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Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0
Interest cost on projected benefit obligation	38	49	67
Amortization of transition obligation	0	0	0
Gain amortization	(35)	(21)	(7)
Net periodic benefit cost	$ 3	$ 28	$ 60

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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