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Securities Amount Number of classes of common stock outstanding Number Of Classes Of Common Stock Outstanding Number Of Classes Of Common Stock Outstanding Maximum outstanding term of cash flow hedges Maximum Length of Time Hedged in Cash Flow Hedge Accumulated Other Comprehensive Income/( Loss) Comprehensive Income (Loss) Note [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Forecast Forecast [Member] 2024 (April 1 - December 31) Long-Term Debt, Maturity, Remainder of Fiscal Year Payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Operating lease liabilities, less current portion Operating lease liabilities - Non-current Operating Lease, Liability, Noncurrent Share-Based compensation arrangement by share-based payment award, purchase period Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period Share-Based Compensation Arrangement By Share-based Payment Award, Purchase 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Retained earnings Retained Earnings (Accumulated Deficit) Current assets: Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Mutual funds Mutual Funds, Asset, Fair Value Disclosure Mutual Funds, Asset, Fair Value Disclosure Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Total lease payments Finance Lease, Liability, to be Paid Schedule of Revenues from External Customers and Property, Plant and Equipment [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Digital operations and solutions Digital Operations And Solutions Services [Member] Digital Operations And Solutions Services Stock repurchase program, prepayment shares delivered Stock Repurchase Program, Prepayment Shares Delivered Stock Repurchase Program, Prepayment 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Plan Name [Axis] Plan Name [Axis] Value added tax, bank guarantees Value Added Tax, Bank Guarantees Value Added Tax, Bank Guarantees Debt Disclosure [Abstract] Debt Disclosure [Abstract] Market Condition Based PRSUs Market Condition Based Performance Restricted Stock Units [Member] Market Condition Based Performance Restricted Stock Units [Member] Income tax benefit related to share-based compensation Share-Based Payment Arrangement, Expense, Tax Benefit Earnings per share attributable to ExlService Holdings, Inc. stockholders: Earnings Per Share [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Common stock, $0.001 par value; 400,000,000 shares authorized, 204,734,988 shares issued and 162,425,610 shares outstanding as of March 31, 2024 and 203,410,038 shares issued and 165,277,880 shares outstanding as of December 31, 2023 Common Stock, Value, Issued Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Reduction in the carrying amount of operating lease right-of-use assets Operating Lease, Right-of-Use Asset, Periodic Reduction Income tax effects on above Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Performance based percentage Percentage Of Performance Criteria Achieved And Shares Vested Percentage Of Performance Criteria Achieved And Shares Vested Principal payments of finance lease liabilities Financing cash outflows for finance leases Finance Lease, Principal Payments Schedule of Maturities of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer 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[Abstract] Other Income, net Other Income and Other Expense Disclosure [Text Block] Accounts receivable not billed Unbilled Contracts Receivable Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] 2029 and thereafter Finance Lease, Liability, to be Paid, Due after Year Four Finance Lease, Liability, to be Paid, Due after Year Four Hedging Designation [Domain] Hedging Designation [Domain] (Level 2) Fair Value, Inputs, Level 2 [Member] Property and Equipment, Net Based on Geographical Information Long-Lived Assets by Geographic Areas [Table Text Block] Proceeds from borrowings Proceeds from Issuance of Other Long-Term Debt Summary of Effect of Foreign Currency Exchange Contracts on Consolidated Statements of Income/(Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive 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Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Revenues Based on Geographical Information Revenue from External Customers by Geographic Areas [Table Text Block] Total bank guarantees and deposits in respect of contingencies Total Bank Guarantees And Deposits In Respect Of Contingencies Total Bank Guarantees and Deposits in Respect of Contingencies Right of use assets under finance leases, gross Property and equipment, gross Finance Lease, Right-of-Use Asset, before Accumulated Amortization City Area Code City Area Code Product and Service [Axis] Product and Service [Axis] Earnings Per Share Earnings Per Share [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Unrealized gain/(loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Software Software and Software Development Costs [Member] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Goodwill and Intangible Assets Disclosure [Abstract] Total Liabilities, Fair Value Disclosure Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Income taxes Income Taxes Paid, Net Developed technology Developed Technology Rights [Member] Costs Related to Company's Stock-Based Compensation Plan Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total liabilities and stockholders’ equity Liabilities and Equity Other assets Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Operating lease right-of-use assets Operating lease ROU assets Operating Lease, Right-of-Use Asset Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Restructuring and related cost, number of positions eliminated, period percent Restructuring and Related Cost, Number of Positions Eliminated, Period Percent Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] 2024 (April 1 - December 31) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Corridor Platforms, Inc Corridor Platforms, Inc [Member] Corridor Platforms, Inc Arrangement Duration Trading Arrangement Duration Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Related Party Related Party [Member] Revenues and Cost of Revenues for Company's Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] 2022 Repurchase Program Two Thousand Twenty Two Repurchase Program [Member] Two Thousand Twenty Two Repurchase Program Termination Date Trading Arrangement Termination Date Common stock, shares authorized (in shares) Common Stock, Shares Authorized Amortization expense Capitalized Computer Software, Amortization Total including shares held in treasury Stockholders Equity Including Shares Held In Treasury Total stockholders' equity including shares held in treasury. 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Terminated [Flag] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accrued employee costs Employee-related Liabilities, Current Name Trading Arrangement, Individual Name Retirement benefits Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Revenues, net Revenues, net Revenue from Contract with Customer, Excluding Assessed Tax Amendment Flag Amendment Flag Fair value hedge Fair Value Hedging [Member] Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Share Match Units Share Match Units [Member] Share Match Units Operating lease Operating Lease, Weighted Average Discount Rate, Percent Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Share-based compensation arrangement by share-based payment award, shares issued in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Assets Assets, Fair Value Disclosure [Abstract] Long-term borrowings, less current portion Long-term borrowings Long-Term Debt, Excluding Current Maturities Finance lease Finance Lease, Weighted Average Remaining Lease Term Leasehold improvements Leasehold Improvements [Member] Actual return Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Selling and marketing expenses Selling and Marketing Expense [Member] Payable to statutory authorities Statutory Authority Payables, Current Statutory Authority Payables, Current Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Cost Capitalized Computer Software, Gross Operating expenses: Operating Expenses [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Finance lease: Lease, Cost 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