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Share-Based Compensation - Summary of the Option Unit Activity (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
2021 Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, grant outstanding beginning balance	0
Number of units, exchange for options in the company	3,222,790
Number of units, grant outstanding ending balance	3,222,790	3,222,790
Number of units, vested	343,926	343,926
Number of units, unvested	2,878,864	2,878,864
Weighted average exercise price, grant outstanding beginning balance	$ 0
Weighted average exercise price, issued in exchange for options in the company's parent	15.00
Weighted average exercise price, grant outstanding ending balance	15.00	$ 15.00
Weighted average exercise price, grants vested	15.00	15.00
Weighted average exercise price, grants unvested	$ 15.00	$ 15.00
First Advantage Corporation [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, grant outstanding beginning balance		0
Number of units, exercised		(28,262)
Number of units, forfeited		(283,816)
Number of units, exchange for options in the company		3,938,491
Number of units, grant outstanding ending balance	3,626,413	3,626,413
Number of units, vested	349,018	349,018
Number of units, unvested	3,277,395	3,277,395
Weighted average exercise price, grant outstanding beginning balance		$ 0
Weighted average exercise price, issued in exchange for options in the company's parent		6.65
Weighted average exercise price, exercised		6.61
Weighted average exercise price, forefeited		6.61
Weighted average exercise price, grant outstanding ending balance	$ 6.63	6.63
Weighted average exercise price, grants vested	6.61	6.61
Weighted average exercise price, grants unvested	$ 6.63	$ 6.63
Fastball Holdco L P [Member] | Class B Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, grant outstanding beginning balance		2,733,734
Number of units, exercised		(24,112)
Number of units, forfeited		(107,168)
Number of units, exchange for options in the company		(2,602,454)
Number of units, grant outstanding ending balance	0	0
Weighted average exercise price, grant outstanding beginning balance		$ 10.06
Weighted average exercise price, exercised		10.00
Weighted average exercise price, forefeited		10.00
Weighted average exercise price, exchanged for options		$ 10.07

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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