Stockholders' Equity - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) Vote $ / shares shares	Mar. 20, 2024 USD ($)	Dec. 31, 2023 $ / shares shares	Aug. 01, 2022 USD ($) $ / shares	Jul. 02, 2021 shares
Class Of Stock [Line Items]
Preferred stock, authorized	1,000,000		1,000,000
Preferred stock, par value | $ / shares	$ 0.0001		$ 0.0001
Preferred stock, issued	0		0
Preferred stock, outstanding	0		0
Common stock, par value | $ / shares				$ 0.0001
Increase in equity | $	$ 264,000,000
Additional paid-in-capital deferred tax liabilities | $	20,000,000
Common stock repurchase, authorized amount | $				$ 100,000,000
Remaining authorized amount for future share repurchase program | $	248,000,000	$ 248,000,000
Tax Receivable Agreement Liability
Class Of Stock [Line Items]
Additional TRA liabilities | $	$ 85,000,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	549,961,741		510,900,000
Common stock, shares outstanding	549,961,741		510,900,000
Common stock, par value | $ / shares	$ 0.0001		$ 0.0001
Common stock, shares authorized	1,000,000,000		1,000,000,000
Conversion of stock	27,773,062
Number of shares repurchased	0
Remaining authorized amount for future share repurchase program | $		$ 200,000,000
Unvested Class A common stock
Class Of Stock [Line Items]
Common stock, shares issued	712,237
Common stock, shares outstanding	712,237
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	9,900,000		9,900,000
Common stock, shares outstanding	9,900,000		9,900,000
Common stock, par value | $ / shares	$ 0.0001		$ 0.0001
Issuance of common units	14,999,998
Common stock, shares authorized	20,000,000		20,000,000
Unvested Common Class B
Class Of Stock [Line Items]
Issuance of employee compensation	312,208
Class B-1 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	4,933,087
Common stock, shares outstanding	4,933,087
Common stock shares related to employee compensation, unvested	156,104
Common stock conversion, description	Shares of Class B-1 Common Stock vest and automatically convert into shares of Class A Common Stock on a 1-for-1 basis if the volume weighted average price (“VWAP”) of the shares of Class A Common Stock equals or exceeds $12.50 per share for 20 or more trading days within a consecutive 30-trading day period (or in the event of a change of control or liquidation event that implies a $12.50 per share valuation on a diluted basis).
Common stock shares conversion ratio	1
Common stock shares convertible stock price trigger | $ / shares	$ 12.50
Common stock shares convertible threshold trading days	20 days
Common stock shares convertible threshold consecutive trading days	30 days
Common stock shares convertible stock valuation price on diluted basis | $ / shares	$ 12.50
Class B-1 Common Stock | Alight Holdings
Class Of Stock [Line Items]
Common stock shares convertible threshold trading days	20 days
Class B-1 Common Units | Alight Holdings
Class Of Stock [Line Items]
Common stock, shares issued	2,566,912
Common stock, shares outstanding	2,566,912
Common stock conversion, description	Class B-1 common units vest and automatically convert into Class A common units of Alight Holdings on a 1-for-1 basis if the VWAP of the shares of Class A Common Stock equals or exceeds $12.50 per share for 20 or more trading days within a consecutive 30-trading day period (or in the event of a change of control or liquidation event that implies a $12.50 per share valuation on a diluted basis).
Common stock shares conversion ratio	1
Common stock shares convertible stock price trigger | $ / shares	$ 12.50
Common stock shares convertible threshold consecutive trading days	30 days
Common stock shares convertible stock valuation price on diluted basis | $ / shares	$ 12.50
Class B-2 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	4,933,087
Common stock, shares outstanding	4,933,087
Common stock shares related to employee compensation, unvested	156,104
Common stock conversion, description	Class B-2 Common Stock vest and automatically convert into shares of Class A Common Stock on a 1-for-1 basis if the VWAP of the shares of Class A Common Stock equals or exceeds $15.00 per share for 20 or more trading days within a consecutive 30-trading day period (or in the event of a change of control or liquidation event that implies a $15.00 per share valuation on a diluted basis).
Common stock shares conversion ratio	1
Common stock shares convertible stock price trigger | $ / shares	$ 15.00
Common stock shares convertible threshold trading days	20 days
Common stock shares convertible threshold consecutive trading days	30 days
Common stock shares convertible stock valuation price on diluted basis | $ / shares	$ 15.00
Class B-2 Common Units | Alight Holdings
Class Of Stock [Line Items]
Common stock, shares issued	2,566,912
Common stock, shares outstanding	2,566,912
Common stock conversion, description	Class B-2 common units vest and automatically convert into Class A common units of Alight Holdings on a 1-for-1 basis if the VWAP of the shares of Class A Common Stock equals or exceeds $15.00 per share for 20 or more trading days within a consecutive 30-trading day period (or in the event of a change of control or liquidation event that implies a $15.00 per share valuation on a diluted basis).
Common stock shares conversion ratio	1
Common stock shares convertible stock price trigger | $ / shares	$ 15.00
Common stock shares convertible threshold trading days	20 days
Common stock shares convertible threshold consecutive trading days	30 days
Common stock shares convertible stock valuation price on diluted basis | $ / shares	$ 15.00
Class B-3 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	0
Common stock, shares outstanding	0
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares authorized	10,000,000
Class V Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	1,200,000		29,000,000
Common stock, shares outstanding	1,200,000		29,000,000
Common stock, par value | $ / shares	$ 0.0001		$ 0.0001
Common stock shares conversion ratio	1
Common stock, shares authorized	175,000,000		175,000,000
Shares issued	1,189,156
Common shares, votes per share | Vote	1
Shares, outstanding	1,189,156		28,962,218
Conversion of stock	(27,773,062)
Class Z Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	578,099		3,400,000		8,671,507
Common stock, shares outstanding	578,099		3,400,000
Common stock, par value | $ / shares	$ 0.0001		$ 0.0001
Common stock, shares authorized	12,900,000		12,900,000
Shares, outstanding	578,099		3,420,215
Class Z-A Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	376,637
Common stock, shares outstanding	376,637
Class Z-B-1 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	100,731
Common stock, shares outstanding	100,731
Class Z-B-2 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued	100,731
Common stock, shares outstanding	100,731
Class Z Common Units
Class Of Stock [Line Items]
Common stock, shares issued	317,783
Common stock, shares outstanding	317,783
Class Z-A Common Units
Class Of Stock [Line Items]
Common stock, shares issued	207,039
Common stock, shares outstanding	207,039
Class Z-B-1 Common Units
Class Of Stock [Line Items]
Common stock, shares issued	55,372
Common stock, shares outstanding	55,372
Class Z-B-2 Common Units
Class Of Stock [Line Items]
Common stock, shares issued	55,372
Common stock, shares outstanding	55,372
Class A Units
Class Of Stock [Line Items]
Common stock, shares outstanding	551,150,897
Shares, outstanding	549,961,741
Held by non controlling interest	1,189,156