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Long-Term Debt - Schedule of long term debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2021	Nov. 30, 2019
Debt Instrument [Line Items]
Long-term debt, amount	$ 1,244,095	$ 1,256,962
Current portion	425,768	432,242
Non-current portion	818,327	824,720
Total	1,244,095	1,256,962
Term loan
Debt Instrument [Line Items]
Long-term debt, amount	495,705	508,867
Total	495,705	508,867
2019 Senior notes
Debt Instrument [Line Items]
Long-term debt, amount	399,609	399,464
Total	399,609	399,464
2021 Senior notes
Debt Instrument [Line Items]
Long-term debt, amount	348,781	348,631
Total	348,781	348,631
Genpact Luxembourg S.r.l. | 2019 Senior notes
Debt Instrument [Line Items]
Long-term debt, amount	399,609	399,464
Total	$ 399,609	399,464
Interest rate on senior notes (in percentage)	3.375%			3.375%
Genpact Luxembourg S.r.l. | 2021 Senior notes
Debt Instrument [Line Items]
Long-term debt, amount	$ 348,781	348,631
Total	$ 348,781	$ 348,631
Interest rate on senior notes (in percentage)	1.75%		1.75%

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