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Other long-term liabilities - Changes in Environmental Remediation Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]
Opening balance	$ 42,457	$ 55,224
Remediation activities	(3,687)	(5,243)
Accretion	1,616	2,167
Changes in cash flow estimates	1,395	1,344
Revision in assumptions	(1,009)	(11,035)
Closing balance	$ 40,772	$ 42,457

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- Definition

Accrual for Environmental Loss Contingencies, Accretion

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- Definition

Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Assumptions

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- Definition

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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