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Significant Accounting and Reporting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Classofstock
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]      
Number of countries in which entity operates (more than) 70    
Number of classes of common stock | Classofstock 2    
Deferred compensation plan liabilities $ 6,248,000 $ 6,261,000  
Assets held in the related rabbi trust 10,389,000 10,237,000  
Revenue before reimbursements 1,340,970,000 1,316,919,000 $ 1,231,226,000
Depreciation 8,881,000 10,004,000 11,941,000
Self insurance reserve 47,061,000 51,746,000  
Self-insured risks 27,813,000 33,238,000  
Reinsurance recoverable assets 20,651,000 30,323,000  
Foreign currency transaction gain (loss) (65,000) (691,000) (1,259,000)
Advertising expense 2,132,000 2,143,000 1,939,000
Capitalized software      
Variable Interest Entity [Line Items]      
Implementation of hosting arrangement service contracts 5,900,000 5,000,000  
Amortization of intangible assets 19,817,000 17,948,000 $ 16,320,000
Outside the US      
Variable Interest Entity [Line Items]      
Time deposits, at carrying value $ 55,000 $ 328,000  
Class A Non-Voting      
Variable Interest Entity [Line Items]      
Approval rate to waive equal consideration rights 75.00%