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Employee benefits - Accumulated other comprehensive losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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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

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