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Goodwill and Intangible Assets, Net (Narrative) (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Jan. 01, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Number of operating segments | segment	6
Goodwill impairment charge	$ 77,343
Goodwill	4,688,348	$ 4,390,261		$ 4,351,170	$ 1,422,825
Property and equipment, net	$ 4,783,928	4,738,055
Long-term Franchise Agreements and Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	16 years 10 months 25 days
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	10 years
Permits and Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	40 years
Exploration and Production [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value discount rate	11.70%
Goodwill impairment charge	$ 77,343	0
Goodwill		$ 77,343	$ 77,343	$ 77,343	$ 77,343

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