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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows (Parenthetical) (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Extractive Industries [Abstract]
Undiscounted future asset retirement costs estimation	$ 430.6

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- Definition

Undiscounted future net cash flows relating to proved oil and gas asset retirement costs estimation.

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No definition available.

+ Details

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- References

No definition available.

+ Details

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