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Commitments and Contingencies - Purchase Commitments Under the Contracts (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
CO2 Minimum Purchase Commitment [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total $ 4,365
2020 4,365
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Midstream services [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total 11,781
2020 3,967
2021 3,788
2022 3,746
2023 280
2024 0
Thereafter $ 0