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Pension and other postretirement benefits - amounts recognized in consolidated balance sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Payroll and benefit-related liabilities | $ (104,670) | $ (107,415)
Pension and postretirement benefit liabilities | (92,914) | (121,410)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 2,837 | 1,596
Payroll and benefit-related liabilities | (1,729) | (1,767)
Pension and postretirement benefit liabilities | (54,771) | (75,680)
Accumulated other comprehensive loss | 205,910 | 209,365
Amounts recognized in balance sheet | 152,247 | 133,514
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 0 | 0
Payroll and benefit-related liabilities | (3,972) | (3,173)
Pension and postretirement benefit liabilities | (38,143) | (45,730)
Accumulated other comprehensive loss | 364 | 6,715
Amounts recognized in balance sheet | $ (41,751) | $ (42,188)

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