v3.25.2
Long-Term Debt - Narrative (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2021
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 $ 1,209,087,000 $ 1,221,440,000    
Term loan        
Debt Instrument [Line Items]        
Debt amortization expense 747,000 911,000    
Long-term debt, amount 463,002,000 476,089,000    
Principal amount of term loan $ 6,625,000      
2022 facility | Maximum        
Debt Instrument [Line Items]        
Term SOFR adjustment (in percentage) 0.10%      
2022 facility | Minimum        
Debt Instrument [Line Items]        
Term SOFR adjustment (in percentage) 0.00%      
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%      
2021 Senior notes        
Debt Instrument [Line Items]        
Long-term debt, amount $ 349,532,000 349,234,000    
2021 Senior notes | Genpact Luxembourg S.r.l.        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 350,000,000
Debt amortization expense 468,000 766,000    
Long-term debt, amount $ 349,532,000 349,234,000    
Interest rate on senior notes (in percentage) 1.75%     1.75%
Total debt issuance cost       $ 3,032,000
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%      
2024 Senior notes        
Debt Instrument [Line Items]        
Long-term debt, amount $ 396,553,000 396,117,000    
2024 Senior notes | Genpact Luxembourg S.r.l.        
Debt Instrument [Line Items]        
Interest rate on senior notes (in percentage) 6.00%      
2024 Senior notes | Genpact Luxembourg and Genpact USA        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 400,000,000  
Debt amortization expense $ 3,447,000 3,883,000    
Long-term debt, amount $ 396,553,000 $ 396,117,000    
Interest rate on senior notes (in percentage)     6.00%  
Total debt issuance cost     $ 4,395,000  
2019 Senior notes | Genpact Luxembourg S.r.l.        
Debt Instrument [Line Items]        
Maximum increase in downgrade of credit rating of notes to adjust interest rate payable (in percentage) 2.00%