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Asset Retirement Obligation - Reconciliation of Total Reclamation Liability for Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance $ 18,888 $ 16,155
Additions and revisions of prior estimates 328 1,975
Accretion expenses 904 758
Settlement of liability (197) 0
Ending balance $ 19,923 $ 18,888