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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Extractive Industries [Abstract] |  |
Estimated proved reserves (percent) | 100.00% | 100.00%

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- Definition Estimates Of Proved Reserves Percentage + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration