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Segment Reporting - Schedule of revenue and adjusted income from operations by reporting segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]        
Net revenues   $ 4,022,211 $ 3,709,377 $ 3,520,543
Adjusted income from operations   662,680 588,808 558,841
Stock-based compensation   (81,968) (74,008) (83,885)
Amortization and impairment of acquired intangible assets (other than included above)   (57,641) (43,648) (31,458)
Acquisition-related expenses   (1,177) (2,650) (8,352)
Foreign exchange gains (losses), net   12,669 7,482 7,729
Interest income (expense), net $ (51,434) (51,434) (48,960) (43,458)
Restructuring expenses     (26,547)  
Income tax expense   (113,681) (92,201) (94,536)
Net income attributable to Genpact Limited shareholders   369,448 308,276 304,881
BCMI        
Segment Reporting Information [Line Items]        
Accelerated charge of contract cost asset       10,524
Adjusted income from operations net of accelerated charge of contract cost asset       105,474
Reportable segments        
Segment Reporting Information [Line Items]        
Net revenues   4,005,473 3,732,673 3,535,013
Adjusted income from operations   650,491 574,302 515,642
Reportable segments | BCMI        
Segment Reporting Information [Line Items]        
Net revenues   1,016,786 1,079,193 1,078,844
Adjusted income from operations   126,972 132,939 115,998
Reportable segments | CGRLH        
Segment Reporting Information [Line Items]        
Net revenues   1,509,534 1,264,654 1,107,534
Adjusted income from operations   250,765 197,197 161,515
Reportable segments | HMS        
Segment Reporting Information [Line Items]        
Net revenues   1,479,153 1,388,826 1,348,635
Adjusted income from operations   272,754 244,166 238,129
Others        
Segment Reporting Information [Line Items]        
Net revenues   16,738 (23,296) (14,470)
Adjusted income from operations   $ 12,189 $ 14,506 43,199
Adjusted income from operations before accelerated charge of contract cost asset       $ 53,723