Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Assets Noncurrent Disclosure [Abstract]
Customer acquisition cost	$ 30,996	$ 13,458
Advance income and non-income taxes	60,203	50,123
Deferred transition costs	74,462	56,759
Deposits	29,853	24,107
Derivative instruments	20,657	12,096
Prepaid expenses	3,179	4,435
Accounts receivable due after one year	3,272	8,348
Others	19,706	10,679
Other assets	$ 242,328	$ 180,005