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Employee Benefit Plans - Changes in Other Comprehensive Income (Detail) - Defined Benefit Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss) arising during the year	$ 1,330	$ (2,709)	$ 498
Amortization of actuarial (gain) loss	1,584	1,937	1,704
Total	$ 2,914	$ (772)	$ 2,202

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