Acquisitions and Dispositions - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | ||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Miscallaneous Proved Property
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Apr. 30, 2013
Delaware and Permian Basin
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Jun. 30, 2013
Miscellaneous Proved and Unproved Properties
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Jun. 30, 2014
Nora Gathering, LLC
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Jun. 30, 2014
Nora Gathering, LLC
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Jun. 30, 2014
Conger Exchange Transaction
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Apr. 30, 2014
Conger Exchange Transaction
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Apr. 30, 2014
Conger Exchange Transaction
EQT Corporation
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Jun. 30, 2014
Conger Exchange Transaction
EQT Corporation
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Jun. 30, 2014
Conger Exchange Transaction
EQT Corporation
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Significant Acquisitions And Disposals [Line Items] | ||||||||||||||
Cash proceeds from sale of assets | $ 145,000,000 | $ 145,000,000 | ||||||||||||
Sale and exchange transaction, closing date | Jun. 16, 2014 | |||||||||||||
Gain (loss) on sale of assets | 282,064,000 | 83,287,000 | 281,711,000 | 83,121,000 | 1,600,000 | 83,300,000 | 3,700,000 | 10,000,000 | 10,000,000 | 275,200,000 | ||||
Selling expenses for property sale | 4,200,000 | 5,000,000 | 5,000,000 | |||||||||||
Carrying amount of assets prior to exchange | 271,800,000 | |||||||||||||
Percentage of ownership interest, acquired | 50.00% | 50.00% | ||||||||||||
Percentage of ownership interest with Company | 50.00% | 50.00% | ||||||||||||
Trade receivables relating to acquisition | 5,546,000 | 5,546,000 | ||||||||||||
Recognized revenue from sale of property interests acquired | 2,800,000 | |||||||||||||
Net operating income | 2,100,000 | |||||||||||||
Proceeds from sale of oil and gas | $ 1,100,000 | $ 275,000,000 | $ 25,200,000 |