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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	May 10, 2023	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 36.4
ESPP percentage	15.00%
Weighted Average Remaining Contractual Term, Grants Vested	1 year 3 months 18 days
Impact of Divided to stock option awards and ESPP purchases		$ 1.5
Employee stock purchase plan expenses	$ 0.2
2021 Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance			17,525,000
Share available for issuance	20,037,028
First Advantage Corporations [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, issued	0
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 16.2
Restricted Stock Agreements [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	12.1
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 8.1

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