Commitments and Contingencies - Schedule of Future Minimum Transportation Fees Due (Detail) $ in Thousands	Dec. 31, 2018 USD ($)	[1]
Disclosure Commitments And Contingencies Schedule Of Future Minimum Transportation And Gathering Fees [Abstract]
2019	$ 960,000
2020	905,162
2021	878,205
2022	834,506
2023	798,629
Thereafter	5,854,692
Transportation, Gathering and Processing Contracts	$ 10,231,194

[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.