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Employee benefits - Amounts recognized in accumulated other comprehensive loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plans
Amounts recognized in accumulated other comprehensive losss:
Net loss / (gain)	$ 177,017	$ 200,094
Accumulated other comprehensive loss (AOCL)	177,017	200,094	$ 243,434
OPEB Plan
Amounts recognized in accumulated other comprehensive losss:
Net loss / (gain)	(40,048)	(25,454)
Accumulated other comprehensive loss (AOCL)	$ (40,048)	$ (25,454)	$ (26,486)

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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