Long-term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt	$ 3,005,567	$ 3,004,532
Debt, Less current maturities	(131,624)	(232,595)
Debt, excluding current maturities	2,873,943	2,771,937
Deferred financing costs	41,379	24,414
Deferred financing costs, Less current maturities	(556)	(6,081)
Deferred financing costs, excluding current maturities	40,823	18,333
Debt, net of deferred financing costs	2,964,188	2,980,118
Debt, net of deferred financing costs, Less current maturities	(131,068)	(226,514)
Debt, net of deferred financing costs, excluding current maturities	2,833,120	2,753,604
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt	668,402	1,127,069
Deferred financing costs	12,134	9,077
Debt, net of deferred financing costs	656,268	1,117,992
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Debt	122,500	175,000
Deferred financing costs	556	846
Debt, net of deferred financing costs	121,944	174,154
3 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	600,000
Deferred financing costs	8,236
Debt, net of deferred financing costs	591,764
4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	549,260
Deferred financing costs	7,855
Debt, net of deferred financing costs	541,405
4 7/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	400,000
Deferred financing costs	5,725
Debt, net of deferred financing costs	394,275
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	653,810	654,345
Deferred financing costs	6,873	7,752
Debt, net of deferred financing costs	646,937	646,593
Other Notes with Various Rates and Terms [Member]
Debt Instrument [Line Items]
Debt	11,595	3,118
Debt, net of deferred financing costs	$ 11,595	3,118
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt		535,000
Deferred financing costs		3,237
Debt, net of deferred financing costs		531,763
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt		510,000
Deferred financing costs		3,502
Debt, net of deferred financing costs		$ 506,498