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Employee benefits - Accumulated other comprehensive losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Pension Plans |  |  |
Amounts recognized in accumulated other comprehensive losss: |  |  |
Net loss | $ 243,434 | $ 225,356 |
Accumulated other comprehensive loss | 243,434 | 225,356 | $ 265,899
OPEB Plan |  |  |
Amounts recognized in accumulated other comprehensive losss: |  |  |
Net loss | (26,486) | 12,993 |
Accumulated other comprehensive loss | $ (26,486) | $ 12,993 | $ 32,152

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