Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 4,390,261	$ 1,422,825	$ 1,422,825
Goodwill acquired	261,913	1,766
Impairment loss	(77,343)
Goodwill adjustment for assets sold	321
Impairment loss related to assets held for sale	(29,000)
Goodwill reclassified as assets held for sale	(29,295)
Impact of changes in foreign currency	12,788
Goodwill, Ending Balance	4,529,645	1,424,591	4,390,261
Southern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,470,023	95,710	95,710
Goodwill acquired	11,736	190
Impairment loss related to assets held for sale	(29,000)
Goodwill reclassified as assets held for sale	(29,295)
Goodwill, Ending Balance	1,423,464	95,900	1,470,023
Western [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	376,537	373,820	373,820
Goodwill acquired		1,421
Goodwill, Ending Balance	376,537	375,241	376,537
Eastern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	533,160	459,532	459,532
Goodwill acquired	246,491	7
Goodwill adjustment for assets sold	321
Goodwill, Ending Balance	779,972	459,539	533,160
Canada [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,465,274
Goodwill acquired	3,316
Impact of changes in foreign currency	12,788
Goodwill, Ending Balance	1,481,378		1,465,274
Central [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	467,924	416,420	416,420
Goodwill acquired	370	148
Goodwill, Ending Balance	468,294	416,568	467,924
Exploration and Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	77,343	77,343	77,343
Impairment loss	(77,343)		0
Goodwill, Ending Balance	$ 77,343	$ 77,343	$ 77,343

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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