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Pension and other postretirement benefits - Amounts recognized in consolidated balance sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Payroll and benefit-related liabilities | $ (146,535) | $ (133,092)
Pension and postretirement benefit liabilities | (23,989) | (31,394)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 27,370 | 16,870
Payroll and benefit-related liabilities | (1,439) | (1,408)
Pension and postretirement benefit liabilities | (15,815) | (14,949)
Accumulated other comprehensive loss (gain) | 164,139 | 219,555
Amounts recognized in balance sheet | 174,255 | 220,068
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 0 | 0
Payroll and benefit-related liabilities | (1,361) | (2,175)
Pension and postretirement benefit liabilities | (8,174) | (16,445)
Accumulated other comprehensive loss (gain) | (14,244) | (7,812)
Amounts recognized in balance sheet | $ (23,779) | $ (26,432)

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