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Other long-term liabilities - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Opening balance $ 116,584 $ 142,147
Obligation assumed 1,077 793
Retirement activities (6,902) (27,980)
Accretion 4,440 4,589
Change in cash flow estimates 412 (2,965)
Closing balance $ 115,611 $ 116,584