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Earnings Per Share - Schedule of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share (Abstract)
Net income available to Genpact Limited common shareholders	$ 85,698	$ 60,841
Weighted average number of common shares used in computing basic earnings per common share	190,626,757	189,451,845
Dilutive effect of stock-based awards	5,905,756	3,942,363
Weighted average number of common shares used in computing dilutive earnings per common share	196,532,513	193,394,208
Basic	$ 0.45	$ 0.32
Diluted	$ 0.44	$ 0.31

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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