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Postretirement benefits other than pensions - Expected Benefit Payments and Subsidy Benefits (Detail) - Other Postretirement Benefits Plan
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 6,695
2021 6,372
2022 6,071
2023 5,762
2024 5,475
2025 - 2029 23,181
Employer contributions expected to be paid during the year ending December 31, 2020 $ 6,700