Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,900,192	$ 1,838,081	$ 1,724,359
Workers’ compensation
Disaggregation of Revenue [Line Items]
Revenue	1,156,082	1,102,313	1,012,760
Employer services
Disaggregation of Revenue [Line Items]
Revenue	596,052	594,223	562,526
Consumer health
Disaggregation of Revenue [Line Items]
Revenue	31,519	31,194	27,523
Other occupational health center revenue
Disaggregation of Revenue [Line Items]
Revenue	8,752	8,284	27,146
Total occupational health center revenue
Disaggregation of Revenue [Line Items]
Revenue	1,792,405	1,736,014	1,629,955
Onsite health clinics
Disaggregation of Revenue [Line Items]
Revenue	64,081	60,181	55,995
Other Businesses
Disaggregation of Revenue [Line Items]
Revenue	$ 43,706	$ 41,886	$ 38,409