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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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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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