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Oil And Natural Gas Properties And Equipment (Schedule Of Capitalized Exploratory Well Costs) (Detail) | Dec. 31, 2015 item | Dec. 31, 2014 USD ($) item | Dec. 31, 2013 USD ($) item
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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

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447 + Details
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- Definition The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447 + Details
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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=51678428&loc=SL6806780-109447 + Details
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