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Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 5,726,650	$ 5,510,851
Goodwill acquired	454,597	185,303
Goodwill acquisition adjustments	2
Goodwill divested	(324)	(149)
Impact of changes in foreign currency	6,722	30,645
Goodwill, Ending Balance	6,187,643	5,726,650
Southern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,532,215	1,528,225
Goodwill acquired	56,576	3,990
Goodwill divested	(324)
Goodwill, Ending Balance	1,588,467	1,532,215
Eastern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,374,577	1,331,180
Goodwill acquired	233,146	43,397
Goodwill, Ending Balance	1,607,723	1,374,577
Western [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	442,862	400,037
Goodwill acquired	96,870	42,825
Goodwill, Ending Balance	539,732	442,862
Central [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	824,204	729,470
Goodwill acquired	68,005	94,883
Goodwill divested		(149)
Goodwill, Ending Balance	892,209	824,204
Canada Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,552,792	1,521,939
Goodwill acquired		208
Goodwill acquisition adjustments	2
Impact of changes in foreign currency	6,722	30,645
Goodwill, Ending Balance	1,559,512	1,552,792
Exploration and Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 0	0
Goodwill, Ending Balance		$ 0

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