Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net revenues	$ 2,570,756	$ 2,461,044	$ 2,279,438
Cost of revenue	1,554,707	1,493,547	1,378,088
Gross profit	1,016,049	967,497	901,350
Operating expenses:
Selling, general and administrative expenses	653,029	608,114	585,646
Amortization of acquired intangible assets	27,183	28,513	28,543
Other operating (income) expense, net	(4,940)	(3,322)	(6,870)
Income from operations	340,777	334,192	294,031
Foreign exchange gains (losses), net	2,630	5,269	(12,363)
Interest income (expense), net	(16,184)	(31,267)	(29,395)
Other income (expense), net	10,120	4,360	2,112
Income before equity-method investment activity, net and income tax expense	337,343	312,554	254,385
Gain (loss) on equity-method investment activity, net	(7,698)	(10,800)	(4,795)
Income before income tax expense	329,645	301,754	249,590
Income tax expense	62,098	61,937	57,419
Net income	267,547	239,817	192,171
Net loss (income) attributable to non-controlling interest/ redeemable non-controlling interest	2,137		(169)
Net income attributable to Genpact Limited shareholders	269,684	239,817	192,002
Net income available to Genpact Limited common shareholders	$ 269,684	$ 239,817	$ 192,002
Earnings per common share attributable to Genpact Limited common shareholders
Basic	$ 1.30	$ 1.11	$ 0.87
Diluted	$ 1.28	$ 1.09	$ 0.85
Weighted average number of common shares used in computing earnings per common share attributable to Genpact Limited common shareholders
Basic	206,861,536	216,606,542	220,847,098
Diluted	210,126,023	219,145,044	225,168,665