Reconciliation of Net Amount Recognized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized as at beginning of the period	$ (12,349)	$ (12,057)
Company contributions	1,928	1,951
Net periodic benefit cost for the period	(3,509)	(3,734)
Amount recognized in accumulated other comprehensive loss	(863)	960
Adjustments on account of employees transferred	26
Foreign currency translation adjustment	240	531
Net amount recognized as at end of the period	(14,527)	(12,349)
Funded status of the plans	0	0
Accrued benefit cost	(14,527)	(12,349)
Service cost	2,279	2,448
Interest cost	1,167	1,177
Amortization of transition obligation	61	71
Amortization of net actuarial (gain)/loss	2	37
Net periodic benefit costs	$ 3,509	$ 3,733