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Costs Incurred for Property Acquisition, Exploration and Development - Costs Incurred for Property Acquisition, Exploration and Development (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |
Acquisitions | $ 409,331 | [1],[2] |  |
Acreage purchases | 143,850 | [1] | 137,538 | [1]
Development | 775,570 | [1] | 938,668 | [1]
Gas gathering facilities: |  |  |  |
Development | 12,986 | [1] | 47,086 | [1]
Subtotal | 1,496,589 | [1] | 1,377,443 | [1]
Asset retirement obligations | 7,815 | [1] | 76,373 | [1]
Total costs incurred | 1,504,404 | [1] | 1,453,816 | [1]
Drilling |  |  |  |
Exploration: |  |  |  |
Exploration costs incurred | 114,942 | [1] | 189,742 | [1]
Expense |  |  |  |
Exploration: |  |  |  |
Exploration costs incurred | 36,502 | [1] | 60,384 | [1]
Stock-based compensation expense |  |  |  |
Exploration: |  |  |  |
Exploration costs incurred | $ 3,408 | [1] | $ 4,025 | [1]
[1] | Includes costs incurred whether capitalized or expensed.
[2] | See also Note 4 for additional information related to the Conger Exchange. Includes $134.8 million of gas gathering assets.

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