Oil And Natural Gas Properties And Equipment (Schedule Of Capitalized Exploratory Well Costs) (Detail) |
Dec. 31, 2015
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Dec. 31, 2014
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Dec. 31, 2013
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| Supplemental Information On Oil And Gas Producing Activities [Abstract] | |||
| Exploratory well costs capitalized for greater than one year | $ 8,900,000 | $ 16,700,000 | |
| Total capitalized exploratory well costs | $ 8,900,000 | $ 16,700,000 | |
| Number of projects capitalized for greater than a year | item | 0 | 1 | 2 |
| X | ||||||||||
- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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