Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 5,510,851	$ 5,031,685
Goodwill acquired	3,741	4,620
Goodwill acquisition adjustments	(259)	(174)
Goodwill divested		(845)
Impact of changes in foreign currency	(128,492)	30,244
Goodwill, Ending Balance	5,385,841	5,065,530
Eastern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,331,180	1,126,486
Goodwill acquisition adjustments	(524)	(83)
Goodwill, Ending Balance	1,330,656	1,126,403
Southern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,528,225	1,517,610
Goodwill acquisition adjustments	195	(88)
Goodwill divested		(845)
Goodwill, Ending Balance	1,528,420	1,516,677
Western [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	400,037	398,174
Goodwill acquired		918
Goodwill acquisition adjustments	70
Goodwill, Ending Balance	400,107	399,092
Central [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	729,470	540,435
Goodwill acquired	3,741	3,702
Goodwill, Ending Balance	733,211	544,137
Canada [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,521,939	1,448,980
Goodwill acquisition adjustments		(3)
Impact of changes in foreign currency	(128,492)	30,244
Goodwill, Ending Balance	$ 1,393,447	1,479,221
Exploration and Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Goodwill acquired
Goodwill acquisition adjustments
Goodwill divested
Impact of changes in foreign currency
Goodwill, Ending Balance

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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