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Equity Compensation Plans - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) executive shares | Mar. 31, 2015 shares | Dec. 31, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares of common stock available for grant under Redwood's Incentive Plan | 1,391,379 |  | 1,665,032
Unrecognized compensation cost | $ | $ 19,532 |  | $ 23,608
Share-based compensation, vesting period | 3 years |  |
Equity compensation expense | $ | $ 5,818 |  |
Number of shares purchased by employees | 316,990 | 310,040 |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards | 223,914 |  | 187,180
Number of stock awards granted | 144,056 |  |
Number of stock awards vested | 48,061 |  |
Number of stock awards forfeited | 59,261 |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards | 2,680,320 |  | 2,407,154
Number of stock awards granted | 281,014 |  |
Number of stock awards vested | 1,707,272 | 1,363,548 |
Number of stock awards forfeited | 7,849 |  |
Number of stock awards distributed | 0 |  |
Equity compensation expense | $ | $ 3,000 |  |
Number of executives departed | executive | 2 |  |
Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards | 656,549 |  | 849,021
Share-based compensation, vesting period | 3 years |  |
Equity compensation expense | $ | $ 600 |  |
Number of executives departed | executive | 2 |  |
Share-based compensation, vesting year | 2016 and in future years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average amortization period remaining for equity awards (less than) | 2 years |  |
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 | Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity awards, vesting percentage | 0.00% |  |

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