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Capitalization of Exploratory Well Costs - Schedule of Capitalized Exploratory Well Costs (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 Well | Dec. 31, 2013 Well | Dec. 31, 2012 Well
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Extractive Industries [Abstract] |  |  |
Capitalized exploratory well costs that have been capitalized for a period less than one year |  |  | $ 5.9 us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess
Capitalized exploratory well costs that have been capitalized for a period greater than one year | 8.9 us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 16.7 us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 8.1 us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear
Total | $ 8.9 us-gaap_CapitalizedExploratoryWellCosts | $ 16.7 us-gaap_CapitalizedExploratoryWellCosts | $ 14.0 us-gaap_CapitalizedExploratoryWellCosts
Number of exploratory wells that have been capitalized for a period greater than one year | 1 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 2 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 1 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear

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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=8451039&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=8451039&loc=SL6806780-109447 + Details
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- Definition The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. + References No definition available. + Details
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- 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=8451039&loc=SL6806780-109447 + Details
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