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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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