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Equity Compensation Plans - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2022 shares | Dec. 31, 2020 USD ($) $ / shares shares | May 31, 2020 | Dec. 31, 2018 | May 31, 2018 executive $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
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) |  |  |  |  |  |  | 43,225 |  |
Unrecognized compensation cost | $ |  | $ 27,664 |  |  |  | $ 27,664 | $ 42,383 | $ 27,664 |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  |  |  | 2 years |  |
Long-term incentive award expense | $ |  |  |  |  |  |  | $ 19,938 | $ 12,439 | $ 13,402
Shares of common stock to be purchased in aggregate for all employees (in shares) |  |  |  |  |  |  | 850,000 |  |
Number of shares purchased by employees (in shares) |  |  |  |  |  |  | 569,728 |  |
Number of additional shares authorized |  |  |  |  |  |  |  |  | 200,000
Redwood Incentive Plan |  |  |  |  |  |  |  |  |
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) |  | 7,957,891 |  |  |  | 7,957,891 | 5,958,390 | 7,957,891 |
Restricted Stock Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 100 |  |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  |  |  | 1 year |  |
Long-term incentive award expense | $ |  |  |  |  |  |  |  | $ 500 | $ 2,000
Number of stock awards granted (in shares) |  |  |  |  |  |  | 0 | 0 | 0
Number of stock awards forfeited (in shares) |  |  |  |  |  |  | 0 | 34,857 | 0
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Number of stock awards vested (in shares) |  |  |  |  |  |  | 50,857 | 102,615 | 118,136
Restricted Stock Awards | Redwood Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 564 |  |  |  | $ 564 | $ 84 | $ 564 |
Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 4,000 |  |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  |  |  | 2 years |  |
Long-term incentive award expense | $ |  |  |  |  |  |  | $ 2,000 | $ 1,000 | $ 1,000
Number of stock awards granted (in shares) |  |  |  |  |  |  | 272,261 | 205,482 | 270,297
Number of stock awards forfeited (in shares) |  |  |  |  |  |  | 45,343 | 130,155 | 0
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 8.80 | $ 16.86 | $ 15.66
Number of stock awards vested (in shares) |  |  |  |  |  |  | 78,270 | 68,076 | 0
Restricted Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 3,540 |  |  |  | $ 3,540 | $ 3,589 | $ 3,540 |
Deferred Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | 26,000 |  |
Long-term incentive award expense | $ |  |  |  |  |  |  | $ 9,000 | $ 8,000 | $ 8,000
Unvested outstanding stock awards (in units) |  | 1,599,019 |  |  |  | 1,599,019 | 2,552,186 | 1,599,019 |
Weighted-average grant date fair value of stock awards (in dollars per unit) | $ / shares |  | $ 13.30 |  |  |  | $ 13.30 | $ 12.07 | $ 13.30 |
Number of stock awards granted (in shares) |  |  |  |  |  |  | 1,588,862 | 1,186,154 | 733,096
Number of stock awards forfeited (in shares) |  |  |  |  |  |  | 31,161 | 291,253 | 19,898
Share-based compensation, vesting period (in years) |  |  |  |  |  |  | 4 years |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 12.04 | $ 10.69 | $ 16.06
Deferred Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 17,766 |  |  |  | $ 17,766 | $ 26,473 | $ 17,766 |
Performance Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 12,000 |  |
Long-term incentive award expense | $ |  |  |  |  |  |  |  | $ 100 | $ 3,000
Unvested outstanding stock awards (in units) |  | 978,735 |  |  |  | 978,735 | 1,473,883 | 978,735 |
Weighted-average grant date fair value of stock awards (in dollars per unit) | $ / shares |  | $ 10.42 |  |  |  | $ 10.42 | $ 15.68 | $ 10.42 | $ 17.13
Number of stock awards granted (in shares) |  |  |  |  |  |  | 518,173 | 473,845 | 307,938
Number of stock awards forfeited (in shares) |  |  |  |  |  |  | 0 | 99,175 | 0
Share-based compensation, vesting period (in years) |  |  |  |  |  |  | 3 years |  |
BvTSR for tranche (as a percent) |  |  |  |  |  |  | 7.70% |  |
TSR performance period (in years) |  |  |  |  |  |  |  |  | 3 years
Adjustment to stock-based compensation | $ |  |  |  |  |  |  | $ 1,000 |  |
Performance Stock Units | Executives |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of stock awards granted (in shares) |  |  |  |  | 23,025 |  |  |  |
Stock price valuation period |  |  |  |  | 60 days |  |  |  |
Grant date fair value assumptions, volatility rate |  |  |  |  | 27.00% |  |  |  |
Grant date fair value assumptions, risk-free rate |  |  |  |  | 2.71% |  |  |  |
Grant date fair value assumptions, dividend yield |  |  |  |  | 0.00% |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 15.20 |  |  |  |
Number of executives granted PSUs in connection with promotions | executive |  |  |  |  | 2 |  |  |  |
Performance Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  | $ 5,794 |  |  |  | $ 5,794 | $ 12,237 | $ 5,794 |
Performance Stock Units | Performance Share Units (PSUs), 2020 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 15.68 | $ 10.42 |
Grant date fair value assumptions, volatility rate |  |  |  |  |  |  | 59.00% | 54.00% |
Grant date fair value assumptions, risk-free rate |  |  |  |  |  |  | 0.98% | 0.18% |
Grant date fair value assumptions, dividend yield |  |  |  |  |  |  | 0.00% | 0.00% |
TSR performance period (in years) |  |  |  |  |  |  | 3 years |  |
Performance Stock Units | Performance Share Units (PSUs), 2019 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 17.13 |
Stock price valuation period |  |  |  |  |  |  |  |  | 60 days
Grant date fair value assumptions, volatility rate |  |  |  |  |  |  |  | 15.00% |
Grant date fair value assumptions, risk-free rate |  |  |  |  |  |  |  | 1.68% |
Grant date fair value assumptions, dividend yield |  |  |  |  |  |  |  | 0.00% |
TSR performance period (in years) |  |  |  |  |  |  |  | 3 years |
Performance Stock Units | Performance Share Units (PSUs), 2018 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of stock awards granted (in shares) |  |  |  |  |  |  | 518,173 | 473,845 | 275,831
Vesting percentage if TSR is 25% |  |  |  |  |  |  | 100.00% |  |
BvTSR for tranche (as a percent) |  |  |  |  |  |  | 25.00% |  |
Relative increase/decrease in vesting percentage based on TSR |  |  |  |  |  |  | 50.00% |  |
Vesting percentage cap if first 2 steps yield a vesting level greater than 100% |  |  |  | 100.00% |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 17.23
Grant date fair value assumptions, volatility rate |  |  |  |  |  |  |  |  | 22.00%
Grant date fair value assumptions, risk-free rate |  |  |  |  |  |  |  |  | 2.78%
Grant date fair value assumptions, dividend yield |  |  |  |  |  |  |  |  | 0.00%
TSR performance period (in years) |  |  |  |  |  |  |  |  | 3 years
Performance Stock Units | Performance Share Units (PSUs), 2018 | Subsequent Event |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of stock awards granted (in shares) | 206,034 |  |  |  |  |  |  |  |
Performance Stock Units | Performance Share Units (PSUs), 2016 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of stock awards vested (in shares) |  |  |  |  |  | 222,769 |  |  |
Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation, vesting period (in years) |  |  | 4 years |  |  |  |  |  |
Maximum | Deferred Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  |  |  | 2 years |  |
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2020 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 200.00% |  |  |  |  |  |  |
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2018 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 250.00% |  |  |  |  |  |  |
First baseline vesting percentage |  |  |  | 200.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation, vesting period (in years) |  |  | 3 years |  |  |  |  |  |
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2020 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 0.00% |  |  |  |  |  |  |
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2018 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  | 0.00% |  |  |  |  |  |  |
First baseline vesting percentage |  |  |  | 0.00% |  |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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