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Commitments and Contingencies - Purchase Commitments Under the Contracts (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
CO2 Minimum Purchase Commitment [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total $ 19,665
2017 6,740
2018 4,567
2019 4,548
2020 3,810
2021 0
Thereafter 0
Midstream services [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Total 30,668
2017 5,121
2018 5,106
2019 5,107
2020 5,106
2021 5,121
Thereafter $ 5,107