Employee Benefit Plans - Change in Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at the beginning of the year	$ 6,915	$ 5,640
Business acquisition	231
Actual return	779	202
Employer contribution	1,175	1,700
Benefits paid	(1,059)	(1,001)
Effect of exchange rate changes	(621)	374
Plan assets at the ending of the year	$ 7,420	$ 6,915