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Long-term debt - Schedule of long term debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Nov. 30, 2019
Debt Instrument [Line Items]
Total	$ 1,275,289	$ 1,655,909
Current portion	26,136	383,433
Non-current portion	$ 1,249,153	1,272,476
Genpact Luxembourg S.r.l. | 2017 senior notes
Debt Instrument [Line Items]
Interest rate on senior notes (in percentage)	3.70%
Genpact Luxembourg S.r.l. | 2019 senior notes
Debt Instrument [Line Items]
Total	$ 398,881	398,298
Interest rate on senior notes (in percentage)	3.375%			3.375%
Genpact Luxembourg S.r.l. | 2021 senior notes
Debt Instrument [Line Items]
Total	$ 348,030	347,429
Interest rate on senior notes (in percentage)	1.75%		1.75%
Credit facility, net of debt amortization expenses
Debt Instrument [Line Items]
Total	$ 528,378	560,313
2017 senior notes
Debt Instrument [Line Items]
Total	0	349,869
2019 senior notes
Debt Instrument [Line Items]
Total	398,881	398,298
2021 senior notes
Debt Instrument [Line Items]
Total	$ 348,030	$ 347,429

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