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Equity Compensation Plans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 USD ($) executive | Jun. 30, 2016 USD ($) 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 |  | 1,624,283 | 1,665,032
Unrecognized compensation cost | $ |  | $ 16,630 | $ 23,608
Equity compensation expense | $ |  | $ 8,569 |
Share-based compensation, vesting period |  | 3 years |
Number of shares purchased by employees |  | 323,113 | 310,040
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards |  | 208,559 | 187,180
Number of stock awards granted |  | 144,056 |
Number of stock awards vested |  | 48,061 |
Number of stock awards forfeited |  | 74,616 |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards |  | 2,013,993 | 2,407,154
Number of stock awards granted |  | 357,639 |
Number of stock awards vested |  | 1,193,033 | 1,363,548
Number of stock awards forfeited |  | 62,955 |
Number of stock awards distributed |  | 687,844 |
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
Equity compensation expense | $ | $ 600 |  |
Number of executives departed | executive | 2 |  |
Share-based compensation, vesting period |  | 3 years |
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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