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Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
As of December 31, 2019 $ 25,709
Liabilities incurred 165
Liabilities settled (510)
Disposition of properties (143)
Accretion expense 429
Revisions to estimate 108
As of March 31, 2020 25,758
Less: Current asset retirement obligations 2,351
Long-term asset retirement obligations $ 23,407