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Employee benefits - Funded Status of the plan (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Funded status of the plan: |  |  |
Fair value of plan assets at end of year | $ 652,426 | $ 619,885 |
Pension Plans |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | (635,794) | (628,175) | $ (851,471)
Fair value of plan assets at end of year | 652,426 | 619,885 | 860,484
Funded status at year end | 16,632 | (8,290) | 9,013
OPEB Plan |  |  |
Funded status of the plan: |  |  |
Benefit obligation at end of year | (117,045) | (118,336) | (159,958)
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at year end | $ (117,045) | $ (118,336) | $ (159,958)

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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