Acquisitions - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Nov. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Dec. 31, 2021
Restructuring Cost And Reserve [Line Items]
Goodwill			$ 796,556	$ 793,892
March 2021 UK Acquisition [Member]
Restructuring Cost And Reserve [Line Items]
Goodwill		$ 3,100
Intangible assets		3,000
Cash, net of cash acquired		$ 7,600
Form I-9 Compliance [Member]
Restructuring Cost And Reserve [Line Items]
Cash consideration			19,087
Current assets			1,151
Liabilities assumed			325
Cash, net of cash acquired			$ 19,800
Corporate Screening Services, LLC [Member]
Restructuring Cost And Reserve [Line Items]
Goodwill	$ 22,200
Intangible assets	15,500
Customer list	$ 11,800
Intangible asset, estimated useful life	14 years
Current assets	$ 2,900
Liabilities assumed	$ 1,600
Business acquisition, Percentage acquired	100.00%
Cash, net of cash acquired	$ 39,400
Developed Technology [Member] | Corporate Screening Services, LLC [Member]
Restructuring Cost And Reserve [Line Items]
Intangible assets	$ 3,600
Intangible asset, estimated useful life	5 years