Stockholders' Equity - Additional Information (Details)		3 Months Ended	12 Months Ended
	Mar. 06, 2023 $ / shares shares	Mar. 31, 2023 USD ($) Vote $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Aug. 01, 2022 USD ($) $ / shares	Jul. 02, 2021 shares
Class Of Stock [Line Items]
Preferred stock, authorized		1,000,000.0	1,000,000.0
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 | $		$ 194,000,000
Additional paid-in-capital deferred tax assets | $		18,000,000
Common stock repurchase, authorized amount | $				$ 100,000,000
Remaining authorized amount for future share repurchase program | $		78,000,000
Tax Receivable Agreement Liability
Class Of Stock [Line Items]
Additional TRA liabilities | $		$ 67,000,000	$ 43,000,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		497,234,220	478,300,000
Common stock, shares outstanding		497,234,220	478,300,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, shares authorized		1,000,000,000.0	1,000,000,000.0
Conversion of stock		19,345,591
Number of shares repurchased		1,148,435
Total cost | $		$ 10,000,000
Class A Common Stock | Secondary Offering
Class Of Stock [Line Items]
Number of shares issued	46,000,000
Public offering price | $ / shares	$ 9.00
Number of days option to underwriter to purchase additional common shares	30 days
Class A Common Stock | Over-Allotment Option
Class Of Stock [Line Items]
Number of shares issued	6,900,000
Unvested Class A common stock
Class Of Stock [Line Items]
Common stock, shares outstanding		6,992,844
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		10,000,000.0	10,000,000.0
Common stock, shares outstanding		10,000,000.0	10,000,000.0
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Issuance of common units		14,999,998
Common stock, shares authorized		20,000,000.0	20,000,000.0
Unvested Common Class B
Class Of Stock [Line Items]
Issuance of employee compensation		764,301
Class B-1 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		4,990,453
Common stock, shares outstanding		4,990,453
Common stock shares related to employee compensation, unvested		382,151
Common stock conversion, description		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 Units | Alight Holdings
Class Of Stock [Line Items]
Common stock, shares issued		2,509,546
Common stock, shares outstanding		2,509,546
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 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-2 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		4,990,453
Common stock, shares outstanding		4,990,453
Common stock shares related to employee compensation, unvested		382,151
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		2,509,546
Common stock, shares outstanding		2,509,546
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		44,135,874	63,500,000
Common stock, shares outstanding		44,135,874	63,500,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock shares conversion ratio		1
Common stock, shares authorized		175,000,000.0	175,000,000.0
Common shares, votes per share | Vote		1
Shares, outstanding		44,135,874	63,481,465
Conversion of stock		(19,345,591)
Class Z Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		5,197,081	5,200,000		8,671,507
Common stock, shares outstanding		5,197,081	5,200,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, shares authorized		12,900,000	12,900,000
Shares, outstanding		5,197,081	5,595,577
Class Z-A Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		4,663,187
Common stock, shares outstanding		4,663,187
Class Z-B-1 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		266,947
Common stock, shares outstanding		266,947
Class Z-B-2 Common Stock
Class Of Stock [Line Items]
Common stock, shares issued		266,947
Common stock, shares outstanding		266,947
Class Z Common Units
Class Of Stock [Line Items]
Common stock, shares issued		2,856,875
Common stock, shares outstanding		2,856,875
Class Z-A Common Units
Class Of Stock [Line Items]
Common stock, shares issued		2,563,387
Common stock, shares outstanding		2,563,387
Class Z-B-1 Common Units
Class Of Stock [Line Items]
Common stock, shares issued		146,744
Common stock, shares outstanding		146,744
Class Z-B-2 Common Units
Class Of Stock [Line Items]
Common stock, shares issued		146,744
Common stock, shares outstanding		146,744
Class A Units
Class Of Stock [Line Items]
Common stock, shares outstanding		541,370,094
Shares, outstanding		497,234,220
Held by non controlling interest		44,135,874