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Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 6,151,361	$ 5,445,990	$ 5,388,679
Segment EBITDA	1,884,950	1,631,550	1,643,644
Depreciation and amortization	813,009	752,404	743,918
Capital expenditures	744,315	664,561	666,089
Total assets	14,699,924	13,992,364	13,737,695
Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(878,654)	(814,397)	(787,994)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	7,030,015	6,260,387	6,176,673
Segment EBITDA	1,904,546	1,646,833	1,659,082
Eastern [Member]
Segment Reporting Information [Line Items]
Revenue	1,521,288	1,335,865	1,268,964
Segment EBITDA	404,493	343,446	330,578
Depreciation and amortization	239,130	222,934	204,221
Capital expenditures	174,350	181,787	154,218
Total assets	3,652,311	3,134,462	3,099,283
Eastern [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(286,275)	(266,115)	(255,684)
Eastern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,807,563	1,601,980	1,524,648
Segment EBITDA	404,493
Southern [Member]
Segment Reporting Information [Line Items]
Revenue	1,446,746	1,369,580	1,449,000
Segment EBITDA	394,982	369,445	441,425
Depreciation and amortization	188,977	189,726	208,967
Capital expenditures	156,527	131,831	178,127
Total assets	3,513,355	3,402,081	3,952,449
Southern [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(186,656)	(183,107)	(174,614)
Southern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,633,402	1,552,687	1,623,614
Western [Member]
Segment Reporting Information [Line Items]
Revenue	1,280,188	1,149,762	1,098,849
Segment EBITDA	405,778	364,790	338,563
Depreciation and amortization	129,988	115,151	102,067
Capital expenditures	152,149	132,344	147,893
Total assets	2,260,222	1,861,079	1,718,015
Western [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(154,656)	(142,120)	(135,820)
Western [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,434,844	1,291,882	1,234,669
Segment EBITDA	405,778
Central [Member]
Segment Reporting Information [Line Items]
Revenue	1,046,416	880,323	838,584
Segment EBITDA	359,434	313,033	292,111
Depreciation and amortization	134,078	113,004	106,391
Capital expenditures	144,458	102,966	116,831
Total assets	2,332,564	2,160,246	1,885,468
Central [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(142,085)	(127,758)	(119,555)
Central [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,188,501	1,008,081	958,139
Segment EBITDA	359,434
Canada Segment [Member]
Segment Reporting Information [Line Items]
Revenue	856,723	710,460	733,282
Segment EBITDA	339,859	256,119	256,405
Depreciation and amortization	111,458	103,334	113,944
Capital expenditures	68,183	109,886	61,119
Total assets	2,513,608	2,544,379	2,490,291
Canada Segment [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	(108,982)	(95,297)	(102,321)
Canada Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	965,705	805,757	835,603
Segment EBITDA	339,859
Corporate [Member]
Segment Reporting Information [Line Items]
Segment EBITDA	(19,596)	(15,283)	(15,438)
Depreciation and amortization	9,378	8,255	8,328
Capital expenditures	48,648	5,747	7,901
Total assets	$ 427,864	$ 890,117	$ 592,189

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