Commitments and Contingencies - Schedule of Increase to Future Minimum Transportation and Gathering Fees (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Disclosure Commitments And Contingencies Schedule Of Future Minimum Transportation And Gathering Fees [Abstract]
2016	$ 60,522
2017	263,118
2018	263,734
2019	264,293
2020	214,487
Thereafter	1,774,351
Transportation and Gathering Contracts	$ 2,840,505

Change in the minimum commitment related to transportation agreements that must be made within the specified time period of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made within the current period of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made within the fifth year of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made within the fourth year of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made within the third year of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made within the second year of the agreement.

No definition available.

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Change in the minimum commitment related to transportation agreements that must be made thereafter period of the agreement.

No definition available.

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Disclosure commitments and contingencies schedule of future minimum transportation and gathering fees.

No definition available.

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