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Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2018
Sep. 30, 2018
Health Insurance Costs [Abstract]            
Percentage of our health insurance coverage provided by United 87.00%          
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   $ 9,000      
Required deposit equal to approximately one day of claims funding activity 6,500          
Amount which plan costs were less than the net premiums paid and owed 36,800          
Prepaid health insurance, current 27,800          
Premiums owed to United 40,700          
Benefits costs incurred (reduced) related to run-off 1,500 $ 300        
Workers' Compensation Costs [Abstract]            
Company's maximum economic burden for the first layer of claims per occurrence 1,000     $ 1,500    
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 $ 10,100 $ 7,800        
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 1.00% 2.50%        
Incurred but not paid workers compensation liabilities [Abstract]            
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments     242,904   $ 229,639  
Workers' Compensation Expense $ 14,339 $ 15,787        
Present value discount (200) (1,689)        
Paid claims (11,121) (12,409)        
WorkersCompensationLiabilityNetOfAdminFeesCurrent 48,289 44,704        
Long-term portion of accrued claims 197,633 186,624 193,609      
Ending balance 245,922 231,328        
Workers compensation administrative fees accrued 4,000          
Undiscounted accrued workers' compensation costs $ 265,600 250,200        
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, a long-term asset Greater than 1 year          
Restricted cash $ 48,349   49,295   42,227 $ 44,705
Deposits workers compensation $ 188,549   175,913   $ 166,474 $ 170,905
Time period estimate of incurred claim costs to be paid included in short-term liabilities 1 year          
Time period incurred claims expected to be paid, included in long-term liabilities Greater than 1 year          
Revenue from Contract with Customer [Abstract]            
Unbilled $ 509,300   $ 448,100      
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 1,229,483 1,153,010        
Northeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 344,086 310,945        
Southeast [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 140,678 129,906        
Central [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 211,302 195,753        
Southwest [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 272,130 269,832        
West [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax 246,853 233,204        
Other Revenues [Member]            
Disaggregation of Revenue [Line Items]            
Revenue from Contract with Customer, Excluding Assessed Tax $ 14,434 $ 13,370