Employee Benefit Plans - Change in Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at the beginning of the year	$ 4,923	$ 4,752
Actual return	450	355
Employer contribution	1,242	903
Benefits paid	(837)	(851)
Effect of exchange rate changes	(138)	(236)
Plan assets at the ending of the year	$ 5,640	$ 4,923