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Costs Incurred for Property Acquisition, Exploration and Development (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
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Apr. 30, 2014 | Dec. 31, 2014
Conger Exchange Transaction |  |
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |
Cash proceeds from sale of assets | $ 145.0 | $ 145.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References No definition available. + Details
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- Details
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