Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Plan Obligations and Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	$ (26,851)	$ (30,507)
Service cost	(1,211)	(1,314)	$ (1,189)
Interest cost	(720)	(615)	(836)
Actuarial gain (loss) - experience	431	247
Actuarial gain (loss) - assumptions	(2,628)	2,078
Benefit payments	52	81
Effects of foreign currency exchange rate changes	916	3,179
Projected benefit obligation at end of period	(30,011)	(26,851)	(30,507)
Change in plan assets:
Fair value of plan assets at beginning of period	19,213	20,338
Actual return on plan assets	1,494	988
Effects of foreign currency exchange rate changes	(662)	(2,113)
Fair value of plan assets at end of period	20,045	19,213	$ 20,338
Funded (unfunded) status at end of period	$ (9,966)	$ (7,638)