Long-term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Aug. 19, 2020	Feb. 06, 2020	Jan. 28, 2016
Debt Instrument [Line Items]
Debt	$ 2,875,468	$ 2,926,633
Debt, Less current maturities	(175,366)	(122,879)
Debt, excluding current maturities	2,700,102	2,803,754
Deferred financing costs	38,087	40,117
Deferred financing costs, Less current maturities	(641)	(445)
Deferred financing costs, excluding current maturities	37,446	39,672
Debt, net of deferred financing costs	2,837,381	2,886,516
Debt, net of deferred financing costs, Less current maturities	(174,725)	(122,434)
Debt, net of deferred financing costs, excluding current maturities	2,662,656	2,764,082
Senior Credit Facility
Debt Instrument [Line Items]
Debt	598,655	598,466
Deferred financing costs	9,873	11,569
Debt, net of deferred financing costs	588,782	586,897
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Debt	175,000	122,500
Deferred financing costs	641	445
Debt, net of deferred financing costs	174,359	122,055
3 3/4% Senior Notes
Debt Instrument [Line Items]
Debt	600,000	600,000
Deferred financing costs	7,288	8,031
Debt, net of deferred financing costs	$ 592,712	$ 591,969
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%		3.75%
3 5/8% Senior Notes
Debt Instrument [Line Items]
Debt	$ 550,000
Deferred financing costs	7,736
Debt, net of deferred financing costs	$ 542,264
Debt Instrument, Interest Rate, Stated Percentage	3.625%
4% Senior Notes
Debt Instrument [Line Items]
Debt	$ 549,339	$ 549,280
Deferred financing costs	7,390	7,911
Debt, net of deferred financing costs	$ 541,949	$ 541,369
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%	4.00%	4.00%
4 7/8% Senior Notes
Debt Instrument [Line Items]
Debt	$ 400,000	$ 400,000
Deferred financing costs	5,159	5,586
Debt, net of deferred financing costs	$ 394,841	$ 394,414
Debt Instrument, Interest Rate, Stated Percentage	4.875%	4.875%
5 3/4% Senior Notes
Debt Instrument [Line Items]
Debt		$ 653,631
Deferred financing costs		6,575
Debt, net of deferred financing costs		$ 647,056
Debt Instrument, Interest Rate, Stated Percentage		5.75%			5.75%
Other Notes with Various Rates and Terms
Debt Instrument [Line Items]
Debt	$ 2,474	$ 2,756
Deferred financing costs	0	0
Debt, net of deferred financing costs	$ 2,474	$ 2,756