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Long-term debt (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	9 Months Ended
Long-term debt (Detail) - USD ($) $ in Thousands	May 06, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Senior Notes
Acquisition obligations and other notes payable		$ 181,757		$ 181,757	$ 183,979
Finance Lease, Liability		$ 280,138		$ 280,138	282,737
Debt Instrument, Interest Rate During Period		5.09%		5.14%
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.66%		4.66%
Total debt principal outstanding		$ 8,211,895		$ 8,211,895	10,154,216
Discount and deferred financing costs		(75,979)		(75,979)	(52,000)
Total amount of long-term debt		8,135,916		8,135,916	10,102,216
Less current portion		(121,441)		(121,441)	(1,929,369)
Long-term debt		8,014,475		$ 8,014,475	8,172,847
Debt Instrument, table footnotes
Long-Term Debt Maturity Extension Term	6 months
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		1,776,250		$ 1,776,250
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		1,492,200		$ 1,492,200
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
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		0		$ 0
Senior Notes
Senior Notes		$ 0		$ 0	1,250,000
Debt Instrument, Interest Rate During Period
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Aug. 15, 2022
Notes Payable, Other Payables
Senior Notes
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.50%		5.50%
Debt Instrument, Maturity Date, Description				2019-2027
Finance Lease
Senior Notes
Finance Lease, Weighted Average Discount Rate, Percent		5.36%		5.36%
Debt Instrument, Maturity Date, Description				2020-2037
New Term Loan A
Debt Instrument [Line Items]
Senior Secured Credit Facilities		$ 1,750,000		$ 1,750,000
Debt Instrument, Description of Variable Rate Basis				LIBOR + 1.50%
Debt Instrument, Maturity Date				Aug. 12, 2024
Debt Instrument, Fair Value Disclosure		1,750,000		$ 1,750,000
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Aug. 12, 2024
New Term Loan B
Debt Instrument [Line Items]
Senior Secured Credit Facilities		2,750,000		$ 2,750,000
Debt Instrument, Description of Variable Rate Basis				LIBOR + 2.25%
Debt Instrument, Maturity Date				Aug. 12, 2026
Debt Instrument, Fair Value Disclosure		2,770,625		$ 2,770,625
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Aug. 12, 2026
Prior Term Loan A
Debt Instrument [Line Items]
Senior Secured Credit Facilities					675,000
Debt Instrument, Maturity Date				Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		0		$ 0
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Dec. 24, 2019
Prior Term Loan A-2
Debt Instrument [Line Items]
Senior Secured Credit Facilities					995,000
Debt Instrument, Maturity Date				Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		0		$ 0
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Dec. 24, 2019
Prior Term Loan B
Debt Instrument [Line Items]
Senior Secured Credit Facilities					3,342,500
Debt Instrument, Maturity Date				Jun. 24, 2021
Debt Instrument, Fair Value Disclosure		$ 0		$ 0
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Jun. 24, 2021
Senior Secured Credit Facilities
Senior Notes
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.30%		4.30%
Debt Instrument, table footnotes
Debt Instrument, Unamortized Discount		$ 6,708		$ 6,708	6,104
Deferred Offering Costs		47,255		47,255	12,580
Senior Notes
Debt Instrument, table footnotes
Deferred Offering Costs		22,016		$ 22,016	33,316
London Interbank Offered Rate (LIBOR) \| New Term Loan A
Debt Instrument, table footnotes
LIBOR plus interest rate margin				1.50%
Minimum \| London Interbank Offered Rate (LIBOR) \| New Term Loan A
Debt Instrument, table footnotes
LIBOR plus interest rate margin				1.00%
Minimum \| London Interbank Offered Rate (LIBOR) \| New Term Loan B
Debt Instrument, table footnotes
LIBOR plus interest rate margin				2.25%
Minimum \| London Interbank Offered Rate (LIBOR) \| Prior Term Loan A
Debt Instrument, table footnotes
LIBOR plus interest rate margin			2.00%
Minimum \| London Interbank Offered Rate (LIBOR) \| Prior Term Loan A-2
Debt Instrument, table footnotes
LIBOR plus interest rate margin			1.00%
Minimum \| London Interbank Offered Rate (LIBOR) \| Prior Term Loan B
Debt Instrument, table footnotes
LIBOR plus interest rate margin			2.75%
Prior revolving line of credit
Debt Instrument [Line Items]
Senior Secured Credit Facilities					$ 175,000
Debt Instrument, Maturity Date				Dec. 24, 2019
Debt Instrument, Fair Value Disclosure		0		$ 0
Debt Instrument, table footnotes
Debt Instrument, Maturity Date				Dec. 24, 2019
Prior revolving line of credit \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument, table footnotes
LIBOR plus interest rate margin			2.00%
New revolving line of credit
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Aug. 12, 2024
Debt Instrument, table footnotes
Maximum borrowing capacity on the revolving credit facilities		$ 1,000,000		$ 1,000,000
Debt Instrument, Maturity Date				Aug. 12, 2024
New revolving line of credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument, table footnotes
LIBOR plus interest rate margin				1.50%