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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 25, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-33089    
Entity Registrant Name EXLSERVICE HOLDINGS, INC.    
Entity Central Index Key 0001297989    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-0572194    
Entity Address, Address Line One 320 Park Avenue,    
Entity Address, Address Line Two 29th Floor,    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
City Area Code 212    
Local Phone Number 277-7100    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol  EXLS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,189,025,465
Entity Common Stock, Shares Outstanding   34,364,691  
Documents Incorporated by Reference
Part III incorporates information from certain portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission within 120 days after the fiscal year end of December 31, 2019.