Employee Benefit Plans - Summary of Change in Projected Benefit Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligation:
Benefit obligation at the beginning of the year	$ 7,909	$ 7,563
Service cost	1,601	1,638	$ 1,523
Interest cost	599	550	559
Benefits paid	(837)	(851)
Actuarial (gain)/loss	677	(609)
Acquisition	47	0
Effect of exchange rate changes	(285)	(382)
Projected benefit obligation at the end of the year	9,711	7,909	$ 7,563
Unfunded amount–non-current	1,977	1,441
Unfunded amount–current	2,094	1,545
Total accrued liability	4,071	2,986
Accumulated benefit obligation	$ 6,533	$ 5,537