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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Costs Incurred for Property Acquisition, Exploration and Development (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |  |  |
Acreage purchases | $ 137,538 | [1] | $ 188,843 | [1] | $ 220,576 | [1]
Development | 938,668 | [1] | 1,049,129 | [1] | 1,007,049 | [1]
Gas gathering facilities: |  |  |  |  |  |
Development | 47,086 | [1] | 41,035 | [1] | 53,387 | [1]
Subtotal | 1,377,443 | [1] | 1,658,630 | [1] | 1,589,299 | [1]
Asset retirement costs capitalized, net | 76,373 | [1] | 57,982 | [1] | 24,061 | [1]
Total costs incurred | 1,453,816 | [1] | 1,716,612 | [1] | 1,616,601 | [1]
Drilling |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | 189,742 | [1] | 309,816 | [1] | 226,920 | [1]
Expense |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | 60,384 | [1] | 65,758 | [1] | 77,259 | [1]
Stock-based compensation expense |  |  |  |  |  |
Exploration: |  |  |  |  |  |
Exploration costs incurred | 4,025 | [1] | 4,049 | [1] | 4,108 | [1]
Continuing Operations |  |  |  |  |  |
Gas gathering facilities: |  |  |  |  |  |
Total costs incurred | 1,453,816 | [1] | 1,716,612 | [1] | 1,613,360 | [1]
Discontinued Operations |  |  |  |  |  |
Gas gathering facilities: |  |  |  |  |  |
Total costs incurred |  |  |  |  | $ 3,241 | [1]
[1] | Includes cost incurred whether capitalized or expensed.

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- Definition Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense subtotal, prior to impact of asset retirement obligation and discontinued operations. + 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=8451039&loc=d3e62014-109447 + Details
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