Employee Benefit Plans - Net Gratuity Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1,638	$ 1,523	$ 1,341
Interest cost	550	559	444
Expected return on plan assets	(385)	(172)	(164)
Actuarial loss	211	149	139
Net gratuity cost	$ 2,014	$ 2,059	$ 1,760