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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  | 0 Months Ended
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Sep. 30, 2013 Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP | Sep. 30, 2013 General Land Office of the State of Texas | Sep. 30, 2013 Patriot Exploration, LLC, Jonathan Feldman, Redwing Drilling Partners, Mapleleaf Drilling Partners, Avalanche Drilling Partners, Penguin Drilling Partners and Gramax Insurance Company Ltd. | Sep. 30, 2013 Treating Agreement bcf | Sep. 30, 2013 Treating Agreement Minimum | Sep. 30, 2013 Treating Agreement Maximum | Aug. 28, 2013 Kallick action | Oct. 30, 2013 Kallick action Subsequent Event
Commitments and Contingencies Disclosure |  |  |  |  |  |  |  |
Damages sought by plaintiff | $ 45.5 | $ 13.0 |  |  |  |  | $ 5.0 |
Plaintiffs investment under participation agreement |  |  | 16.0 |  |  |  |  |
Litigation settlement, amount |  |  |  |  |  |  |  | 2.5
Contract agreement, term |  |  |  | 30 years |  |  |  |
Minimum delivery required (in Bcf) |  |  |  | 3,200 |  |  |  |
Estimated minimum delivery required remaining, long-term |  |  |  | 3,000 |  |  |  |
Initial shortfall price per Mcf |  |  |  | 0.25 |  |  |  |
Shortfall price per Mcf, final year of agreement |  |  |  | 0.70 |  |  |  |
Range of projected shortfall in one year |  |  |  |  | $ 29.5 | $ 36.0 |  |

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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