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Long-term debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior notes $ 4,500,000 $ 4,500,000
Acquisition obligations and other notes payable 151,167 150,512
Capital lease obligations 304,062 297,170
Total debt principal outstanding 9,525,979 9,400,182
Discount and deferred financing costs (61,958) (63,951)
Total amount of long-term debt 9,464,021 9,336,231
Less current portion (184,136) (178,213)
Long-term debt 9,279,885 9,158,018
Term Loan A    
Debt Instrument [Line Items]    
Senior Secured Credit Facilities 750,000 775,000
Term Loan A-2    
Debt Instrument [Line Items]    
Senior Secured Credit Facilities 452,000 0
Term Loan B    
Debt Instrument [Line Items]    
Senior Secured Credit Facilities 3,368,750 3,377,500
Revolver    
Debt Instrument [Line Items]    
Senior Secured Credit Facilities $ 0 $ 300,000