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Commitments and Contingencies - Insurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitment And Contingencies [Line Items]    
Insurance and other non-current liabilities $ 311,307 $ 404,560
Employer's Liability, Workers' Compensation, Auto Liability, General Liability and Group Health Care Claims    
Commitment And Contingencies [Line Items]    
Gross amount accrued for insurance claims 287,600 272,900
Insurance and other non-current liabilities 212,900 210,100
Related insurance recoveries/receivables 35,100 56,500
Related insurance recoveries/receivables included in prepaid expenses and other current assets 300 300
Related insurance recoveries/receivables included in other assets net 34,800 $ 56,200
Project Insurance Claim    
Commitment And Contingencies [Line Items]    
Insurance recoveries $ 95,500