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Supplemental Information on Oil and Gas Producing Activities - Capitalized Costs Relating to Oil and Gas Producing Activities (Parenthetical)(Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Extractive Industries [Abstract] | |||
| Asset retirement cost | $ 5.2us-gaap_CostsIncurredAssetRetirementObligationIncurred | $ 5.2us-gaap_CostsIncurredAssetRetirementObligationIncurred | $ 4.7us-gaap_CostsIncurredAssetRetirementObligationIncurred |
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- Definition
Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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