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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, 2019 USD ($)
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Extractive Industries [Abstract] |
Undiscounted future asset retirement costs estimation | $ 339.1

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- Definition Undiscounted future net cash flows relating to proved oil and gas asset retirement costs estimation. + References No definition available. + Details
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Period Type: | instant

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- References No definition available. + Details
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