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Pension and Other Postretirement Employee Benefit Plans - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 0 |  |  |  | $ 0 |
Non-operating pension and other postretirment benefit (costs) income | 1,531 |  | $ 1,187 |  | 2,845 | $ 2,466
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 1,334 | $ 1,239 | 1,336 | $ 1,419 |  |
Supplemental Employee Retirement Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer contribution |  |  |  |  | 200 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 400 |  |  |  | 400 |
Non Qualified Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 805 |  | (14) |  | 1,249 | (3)
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 1,415 |  | $ 1,682 |  | 2,860 | 3,432
Employer contribution |  |  |  |  | $ 0 | $ 0

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