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Equity Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2023 | Dec. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 37,605 | $ 40,188 |  |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  | 2 years |  |  |
Long-term incentive award expense |  |  |  |  | $ 24,854 | $ 23,101 | $ 19,938 |
Performance-based valuation adjustment |  |  |  |  | $ 4,553 |  |  |
Cash Settled Performance Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value assumptions, volatility rate |  |  |  |  | 71.00% |  |  |
Grant date fair value assumptions, risk-free rate |  |  |  |  | 4.23% |  |  |
Grant date fair value assumptions, dividend yield |  |  |  |  | 0.00% |  |  |
Cash Settled Performance Stock Units | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity awards, vesting percentage |  |  |  |  | 100.00% |  |  |
Redwood Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Additional common stock grant (in shares) |  |  |  | 9,650,000 |  |  |  |
Shares of common stock available for grant under Redwood's Incentive Plan (in shares) |  |  |  |  | 10,211,459 | 2,896,604 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 0 | $ 0 |  |
Share of common stock authorized (in shares) |  |  |  |  | 850,000 |  |  |
Performance-based valuation adjustment |  |  |  |  | $ 0 |  |  |
Share purchased (in shares) |  |  |  |  | 763,369 |  |  |
Executive Deferred Compensation 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) |  |  |  |  | 169,969 |  |  |
Number of additional shares authorized (in shares) | 100,000 |  |  |  |  |  |  |
Restricted Stock Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Long-term incentive award expense |  |  |  |  | $ 0 | $ 100 | $ 500 |
Number of stock awards granted (in shares) |  |  |  |  | 0 | 0 | 0 |
Number of stock awards forfeited (in shares) |  |  |  |  | 0 | 341 | 0 |
Granted (in dollars per share) |  |  |  |  | $ 0 | $ 0 | $ 0 |
Number of stock awards vested (in shares) |  |  |  |  | 0 | 27,800 | 50,857 |
Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 3,000 |  |  |
Weighted average amortization period remaining for equity awards (in years) |  |  |  |  | 2 years |  |  |
Long-term incentive award expense |  |  |  |  | $ 3,000 | $ 3,000 | $ 2,000 |
Share-based compensation, vesting period (in years) |  |  |  |  | 4 years |  |  |
Number of stock awards granted (in shares) |  |  |  |  | 275,005 | 558,388 | 272,261 |
Number of stock awards forfeited (in shares) |  |  |  |  | 132,741 | 48,915 | 45,343 |
Granted (in dollars per share) |  |  |  |  | $ 7.88 | $ 8.38 | $ 8.80 |
Number of stock awards vested (in shares) |  |  |  |  | 354,813 | 134,426 | 78,270 |
Restricted Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 3,166 | $ 5,068 |  |
Performance-based valuation adjustment |  |  |  |  | 0 |  |  |
Deferred Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | 19,000 |  |  |
Long-term incentive award expense |  |  |  |  | $ 11,000 | $ 13,000 | $ 9,000 |
Share-based compensation, vesting period (in years) |  |  |  |  | 4 years |  |  |
Unvested outstanding stock awards (in units) |  |  |  |  | 2,536,692 | 2,335,551 |  |
Weighted-average grant date fair value of stock awards (in dollars per unit) |  |  |  |  | $ 9.05 | $ 10.74 |  |
Number of stock awards granted (in shares) |  |  |  |  | 1,499,621 | 1,759,344 | 1,588,862 |
Number of stock awards forfeited (in shares) |  |  |  |  | 50,121 | 398,693 | 31,161 |
Granted (in dollars per share) |  |  |  |  | $ 7.77 | $ 8.83 | $ 12.04 |
Deferred Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 18,920 | $ 19,849 |  |
Performance-based valuation adjustment |  |  |  |  | 0 |  |  |
Performance Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 16,000 |  |  |
Long-term incentive award expense |  |  |  |  |  | $ 4,000 | $ 3,000 |
Share-based compensation, vesting period (in years) |  |  |  |  | 3 years |  |  |
Unvested outstanding stock awards (in units) |  |  |  |  | 3,072,039 | 2,354,002 |  |
Number of stock awards granted (in shares) |  |  |  |  | 993,868 | 1,086,153 |  |
Number of stock awards forfeited (in shares) |  |  |  |  | 0 | 0 |  |
BvTSR for tranche (as a percent) |  |  |  |  | 25.00% | 7.70% |  |
Adjustment to stock-based compensation |  |  |  |  |  |  | $ 1,000 |
Performance Stock Units | Redwood Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 15,519 | $ 15,271 |  |
Share-based compensation, vesting period (in years) |  |  |  |  |  | 1 year |  |
Performance-based valuation adjustment |  |  |  |  | $ 4,553 | $ 3,000 |  |
Performance Stock Units | Performance Share Units (PSUs), 2022 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average grant date fair value of stock awards (in dollars per unit) |  |  |  |  | $ 8.81 | $ 9.09 |  |
Vesting percentage if TSR is 25% |  |  |  |  | 100.00% |  |  |
Stock price valuation period |  |  |  |  |  | 60 days |  |
Grant date fair value assumptions, volatility rate |  |  |  |  | 35.85% | 69.00% |  |
Grant date fair value assumptions, risk-free rate |  |  |  |  | 4.04% | 3.91% |  |
Grant date fair value assumptions, dividend yield |  |  |  |  |  | 0.00% |  |
TSR performance period (in years) |  |  |  |  | 3 years | 3 years |  |
Performance Stock Units | Performance Share Units (PSUs), 2021 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) |  |  |  |  | $ 15.68 |  |  |
Grant date fair value assumptions, volatility rate |  |  |  |  | 59.00% |  |  |
Grant date fair value assumptions, risk-free rate |  |  |  |  | 0.98% |  |  |
Grant date fair value assumptions, dividend yield |  |  |  |  | 0.00% |  |  |
TSR performance period (in years) |  |  |  |  | 3 years |  |  |
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) |  |  |  |  |  | $ 10.42 |  |
Grant date fair value assumptions, volatility rate |  |  |  |  |  | 54.00% |  |
Grant date fair value assumptions, risk-free rate |  |  |  |  |  | 0.18% |  |
Grant date fair value assumptions, dividend yield |  |  |  |  |  | 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] |  |  |  |  |  |  |  |
Stock price valuation period |  |  |  |  |  |  | 60 days |
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) |  |  |  |  | 560,000 |  | 518,173 | 473,845
Relative increase/decrease in vesting percentage based on TSR |  |  |  |  | 5000.00% |  |  |
Vesting percentage cap if first 2 steps yield a vesting level greater than 100% |  |  | 100.00% |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, vesting period (in years) |  |  |  |  | 3 years |  |  |
Minimum | Cash Settled Performance Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity awards, vesting percentage |  |  |  |  | 0.00% |  |  |
Minimum | Performance Stock Units | Performance Share Units (PSUs), 2022 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 0.00% |  |  |
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% |  |  |
Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation, vesting period (in years) |  |  |  |  | 4 years |  |  |
Maximum | Cash Settled Performance Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity awards, vesting percentage |  |  |  |  | 250.00% |  |  |
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 | Redwood Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 75.00% |  |
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2022 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 250.00% |  |  |
Maximum | Performance Stock Units | Performance Share Units (PSUs), 2020 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  | 200.00% |  |  |  |  | 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% |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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