Estimated Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 7,308	$ 7,682
Service cost	26	50	$ 38
Interest cost	54	62	46
Actuarial (gain) loss	471	75
Benefits paid	(636)	(560)
Curtailment	(346)	0
Other	0	11
Foreign exchange impact	69	(12)
Benefit obligation at end of year	6,946	7,308	7,682
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	835	908
Return on plan assets	35	31
Employer contributions	93	110
Benefits paid	(63)	(185)
Foreign exchange impact	10	(29)
Fair value of plan assets at end of year	910	835	$ 908
Plan assets less than benefit obligation - Net amount recognized	$ (6,036)	$ (6,473)