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Costs Incurred for Property Acquisition, Exploration and Development (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |  |  |
Acquisitions | [1] | $ 0 |  |  | $ 404,252 | [2]
Acreage purchases | [1] | 45,416 |  |  | 226,475 |
Development | [1] | 634,347 |  |  | 1,119,896 |
Gas gathering facilities: |  |  |  |  |  |
Development | [1] | 10,914 |  |  | 13,137 |
Subtotal | [1] | 785,882 |  |  | 2,008,233 |
Asset retirement obligations |  | 19,862 | [1] | $ 7,815 | 56,822 | [1]
Total costs incurred | [1] | 805,744 |  |  | 2,065,055 |
Drilling |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | [1] | 78,059 |  |  | 180,925 |
Expense |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | [1] | 14,975 |  |  | 58,979 |
Stock-based compensation expense |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | [1] | $ 2,171 |  |  | $ 4,569 |
[1] | Includes costs incurred whether capitalized or expensed.
[2] | The year ended December 31, 2014 represents the EQT assets in Virginia we received as part of the Conger Exchange transaction. The transaction was recorded at fair value and we also received $145.0 million in cash, before closing adjustments.

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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties associated with business combination. + References No definition available. + Details
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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62014-109447 + Details
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