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Long-term debt - Narrative (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Nov. 30, 2019 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Margin over LIBOR (in percentage) | 1.375% | 1.375% | 1.375% |  |  |
Debt amount outstanding |  | $ 1,655,909,000 | $ 1,340,908,000 |  |  |
Term loan credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt amortization expense |  | 687,000 | 1,150,000 |  |  |
Debt amount outstanding |  | 560,313,000 | 593,850,000 |  |  |
Principal amount of term loan |  | 8,500,000 |  |  |  |
Amended 2015 Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Margin over LIBOR (in percentage) | 1.375% |  |  |  |  |
Credit facility, base rate (in percentage) | 0.375% |  |  |  |  |
2017 Senior Notes | Genpact Luxembourg S.r.l. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt amortization expense |  | 131,000 | 658,000 |  |  |
Debt amount outstanding |  | $ 349,869,000 | 349,342,000 |  |  |
Principal amount of senior notes issued |  |  |  |  |  | $ 350,000,000
Interest rate on senior notes (in percentage) |  | 3.70% |  |  |  | 3.70%
Total debt issuance cost |  |  |  |  |  | $ 2,642,000
2019 Senior Notes | Genpact Luxembourg S.r.l. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt amortization expense |  | $ 1,702,000 | 2,284,000 |  |  |
Debt amount outstanding |  | $ 398,298,000 | $ 397,716,000 |  |  |
Principal amount of senior notes issued |  |  |  |  | $ 400,000,000 |
Interest rate on senior notes (in percentage) |  | 3.375% |  |  | 3.375% |
Total debt issuance cost |  |  |  |  | $ 2,937,000 |
Debt instrument redemption price (in percentage) |  | 100.00% |  |  |  |
Debt repurchase price as percentage of aggregate principal value upon certain change of controls (in percentage) |  | 101.00% |  |  |  |
Maximum increase in downgrade of credit rating of notes to adjust interest rate payable (in percentage) |  | 2.00% |  |  |  |
2021 Senior Notes | Genpact Luxembourg S.r.l. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt amortization expense |  | $ 2,571,000 |  |  |  |
Debt amount outstanding |  | $ 347,429,000 |  |  |  |
Principal amount of senior notes issued |  |  |  | $ 350,000,000 |  |
Interest rate on senior notes (in percentage) |  | 1.75% |  | 1.75% |  |
Total debt issuance cost |  |  |  | $ 3,032,000 |  |

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