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Suspended Exploratory Well Costs - Aging of Capitalized Exploratory Well Costs Suspended more than One Year (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Exploratory Well Costs Capitalized In Year Two Thousand And Thirteen | Dec. 31, 2012 Exploratory Well Costs Capitalized In Year Two Thousand And Twelve | Dec. 31, 2011 Exploratory Well Costs Capitalized In Year Two Thousand And Eleven | Dec. 31, 2010 Exploratory Well Costs Capitalized In Year Two Thousand And Ten | Dec. 31, 2009 Exploratory Well Costs Capitalized In Year Two Thousand And Nine | Dec. 31, 2008 Exploratory Well Costs Capitalized In Year Two Thousand And Eight
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Aging Of Capitalized Exploratory Well Costs [Line Items] |  |  |  |  |  |  |  |
Capitalized exploratory well costs that have been capitalized for more than one year | $ 20,519 | $ 11,395 | $ 3,828 | $ 6,965 | $ 5,247 | $ 72 | $ 2,884 | $ 1,523

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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