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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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