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Other Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Apr. 27, 2020
Dec. 31, 2019
Other Liabilities [Line Items]      
Accrued compensation and benefits $ 142,136   $ 136,645
Long term liabilities 141,910   146,297
Letter of credit   $ 200,000  
Fair value adjustment loss 7,200    
Maximum potential payment outcomes 286,200    
Other accrued expenses $ 121,758   128,835
Income tax examination, description The CARES Act (as further described in Note 15, Income Taxes) provides for deferred payment of the employer portion of social security taxes between March 27, 2020 and December 31, 2020, with 50% of the deferred amount due December 31, 2021 and the remaining 50% due December 31, 2022.    
Deferred tax liabilities $ 489,054   506,135
Accounts Payable [Member]      
Other Liabilities [Line Items]      
Deferred tax liabilities 24,000    
Other Long Term Liabilities [Member]      
Other Liabilities [Line Items]      
Deferred tax liabilities 24,000    
Surety Bond [Member]      
Other Liabilities [Line Items]      
liabilities for unpaid claims and adjustments expense 7,500    
Letter of Credit [Member]      
Other Liabilities [Line Items]      
Letter of credit 60,700   63,500
Unsecured Loan [Member]      
Other Liabilities [Line Items]      
Other accrued expenses 4,000    
Worker's Compensation Programs [Member]      
Other Liabilities [Line Items]      
Unpaid liability 56,200   55,900
Accrued compensation and benefits 25,600   26,200
Long term liabilities $ 30,600   $ 29,700