 20,269 $ 22,473 $ 20,269
Weighted average amortization period remaining for equity awards (less than)   2 years  
Number of shares purchased by employees   292,145 274,318
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards 109,464 187,669 109,464
Number of stock awards granted   139,526  
Number of stock awards vested   40,643  
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 2,169,028 2,168,824
Number of stock awards granted   314,527  
Number of stock awards vested   1,235,082 1,287,862
Number of stock awards forfeited   0  
Number of stock awards distributed   314,323  
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%