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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 | 3 Months Ended | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities [Line Items] |  |  |  |  |
Acreage purchases | $ 48,597 | [1] |  | $ 137,538 | [1]
Development | 223,912 | [1] |  | 938,668 | [1]
Gas gathering facilities: |  |  |  |  |
Development | 3,618 | [1] |  | 47,086 | [1]
Subtotal | 298,711 | [1] |  | 1,377,443 | [1]
Asset retirement obligations | 3,218 | [1] | 1,690 | 76,373 | [1]
Total costs incurred | 301,929 | [1] |  | 1,453,816 | [1]
Drilling |  |  |  |  |
Exploration: |  |  |  |  |
Exploration costs incurred | 7,737 | [1] |  | 189,742 | [1]
Expense |  |  |  |  |
Exploration: |  |  |  |  |
Exploration costs incurred | 13,694 | [1] |  | 60,384 | [1]
Stock-based compensation expense |  |  |  |  |
Exploration: |  |  |  |  |
Exploration costs incurred | $ 1,153 | [1] |  | $ 4,025 | [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 transportation and field equipment costs. + 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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- Definition Amount of asset retirement obligations (ARO) costs incurred (whether capitalized or charged to expense) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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=8451039&loc=d3e62014-109447 + Details
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- Definition Exploration 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 -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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