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Equity Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 43,968 | $ 42,383 |
Weighted average amortization period remaining for equity awards | 2 years |  |
Shares of common stock to be purchased in aggregate for all employees (in shares) | 850,000 | 850,000 |
Number of shares purchased by employees (in shares) | 586,762 | 569,728 |
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 1,551 | 28,141 |
Number of stock awards granted (in shares) | 0 |  |
Number of stock awards vested (in shares) | 26,249,000 |  |
Number of stock awards forfeited (in shares) | 341 |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 498,223 | 431,072 |
Number of stock awards granted (in shares) | 206,179,000 |  |
Number of stock awards vested (in shares) | 117,725,000 |  |
Number of stock awards forfeited (in shares) | 21,303,000 |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 4,526,420 | 4,022,088 |
Number of stock awards granted (in shares) | 645,870,000 |  |
Number of stock awards vested (in shares) | 1,965,990 |  |
Stock units distributed (in shares) | 141,538,000 |  |
Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) | 1,267,849 | 1,473,883 |
Number of stock awards granted (in shares) |  |  | 206,034
Share-based compensation, vesting period (in years) | 3 years |  |
Redwood Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock available for grant (in shares) | 5,708,420 | 5,958,390 |
Redwood Incentive Plan | Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 13 | $ 84 |
Redwood Incentive Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | 5,360 | 3,589 |
Redwood Incentive Plan | Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | 27,374 | 26,473 |
Redwood Incentive Plan | Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 10,979 | $ 12,237 |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://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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