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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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Long-term debt (Detail) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
Long-term debt (Detail) - USD ($) $ in Thousands	Feb. 26, 2021	Jun. 09, 2020	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Senior Secured Credit Facilities
Debt interest rate during period			3.34%	3.26%
Long-term debt, weighted average interest rate, at point in time			3.34%	3.34%
Total debt principal outstanding			$ 8,997,470	$ 8,997,470	$ 8,163,521
Discount and deferred financing costs			(59,769)	(59,769)	(77,717)
Carrying amount of long-term debt, net of unamortized discounts			8,937,701	8,937,701	8,085,804
Less current portion			(166,818)	(166,818)	(168,541)
Total long-term debt			8,770,883	8,770,883	7,917,263
Senior Notes Four Point Six Two Five Percent Due Twenty Thirty
Senior Secured Credit Facilities
Senior Notes		$ 1,750,000	2,750,000	$ 2,750,000	1,750,000
Debt interest rate during period		4.625%		4.625%
Debt Instrument, Maturity Date	Jun. 01, 2030			Jun. 01, 2030
Debt Instrument, Fair Value Disclosure			2,825,625	$ 2,825,625
Senior Notes Three Point Seven Five Percent Due Twenty Thirty One
Senior Secured Credit Facilities
Senior Notes			1,500,000	$ 1,500,000	1,500,000
Debt interest rate during period				3.75%
Debt Instrument, Maturity Date				Feb. 15, 2031
Debt Instrument, Fair Value Disclosure			1,460,625	$ 1,460,625
Acquisition obligations and other notes payable
Senior Secured Credit Facilities
Acquisition obligations and other notes payable			$ 133,260	$ 133,260	164,160
Debt instrument, maturity date, description				2021-2036
Long-term debt, weighted average interest rate, at point in time			4.78%	4.78%
Acquisition obligations and other notes payable, fair value			$ 133,260	$ 133,260
Financing lease obligations
Senior Secured Credit Facilities
Financing lease obligations			$ 300,340	$ 300,340	274,292
Debt instrument, maturity date, description				2022-2038
Finance lease, weighted average discount rate, percent			4.62%	4.62%
Revolving line of credit
Senior Secured Credit Facilities
Secured Debt			$ 0	$ 0	75,000
Debt Instrument, Description of Variable Rate Basis				LIBOR+1.50%
Debt Instrument, Maturity Date				Aug. 12, 2024
Term Loan A
Senior Secured Credit Facilities
Secured Debt			1,618,750	$ 1,618,750	1,684,375
Debt Instrument, Description of Variable Rate Basis				LIBOR+1.50%
Debt Instrument, Maturity Date				Aug. 12, 2024
Debt Instrument, Fair Value Disclosure			1,618,750	$ 1,618,750
Term Loan B-1
Senior Secured Credit Facilities
Secured Debt			2,695,120	$ 2,695,120	2,715,694
Debt Instrument, Description of Variable Rate Basis				LIBOR+1.75%
Debt Instrument, Maturity Date				Aug. 12, 2026
Debt Instrument, Fair Value Disclosure			$ 2,688,383	$ 2,688,383
Senior Secured Credit Facilities
Senior Secured Credit Facilities
Long-term debt, weighted average interest rate, at point in time			2.16%	2.16%
Debt Instrument, table footnotes
Debt Instrument, Unamortized Discount			$ 4,719	$ 4,719	5,461
Deferred Offering Costs			29,340	29,340	35,825
Senior Notes
Debt Instrument, table footnotes
Debt Instrument, Unamortized Premium			(16,381)	(16,381)
Deferred Offering Costs			$ 42,091	$ 42,091	$ 36,431