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Document and Entity Information
9 Months Ended
Sep. 30, 2013
Oct. 28, 2013
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q3  
Trading Symbol G  
Entity Registrant Name GENPACT LTD  
Entity Central Index Key 0001398659  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   230,183,725