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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
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)