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Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 01, 2019
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]            
Unbilled $ 810,000 $ 669,000        
Disaggregation of Revenue [Line Items]            
Revenues 6,581,000 6,486,000 $ 5,939,000      
Revenue Composition [Abstract]            
Gross billings 43,752,000 43,141,000 40,127,000      
Worksite employee payroll cost 37,171,000 36,655,000 34,188,000      
Revenues $ 6,581,000 6,486,000 5,939,000      
Health Insurance Costs [Abstract]            
Percentage of our health insurance coverage provided by United 86.00%          
Number of days in advance of the beginning of a reporting quarter United establishes cash funding rates 90 days          
Required accumulated cash surplus $ 9,000          
Required deposit equal to approximately one day of claims funding activity 7,000          
Prepaid health insurance, current (5,000)          
Amount which plan costs were less than the net premiums paid and owed (14,000)          
Premiums owed to United 1,000          
Benefits costs incurred (reduced) related to run-off (29,000) (13,000)        
Workers' Compensation Costs [Abstract]            
Company's maximum economic burden for the first layer of claims per occurrence         $ 1,500 $ 1,000
Company's maximum aggregate economic burden for claims in excess of 1 million per policy year         $ 6,000 $ 6,000
Decrease Increase in accrued workers' compensation costs for changes in estimated losses $ (32,000) (33,000)        
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 4.30%          
Incurred but not paid workers compensation liabilities [Abstract]            
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments   220,000 229,000      
Workers' Compensation Expense $ 65,000 61,000        
Workers' Compensation Discount, Changed during period (12,000) (13,000)        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (69,000) (57,000)        
Workers' Compensation Liability 204,000 220,000        
WorkersCompensationLiabilityNetOfAdminFeesCurrent 69,000 57,000        
Workers' Compensation Liability, Noncurrent 135,000 163,000        
Workers' Compensation Liability 204,000 220,000        
Workers compensation administrative fees accrued 2,000 3,000        
Undiscounted accrued workers' compensation costs $ 240,000 250,000        
Time period incurred claims expected to be paid recorded as restricted cash 1 year          
Time period incurred claims expected to be paid included in deposits Greater than 1 year          
ReturnOfExcessClaimFunds $ 39,000          
Restricted cash 69,000 57,000 50,000 $ 47,000    
Deposits workers compensation 178,000 198,000 196,000 $ 185,000    
WorkersCompDepositsHeldInTrust $ 241,000          
Time period estimate of incurred claim costs to be paid included in short-term liabilities 1 year          
Time period estimate of incurred claim costs to be paid included in long term liabilities Greater than 1 year          
Northeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenues $ 1,801,000 1,757,000 1,625,000      
Revenue Composition [Abstract]            
Revenues 1,801,000 1,757,000 1,625,000      
Southeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenues 926,000 907,000 796,000      
Revenue Composition [Abstract]            
Revenues 926,000 907,000 796,000      
Central [Member]            
Disaggregation of Revenue [Line Items]            
Revenues 1,195,000 1,170,000 1,045,000      
Revenue Composition [Abstract]            
Revenues 1,195,000 1,170,000 1,045,000      
Southwest [Member]            
Disaggregation of Revenue [Line Items]            
Revenues 1,245,000 1,250,000 1,163,000      
Revenue Composition [Abstract]            
Revenues 1,245,000 1,250,000 1,163,000      
West [Member]            
Disaggregation of Revenue [Line Items]            
Revenues 1,344,000 1,337,000 1,251,000      
Revenue Composition [Abstract]            
Revenues 1,344,000 1,337,000 1,251,000      
Other Revenues [Member]            
Disaggregation of Revenue [Line Items]            
Revenues 70,000 65,000 59,000      
Revenue Composition [Abstract]            
Revenues $ 70,000 $ 65,000 $ 59,000