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Segment Information and Geographic Location Information - Components of Segment Revenues and Segment Adjusted EBITDA (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Segment Revenues $ 624,208 $ 544,416 $ 546,413
Segment Adjusted EBITDA 78,576 68,450 [1] 77,642 [1]
Discontinuing Specialty Lab      
Segment Reporting Information [Line Items]      
Segment Revenues $ 8,800 17,000 23,900
Segment Adjusted EBITDA   2,100 6,400
Start-up Losses and Investment in New Services      
Segment Reporting Information [Line Items]      
Segment Adjusted EBITDA   $ 2,300 $ 4,400
[1] Includes the add back of start-up losses and investment in new services of $2.3 million and $4.4 million for the year ended December 31, 2022 and 2021, respectively.