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Long-Term Debt - Narrative (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2021
Nov. 30, 2019
Debt Instrument [Line Items]            
Margin over LIBOR (in percentage) 1.375%          
Net debt to EBITDA leverage ratio, covenant line of credit   300.00%        
Interest coverage minimum ratio, covenant line of credit   3        
Long-term debt, amount   $ 1,244,095,000 $ 1,256,962,000      
Term loan            
Debt Instrument [Line Items]            
Debt amortization expense   1,170,000 1,258,000      
Long-term debt, amount   495,705,000 $ 508,867,000      
Principal amount of term loan   $ 6,625,000        
2022 facility | Minimum            
Debt Instrument [Line Items]            
Term SOFR adjustment (in percentage)   0.00% 0.00%      
2022 facility | Maximum            
Debt Instrument [Line Items]            
Term SOFR adjustment (in percentage)   0.10% 0.10%      
2022 facility | Line of credit            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 650,000,000    
2022 facility | Term loan            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 530,000,000    
Amended 2015 facility            
Debt Instrument [Line Items]            
Margin over LIBOR (in percentage)     0.20%      
Credit facility, base rate (in percentage)     0.375%      
2019 Senior notes            
Debt Instrument [Line Items]            
Long-term debt, amount   $ 399,609,000 $ 399,464,000      
2019 Senior notes | Genpact Luxembourg S.r.l.            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 400,000,000
Debt amortization expense   391,000 536,000      
Long-term debt, amount   $ 399,609,000 399,464,000      
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            
Debt Instrument [Line Items]            
Long-term debt, amount   $ 348,781,000 348,631,000      
2021 Senior notes | Genpact Luxembourg S.r.l.            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 350,000,000  
Debt amortization expense   1,219,000 1,369,000      
Long-term debt, amount   $ 348,781,000 $ 348,631,000      
Interest rate on senior notes (in percentage)   1.75%     1.75%  
Total debt issuance cost         $ 3,032,000