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Pension and other postretirement benefits - Amounts recognized in consolidated balance sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Payroll and benefit-related liabilities | $ (133,092) | $ (143,657)
Pension and postretirement benefit liabilities | (31,394) | (45,185)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 16,870 | 17,827
Payroll and benefit-related liabilities | (1,408) | (1,602)
Pension and postretirement benefit liabilities | (14,949) | (21,106)
Accumulated other comprehensive loss (gain) | 219,555 | 218,139
Amounts recognized in balance sheet | 220,068 | 213,258
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 0 | 0
Payroll and benefit-related liabilities | (2,175) | (2,725)
Pension and postretirement benefit liabilities | (16,445) | (24,079)
Accumulated other comprehensive loss (gain) | (7,812) | (2,847)
Amounts recognized in balance sheet | $ (26,432) | $ (29,651)

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