Schedule of Funded Status of Gratuity Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 9,081	$ 6,194
Projected benefit obligation at beginning of the year	12,349	12,057
Service cost	2,279	2,448
Interest cost	1,167	1,177
Actuarial loss/(gain)	900	(851)
Adjustments due to transfer of employees within the group	0	0
Benefits paid	(1,928)	(1,951)
Effect of exchange rate changes	(240)	(531)
Projected benefit obligation at end of the year	14,527	12,349
Provision for gratuity (included in total current liabilities)	1,899	387
Provision for gratuity (included in non-current liabilities)	8,099	8,050
Defined Benefit Pension Plan, Liabilities	9,998	8,437
Net actuarial loss	1,353	489
Net prior service cost	106	134
Total accumulated other comprehensive loss	$ 1,459	$ 623