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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