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Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Reserve Quantities [Line Items] | |||
| Additions (reductions) of asset retirement obligations | $ 50.6 | $ 86.9 | $ 32.8 |
| Seismic costs | 8.9 | 6.2 | 8.0 |
| Geological and geophysical costs | $ 5.9 | $ 6.2 | $ 6.8 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Asset retirement obligation period increase decrease due to acquisitions, incurred and revisions. No definition available.
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| X | ||||||||||
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- Definition
Geological and Geophysical costs incurred related to development and exploration of oil and gas properties. These costs are included in operating expenses, and therefore are an adjustment to derive costs related to the acquisition of oil and gas properties. No definition available.
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| X | ||||||||||
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- Definition
Seismic costs incurred for the development and exploration of oil and gas properties. These costs are included in operating expenses, and therefore are an adjustment to derive costs related to the acquisition of oil and gas properties. No definition available.
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