Segment and Geographic Location Information - Components of Segment Revenues and Adjusted EBITDA (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Segment Revenues	$ 167,937	$ 130,312		$ 458,466	$ 404,902
Segment Adjusted EBITDA	23,303	18,373	[1]	61,097	51,337	[1]
Discontinuing Specialty Lab
Segment Reporting Information [Line Items]
Segment Revenues	$ 2,000	3,900		$ 5,900	12,900
Segment Adjusted EBITDA		(500)			(100)
Start-up Losses and Investment in New Services
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA		$ 1,300			$ 2,900

[1] Includes the add back of start-up losses and investment in new services of $1.3 million and $2.9 million for the three and nine months ended September 30, 2022, respectively.