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Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation [Abstract]    
Beginning of period $ 79,822 $ 251,076
Liabilities incurred 28 1,483
Acquisitions 0 123
Liabilities settled (720) (4,634)
Disposition of wells   (176,748)
Accretion expense 1,375 7,518
Change in estimate 811 1,004
End of period 81,316 79,822
Less current portion (6,689) (6,689)
Long-term asset retirement obligations $ 74,627 $ 73,133