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Employee Benefit Plans (Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial gain (loss) | $ 1,979 | $ (2,223) | $ 4,832
Deferred tax (expense) benefit | (416) | 466 | (1,774)
Other comprehensive income (loss), net of tax | $ 1,563 | $ (1,757) | $ 3,058

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