Acquisitions and Dispositions - Summary of Fair Value of Assets Acquired and Liabilities Assumed in Transaction (Detail) (EQT Corporation, USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2014
EQT Corporation
Business Acquisition [Line Items]
Fair value of net assets transferred	$ 550,273
Cash	145,000
Working capital – Nora Gathering, LLC	14,244
Natural gas and oil properties	407,255
Transportation and field assets	7,793
Other liabilities-firm transportation contract	(12,092)
Asset retirement obligations	(11,927)
Fair value of net assets acquired and liabilities assumed	$ 550,273

Amount of total asset retirement obligations assumed at the acquisition date.

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- Definition

Business combination recognized identifiable assets acquired and liabilities assumed natural gas and oil properties.

+ References

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- Definition

Business combination recognized identifiable assets acquired and liabilities assumed transportation and field assets.

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- Definition

Business combination recognized identifiable assets acquired and liabilities assumed working capital of subsidiary.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

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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.

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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