Commitments and Contingencies - Schedule of Future Minimum Transportation and Gathering Fees (Detail) $ in Thousands	Dec. 31, 2015 USD ($)	[1]
Disclosure Commitments And Contingencies Schedule Of Future Minimum Transportation And Gathering Fees [Abstract]
2016	$ 407,046
2017	401,517
2018	366,914
2019	366,562
2020	359,595
Thereafter	1,748,559
Transportation and Gathering Contracts	$ 3,650,193

[1] The amounts in this table represent the gross amounts that we are committed to pay; however, we will record in our financial statements our proportionate share of costs based on our working interest which can vary based on volumes produced.