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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Long-term debt (Detail) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
Long-term debt (Detail) - USD ($) $ in Thousands	Aug. 11, 2020	Jun. 09, 2020	Feb. 13, 2020	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Senior Notes
Debt interest rate during period					3.31%	3.76%
Acquisition obligations, other notes payable, and financing lease obligations
Long-term debt, weighted average interest rate, at point in time					3.11%	3.11%
Total debt principal outstanding					$ 8,111,277	$ 8,111,277	$ 8,181,074
Discount and deferred financing costs					(80,945)	(80,945)	(72,840)
Carrying amount of long-term debt, net of unamortized discounts					8,030,332	8,030,332	8,108,234
Less current portion					(163,787)	(163,787)	(130,708)
Total long-term debt					7,866,545	7,866,545	7,977,526
Senior Notes Three Point Seven Five Percent Due Twenty Thirty One
Senior Notes
Senior Notes	$ 1,500,000				1,500,000	$ 1,500,000	0
Debt interest rate during period	3.75%					3.75%
Debt Instrument, Maturity Date						Feb. 15, 2031
Debt Instrument, Fair Value Disclosure					1,445,625	$ 1,445,625
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					1,799,018	$ 1,799,018
Senior Notes Five Point One Two Five Percent Due Twenty Twenty Four
Senior Notes
Senior Notes					0	$ 0	1,750,000
Debt Instrument, Maturity Date						Jul. 15, 2024
Senior Notes Five Point Zero Percent Due Twenty Twenty Five
Senior Notes
Senior Notes					0	$ 0	1,500,000
Debt Instrument, Maturity Date						May 01, 2025
Acquisition obligations and other notes payable
Acquisition obligations, other notes payable, and financing lease obligations
Acquisition obligations and other notes payable					$ 157,864	$ 157,864	180,352
Debt instrument, maturity date, description						2020-2036
Long-term debt, weighted average interest rate, at point in time					5.01%	5.01%
Acquisition obligations and other notes payable, fair value					$ 157,864	$ 157,864
Financing lease obligations
Acquisition obligations, other notes payable, and financing lease obligations
Financing lease obligations					$ 274,611	$ 274,611	268,534
Debt instrument, maturity date, description						2021-2038
Finance lease, weighted average discount rate, percent					5.16%	5.16%
Revolving line of credit
Senior Secured Credit Facilities
Secured Debt					$ 0	$ 0	0
Debt Instrument, Description of Variable Rate Basis						LIBOR + 1.75%
Senior Notes
Debt Instrument, Maturity Date						Aug. 12, 2024
Term Loan A
Senior Secured Credit Facilities
Secured Debt					1,706,250	$ 1,706,250	1,739,063
Debt Instrument, Description of Variable Rate Basis						LIBOR + 1.75%
Senior Notes
Debt Instrument, Maturity Date						Aug. 12, 2024
Debt Instrument, Fair Value Disclosure					1,689,188	$ 1,689,188
Term Loan B-1
Senior Secured Credit Facilities
Secured Debt			$ 2,743,125		2,722,552	$ 2,722,552	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					2,681,713	$ 2,681,713
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 \| Subsequent Event
Debt Instrument, table footnotes
LIBOR plus interest rate margin				1.50%