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Commitments and Contingencies - Purchase Commitments Under the Contracts (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
CO2 Minimum Purchase Commitment [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total $ 6,969
2021 3,729
2022 3,240
2023 0
2024 0
2025 0
Thereafter 0
Midstream services [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total 28,193
2021 12,841
2022 12,394
2023 2,958
2024 0
2025 0
Thereafter $ 0