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Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - Postretirement Benefit Plan [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost for benefits earned(1) | $ 568 | $ 755 | $ 718
Interest cost on projected benefit obligation(2) | 2,265 | 2,460 | 2,710
Net amortization of deferrals(2) | (4,919) | (5,497) | (4,913)
Net periodic benefit cost | (2,086) | (2,282) | $ (1,485)
Net actuarial loss (gain) | 3,941 | (6,677) |
Recognized actuarial loss | (1,132) | (1,506) |
Prior service credit | 0 | 14,862 |
Recognized prior service credit | 6,051 | 7,003 |
Total (gain) loss recognized in OCI (before tax effects) | $ 8,860 | $ (16,042) |

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