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Acquisitions and Dispositions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2013 Surface Acreage in North Texas | Sep. 30, 2014 Miscellaneous Proved Property | Sep. 30, 2013 Drilling Company | Sep. 30, 2013 Unproved Leases | Jun. 30, 2013 Delaware and Permian Basin | Sep. 30, 2013 Miscellaneous Proved and Unproved Properties | Sep. 30, 2014 EQT Corporation | Sep. 30, 2014 Nora Gathering, LLC | Sep. 30, 2014 Conger Exchange Transaction | Sep. 30, 2014 Conger Exchange Transaction | Apr. 30, 2014 Conger Exchange Transaction | Apr. 30, 2014 Conger Exchange Transaction EQT Corporation | Sep. 30, 2014 Conger Exchange Transaction EQT Corporation
Significant Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  | $ 145,000,000 |
Sale and exchange transaction, closing date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 16, 2014
Gain (loss) on sale of assets | 167,000 | 6,008,000 | 281,878,000 | 89,129,000 | 253,000 | 1,700,000 |  | 1,700,000 | 83,300,000 | 4,100,000 |  |  |  |  |  | 275,200,000 |
Selling expenses for property sale |  |  |  |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  | 5,000,000
Carrying amount of assets prior to exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 271,800,000 |  |
Percentage of ownership interest, acquired |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Percentage of ownership interest with Company |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Trade receivables relating to acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 | 5,500,000 |  |  |
Recognized revenue from sale of property interests acquired |  |  |  |  |  |  |  |  |  |  |  |  | 18,400,000 |  |  |  |
Net operating income |  |  |  |  |  |  |  |  |  |  |  |  | 14,600,000 |  |  |  |
Proceeds from sale of oil and gas |  |  |  |  | 5,300,000 | 2,100,000 |  | 2,600,000 | 275,000,000 | 26,000,000 |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of business |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |  |  |

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- Definition The amount of the book value of the total assets prior to the sale or exchange of the oil and gas properties that are being sold to a third party. + References No definition available. + Details
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- Definition Sale and exchange transaction closing date. + References No definition available. + Details
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- Definition The amount of selling expenses paid to third parties associated with the sale of oil and gas property. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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