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Suspended Exploratory Well Costs - Additional Information (Detail) $ in Thousands | Dec. 31, 2015 USD ($) Well | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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Extractive Industries [Abstract] |  |  |
Capitalized exploratory well costs that have been capitalized for a period greater than one year | $ | $ 2,996 | $ 0 | $ 6,964
Number of well in completion phase | Well | 1 |  |

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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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- References No definition available. + Details
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- Definition The number of wells in the process of being drilled in each geographic area as of the date listed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1206 -Paragraph (a) + Details
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