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Employee benefits - Reconciliation of net (liabilities) assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plans |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | $ (68,735) | $ (49,449) |
Amount recognized in AOCL at beginning of year | 304,330 | 290,327 |
Amount prepaid (accued) at beginning of year | 235,595 | 240,878 |
Net periodic benefit (credit) cost | (19,559) | (5,513) | $ (4,996)
Additional benefit cost | 0 | 0 |
Contributions | 20,230 | 230 |
Amount prepaid (accrued) at end of year | 236,266 | 235,595 | 240,878
Accumulated other comprehensive loss | (288,882) | (304,330) | (290,327)
Net (liabilities) assets at end of year | (52,616) | (68,735) | (49,449)
OPEB Plan |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (153,415) | (170,720) |
Amount recognized in AOCL at beginning of year | 5,720 | 24,079 |
Amount prepaid (accued) at beginning of year | (147,695) | (146,641) |
Net periodic benefit (credit) cost | (6,714) | (4,402) | (3,498)
Additional benefit cost | 0 | (1,790) |
Contributions | 7,200 | 5,138 |
Amount prepaid (accrued) at end of year | (147,209) | (147,695) | (146,641)
Accumulated other comprehensive loss | (21,472) | (5,720) | (24,079)
Net (liabilities) assets at end of year | $ (168,681) | $ (153,415) | $ (170,720)

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