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Suspended Exploratory Well Costs - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
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Jun. 30, 2013 Well | Dec. 31, 2012 | Jun. 30, 2013 Pennsylvania Well | Jun. 30, 2013 East Texas
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Capitalized exploratory well costs that have been capitalized for more than one year | $ 20,519 | $ 11,395 |  |
Number of wells waiting on pipeline | 5 |  |  |
Number of wells in completion stage | 3 |  |  |
Number of wells not operated | 4 |  |  |
Number of wells in marcellus shale area |  |  | 7 |
Sale of oil and gas properties |  |  |  | 75.00%

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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FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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