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Long-term debt (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
Long-term debt (Detail) - USD ($) $ in Thousands	May 06, 2019	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Dec. 24, 2019
Senior Notes
Acquisition obligations and other notes payable		$ 184,170	$ 184,170	$ 183,979
Finance Lease, Liability		$ 277,580	$ 277,580	282,737
Debt Instrument, Interest Rate During Period		5.17%	5.16%
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.30%	5.30%
Total debt principal outstanding		$ 9,003,631	$ 9,003,631	10,154,216
Discount and deferred financing costs		(34,502)	(34,502)	(52,000)
Total amount of long-term debt		8,969,129	8,969,129	10,102,216
Less current portion		(3,591,331)	(3,591,331)	(1,929,369)
Long-term debt		5,377,798	$ 5,377,798	8,172,847
Debt Instrument, table footnotes
Long-Term Debt Maturity Extension Term	6 months
Debt Instrument, Maturity Date			Dec. 24, 2019
Senior Notes Five Point Seven Five Percentage Senior Notes Due Twenty Twenty Two
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Aug. 15, 2022
Debt Instrument, Fair Value Disclosure		1,264,000	$ 1,264,000
Senior Notes
Senior Notes		1,250,000	$ 1,250,000	1,250,000
Debt Instrument, Interest Rate During Period			5.75%
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Aug. 15, 2022
Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Jul. 15, 2024
Debt Instrument, Fair Value Disclosure		1,748,250	$ 1,748,250
Senior Notes
Senior Notes		1,750,000	$ 1,750,000	1,750,000
Debt Instrument, Interest Rate During Period			5.125%
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Jul. 15, 2024
Senior Notes Five Point Zero Percent Due Twenty Twenty Five
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			May 01, 2025
Debt Instrument, Fair Value Disclosure		1,479,000	$ 1,479,000
Senior Notes
Senior Notes		$ 1,500,000	$ 1,500,000	1,500,000
Debt Instrument, Interest Rate During Period			5.00%
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			May 01, 2025
Notes Payable, Other Payables
Senior Notes
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.70%	5.70%
Debt Instrument, Maturity Date, Description			2019-2027
Finance Lease
Senior Notes
Finance Lease, Weighted Average Discount Rate, Percent		5.43%	5.43%
Debt Instrument, Maturity Date, Description			2019-2036
Senior Secured Credit Facilities
Senior Notes
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.31%	5.31%
Debt Instrument, table footnotes
Debt Instrument, Unamortized Discount		$ 696	$ 696	6,104
Deferred Offering Costs		3,744	3,744	12,580
Senior Notes
Debt Instrument, table footnotes
Deferred Offering Costs		30,062	30,062	33,316
Term Loan A
Debt Instrument [Line Items]
Senior Secured Credit Facilities		64,383	$ 64,383	675,000
Debt Instrument, Description of Variable Rate Basis			2.00% + LIBOR
Debt Instrument, Maturity Date			Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		64,300	$ 64,300
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Dec. 24, 2019
Term Loan A-2
Debt Instrument [Line Items]
Senior Secured Credit Facilities		102,498	$ 102,498	995,000
Debt Instrument, Description of Variable Rate Basis			1.00% + LIBOR
Debt Instrument, Maturity Date			Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		103,011	$ 103,011
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Dec. 24, 2019
Term Loan B
Debt Instrument [Line Items]
Senior Secured Credit Facilities		3,325,000	$ 3,325,000	3,342,500
Debt Instrument, Description of Variable Rate Basis			2.75% + LIBOR
Debt Instrument, Maturity Date			Jun. 24, 2021
Debt Instrument, Fair Value Disclosure		3,333,313	$ 3,333,313
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Jun. 24, 2021
Revolver
Debt Instrument [Line Items]
Senior Secured Credit Facilities		550,000	$ 550,000	$ 175,000
Debt Instrument, Description of Variable Rate Basis			2.00% + LIBOR
Debt Instrument, Maturity Date			Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		$ 550,000	$ 550,000
Debt Instrument, table footnotes
Debt Instrument, Maturity Date			Dec. 24, 2019
Minimum \| London Interbank Offered Rate (LIBOR) \| Term Loan B
Debt Instrument, table footnotes
LIBOR plus interest rate margin			0.75%