Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0
Interest cost on projected benefit obligation	34	38	49
Amortization of transition obligation	0	0	0
Gain amortization	(60)	(35)	(21)
Net periodic benefit cost	$ (26)	$ 3	$ 28