Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 477,915	$ 467,079	$ 945,513	$ 923,377
Operating Segments | Total occupational health center revenue
Disaggregation of Revenue [Line Items]
Revenue	451,240	441,774	892,312	872,890
Operating Segments | Onsite clinics
Disaggregation of Revenue [Line Items]
Revenue	15,539	14,705	31,396	29,250
Operating Segments | Other
Disaggregation of Revenue [Line Items]
Revenue	11,136	10,600	21,805	21,237
Workers’ compensation
Disaggregation of Revenue [Line Items]
Revenue	288,405	278,554	568,271	546,894
Employer services
Disaggregation of Revenue [Line Items]
Revenue	153,305	153,164	304,040	305,337
Consumer health
Disaggregation of Revenue [Line Items]
Revenue	7,669	7,802	15,995	15,987
Other occupational health center revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 1,861	$ 2,254	$ 4,006	$ 4,672