Acquisitions and Dispositions - Summary of Fair Value of Assets Acquired and Liabilities Assumed in Transaction (Detail) (Conger Exchange Transaction, USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014
Business Acquisition [Line Items]
Fair value of net assets transferred	$ 550,273
Cash	145,000
Other liabilities-firm transportation contract	(12,092)
Asset retirement obligations	(11,927)
Fair value of net assets acquired and liabilities assumed	550,273
Natural Gas and Oil Properties
Business Acquisition [Line Items]
Properties	407,255
Transportation and field assets
Business Acquisition [Line Items]
Properties	7,793
Nora Gathering, LLC
Business Acquisition [Line Items]
Working capital – Nora Gathering, LLC	$ 14,244

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

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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

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-Publisher FASB

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-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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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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

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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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The amount of property, plant, and equipment recognized as of the acquisition date.

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