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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation [Abstract]    
Beginning of period $ 251,076 $ 312,754
Liabilities incurred 1,890 4,063
Acquisitions 123 0
Liabilities settled (3,068) (5,953)
Disposition of wells (176,747) (82,576)
Accretion expense 6,207 15,658
Change in estimate 2,573 7,130
End of period 82,054 251,076
Less current portion (2,103) (2,393)
Long-term asset retirement obligations $ 79,951 $ 248,683