Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Accrued employee cost	$ 3,976	$ 6,901
Deferred transition revenue	72,560	66,737
Retirement benefits	39,020	29,689
Derivative instruments	12,576	25,010
Amount received from GE under indemnification arrangement, pending adjustment	3,159	3,549
Advance from customers	2,371	4,485
Earn-out consideration	15,550	5,924
Others	11,078	10,729
Capital lease obligations	2,500	2,204
Other Liabilities	$ 162,790	$ 155,228