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Long-term debt (Detail) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
Long-term debt (Detail) - USD ($) $ in Thousands	Jul. 15, 2020	Jun. 09, 2020	Feb. 13, 2020	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Senior Notes
Debt interest rate during period				3.64%	3.98%
Acquisition obligations, other notes payable, and financing lease obligations
Long-term debt, weighted average interest rate, at point in time				3.65%	3.65%
Total debt principal outstanding				$ 9,886,314	$ 9,886,314	$ 8,181,074
Discount and deferred financing costs				(85,080)	(85,080)	(72,840)
Carrying amount of long-term debt, net of unamortized discounts				9,801,234	9,801,234	8,108,234
Less current portion				(1,906,560)	(1,906,560)	(130,708)
Total long-term debt				7,894,674	7,894,674	7,977,526
Senior Notes Four Point Six Two Five Percent Due Twenty Thirty
Senior Notes
Senior Notes		$ 1,750,000		1,750,000	$ 1,750,000	0
Debt interest rate during period		4.625%			4.625%
Debt Instrument, Maturity Date					Jun. 01, 2030
Debt Instrument, Fair Value Disclosure				1,744,400	$ 1,744,400
Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four
Senior Notes
Senior Notes						1,750,000
Debt interest rate during period					5.125%
Debt Instrument, Maturity Date					Jul. 15, 2024
Debt Instrument, Fair Value Disclosure				1,781,500	$ 1,781,500
Senior Notes Five Point Zero Percent Due Twenty Twenty Five
Senior Notes
Senior Notes				1,500,000	$ 1,500,000	1,500,000
Debt interest rate during period					5.00%
Debt Instrument, Maturity Date					May 01, 2025
Debt Instrument, Fair Value Disclosure				1,537,500	$ 1,537,500
Acquisition obligations and other notes payable
Acquisition obligations, other notes payable, and financing lease obligations
Acquisition obligations and other notes payable				$ 163,207	$ 163,207	180,352
Debt instrument, maturity date, description					2020-2036
Long-term debt, weighted average interest rate, at point in time				4.93%	4.93%
Acquisition obligations and other notes payable, fair value				$ 163,207	$ 163,207
Financing lease obligations
Acquisition obligations, other notes payable, and financing lease obligations
Financing lease obligations				$ 276,510	$ 276,510	268,534
Debt instrument, maturity date, description					2020-2038
Finance lease, weighted average discount rate, percent				5.25%	5.25%
Revolving line of credit
Senior Secured Credit Facilities
Secured Debt				$ 0	$ 0	0
Debt Instrument, Description of Variable Rate Basis					LIBOR + 1.50%
Senior Notes
Debt Instrument, Maturity Date					Aug. 12, 2024
Debt Instrument, Fair Value Disclosure				0	$ 0
Term Loan A
Senior Secured Credit Facilities
Secured Debt				1,717,188	$ 1,717,188	1,739,063
Debt Instrument, Description of Variable Rate Basis					LIBOR + 1.50%
Senior Notes
Debt Instrument, Maturity Date					Aug. 12, 2024
Debt Instrument, Fair Value Disclosure				1,669,965	$ 1,669,965
Term Loan B-1
Senior Secured Credit Facilities
Secured Debt			$ 2,743,125	2,729,409	$ 2,729,409	0
Debt Instrument, Description of Variable Rate Basis					LIBOR + 1.75%
Senior Notes
Debt Instrument, Maturity Date			Aug. 12, 2026		Aug. 12, 2026
Debt Instrument, Fair Value Disclosure				2,657,762	$ 2,657,762
Debt Instrument, table footnotes
Debt Instrument Agreement Date			Feb. 13, 2020
Term Loan B
Senior Secured Credit Facilities
Secured Debt				0	$ 0	$ 2,743,125
Senior Notes
Debt Instrument, Maturity Date					Aug. 12, 2026
London Interbank Offered Rate (LIBOR) \| Term Loan B-1
Debt Instrument, table footnotes
LIBOR plus interest rate margin			1.75%
London Interbank Offered Rate (LIBOR) \| Term Loan A and Revoling line of credit
Debt Instrument, table footnotes
LIBOR plus interest rate margin			1.75%
Current portion of long-term debt \| Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four
Senior Notes
Senior Notes				$ 1,750,000	$ 1,750,000
Subsequent Event \| Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four
Debt Instrument, table footnotes
Debt Instrument Redeemed Outstanding Principal Amount	$ 1,750,000
Debt Instrument Redemption Date	Jul. 15, 2020