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Pension and other postretirement benefits - Amounts recognized in consolidated balance sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Payroll and benefit-related liabilities | $ (122,366) | $ (115,981)
Pension and postretirement benefit liabilities | (74,499) | (82,719)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 3,703 | 2,449
Payroll and benefit-related liabilities | (1,721) | (1,617)
Pension and postretirement benefit liabilities | (45,703) | (47,768)
Accumulated other comprehensive loss (gain) | 232,540 | 213,989
Amounts recognized in balance sheet | 188,819 | 167,053
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 0 | 0
Payroll and benefit-related liabilities | (3,125) | (5,091)
Pension and postretirement benefit liabilities | (28,796) | (34,951)
Accumulated other comprehensive loss (gain) | (1,617) | 1,916
Amounts recognized in balance sheet | $ (33,538) | $ (38,126)

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