Significant Commitments by Category (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Gathering and Intermediate Transportation
Commitments
2020	$ 12,962
2021	12,962
2022	12,962
2023	12,962
2024	12,962
Thereafter	37,789
Total	102,599
Other Commitments
Commitments
2020	289
2021	140
2022	70
2023	0
2024	0
Thereafter	0
Total	$ 499