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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation [Abstract]    
Beginning of period $ 251,076 $ 312,754
Liabilities incurred 1,483 4,063
Acquisitions 123 0
Liabilities settled (4,634) (5,953)
Disposition of wells (176,748) (82,576)
Accretion expense 7,518 15,658
Change in estimate 1,004 7,130
End of period 79,822 251,076
Less current portion (6,689) (2,393)
Long-term asset retirement obligations $ 73,133 $ 248,683