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Controlling Interest Noncontrolling Interest [Member] Depreciation and amortization expense Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Domestic Current Federal, State and Local, Tax Expense (Benefit) Net prior service cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Derivative Contract [Domain] Derivative Contract [Domain] Schedule of Credit Facilities Carried an Effective Interest Rate Schedule of Line of Credit Facilities [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Office furniture and equipment Furniture and Fixtures [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Others Other Assets, Miscellaneous, Current Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Basic (in shares) Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Bank guarantee issued Bank Guarantee Issued Bank Guarantee Issued Service cost Defined Benefit Plan, Service Cost Net actuarial loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Income taxes, net of refunds Income Taxes Paid, Net Non-deductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Investment in equity affiliate Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total Non-United States Non-US [Member] Finance lease: Lease, Cost [Abstract] Schedule of Amortization of Intangible Assets Finite-lived Intangible Assets Amortization Expense [Table Text Block] Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intangible assets, net Total intangible assets, net carrying amount Intangible Assets, Net (Excluding Goodwill) Deferred revenue (consideration received in advance) Contract with Customer, Liability Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Cash paid during the year for: Interest Paid, Including Capitalized Interest, Operating and Investing Activities [Abstract] Other comprehensive income/(loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Borrowings Debt, Policy [Policy Text Block] Deferred tax liabilities, net Deferred Income Tax Liabilities, Net 2022 Repurchase Program Two Thousand Twenty Two Repurchase Program [Member] Two Thousand Twenty Two Repurchase Program State taxes, net of Federal taxes Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Other non-current liabilities Other Noncurrent Liabilities [Member] Common stock issued (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Summary of Effective Income Tax Rate Differs from Amount Computed by Applying U.S. Federal Statutory Income Tax Rate to Income Before Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts payable Accounts Payable, Current Total including shares held in treasury Stockholders Equity Including Shares Held In Treasury Total stockholders' equity including shares held in treasury. Long-lived assets impairment charges Impairment, Long-Lived Asset, Held-for-Use Depreciation and amortization expense Depreciation, Depletion and Amortization Weighted average purchase price per share (in dollars per share) Accelerated Share Repurchases, Final Price Paid Per Share Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Other Income, net Interest and Other Income [Text Block] Schedule of Supplemental Cash Flow Information Related to Leases Schedule Of Supplemental Cash Flow And Other Information, Leases [Table Text Block] Schedule of Statement of Cash Flows, Supplemental Disclosures [Table Text Block] Accumulated Other Comprehensive Income/(Loss) Total AOCI Attributable to Parent [Member] Other assets Other Assets Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Reduction in ROU assets Increase (Decrease) In Operating Lease Assets Increase (Decrease) In Operating Lease Assets Others Other Sundry Liabilities, Noncurrent Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Entity Central Index Key Entity Central Index Key Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total lease cost Lease, Cost Range of exercise prices, upper range limit (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit ExlService Holdings, Inc. Stockholders’ equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Decreases related to prior year tax positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Customer relationships Customer Relationships [Member] Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Prepaid expenses Other Prepaid Expense, Current Other non-current liabilities Other non-current liabilities Other Liabilities, Noncurrent Projected benefit obligation as of January 1 Projected benefit obligation as of December 31 Defined Benefit Plan, Benefit Obligation Cost Capitalized Computer Software, Gross Schedule of Company's Debt Position Schedule of Long-term Debt Instruments [Table Text Block] Acquisition of treasury stock (in shares) Shares repurchased (in shares) Treasury Stock, Shares, Acquired Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Derivative instruments Derivative Asset Income tax effects on amortization of actuarial (gain)/loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Others Deferred Tax Liabilities, Other Other assets Increase (Decrease) in Other Operating Assets Finance Lease Finance Leases [Abstract] Finance Leases [Abstract] Number of options, vested and exercisable at December 31, 2021 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 2018 Stock Options Plan Two Thousand Eighteen Stock Options Plan [Member] Two Thousand Eighteen Stock Options Plan [Member] Line of Credit Facility [Table] Line of Credit Facility [Table] Retirement benefits Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Impairment of Long-lived Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Long-term borrowings, less current portion Long-term borrowings Long-term Debt, Excluding Current Maturities Liabilities Liabilities, Fair Value Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Stock-based compensation expenses Share-based Payment Arrangement, Expense Client liabilities Broker-Dealer, Payable to Customer Foreign income Income (Loss) from Continuing Operations After Income Taxes, Foreign Income (Loss) from Continuing Operations After Income Taxes, Foreign Earnings per share attributable to ExlService Holdings Inc. stockholders: Earnings Per Share, Basic and Diluted [Abstract] Effect of foreign exchange gains Gain (Loss) on Hedging Activity Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Restricted cash Restricted cash (current) Restricted Cash, Current Summary of Components of Income /(Loss) Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Capital work in progress Construction in Progress [Member] Cash, cash equivalents and restricted cash at the beginning of the year Cash, cash equivalents and restricted cash at the end of the year Cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Healthcare Healthcare [Member] Healthcare Gross Carrying Amount Finite-Lived Intangible Assets, Gross Right-of-use assets under finance leases: Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract] Schedule of Finite Lived Intangible Assets Useful Lives Schedule of Finite-Lived Intangible Assets [Table Text Block] Amortization expense Capitalized Computer Software, Amortization Cash and cash equivalents (money market funds) Cash and Cash Equivalents, Fair Value Disclosure Stock issued against stock-based compensation plans (in shares) Stock issued, stock-based compensation plans (in shares) Number of options, exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Total other comprehensive income/(loss) Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Interest payable Interest Payable, Current Payable to statutory authorities Statutory Authority Payables, Current Statutory Authority Payables, Current Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Capital Structure Stockholders' Equity Note Disclosure [Text Block] Reductions due to write-off of Accounts Receivables Accounts Receivable, Allowance for Credit Loss, Writeoff Unrealized gain on cash flow hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Other Current Assets Other Current Assets [Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five Contract Acquisition and Fulfillment Costs Capitalized Contract Cost [Table Text Block] Auditor Firm ID Auditor Firm ID Investment in equity affiliate Payments to Acquire Equity Method Investments Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Change in benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Change in operating assets and liabilities, net of effects of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Weighted-average fair value, vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Deferred tax provision Deferred Other Tax Expense (Benefit) Cash payments for amounts included in the measurement of lease liabilities : Cash Flow, Operating Activities, Lessee [Abstract] Reclassification adjustment for cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Performance Based Stock Awards Performance Based Stock Awards [Member] Performance Based Stock Awards [Member] Operating cash outflows for finance leases Finance Lease, Interest Payment on Liability Line of credit , maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Owned Assets: Property, Plant and Equipment, Net, Excluding Capital Leased Assets [Abstract] Revenue Based PRSUs Revenue Based Performance Restricted Stock Units [Member] Revenue Based Performance Restricted Stock Units [Member] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Credit Facilities [Line Items] Line of Credit Facility [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Long-lived assets Long-Lived Assets Other current assets Other current assets Other Assets, Current Cost of revenues Cost of revenues Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Foreign currency exchange contracts, liability Derivative Liability, Fair Value, Gross Liability Impairment and Restructuring Charges Restructuring, Impairment, and Other Activities Disclosure [Text Block] Gain on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Options outstanding, vested and exercisable (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Cost of revenues Cost of Sales [Member] Income taxes payable, net Accrued Income Taxes, Current Reclassification adjustment for retirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Maximum outstanding term of cash flow hedges Maximum Length of Time Hedged in Cash Flow Hedge Foreign Withholding taxes Current Foreign Tax Expense (Benefit) Right of use assets under finance leases, gross Property and equipment, gross Finance Lease, Right-of-Use Asset, before Accumulated Amortization Developed technology Developed Technology Rights [Member] Unamortized debt discount Debt Instrument, Unamortized Discount All Other Other Operations Management [Member] Other Operations Management [Member] Movement in Allowance for Expected Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Effective Interest Rate Line of Credit Facility, Interest Rate During Period Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table]