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Employee benefits - Accumulated other comprehensive losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plans
Amounts recognized in accumulated other comprehensive losss:
Net loss	$ 225,356	$ 265,899
Accumulated other comprehensive loss	225,356	265,899	$ 288,882
OPEB Plan
Amounts recognized in accumulated other comprehensive losss:
Net loss	12,993	32,152
Accumulated other comprehensive loss	$ 12,993	$ 32,152	$ 21,472

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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