Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Advance income and non-income taxes	$ 50,676	$ 52,953
Deferred transition costs	45,252	36,620
Derivative instruments	34,730	18,284
Prepaid expenses	22,222	12,565
Customer acquisition cost	11,126	6,687
Employee advances	6,880	3,878
Deposits	2,688	1,820
Advances to suppliers	10,059	8,028
Others	5,516	13,190
Prepaid expenses and other current assets, net	$ 189,149	$ 154,025