Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable, net Accrued expenses and other current liabilities. Accrued Expenses And Other Current Liabilities [Member] Accrued Expenses and Other Current Liabilities [Member] Accrued expenses. Accrued Expenses Current Accrued expenses Accrued Liabilities Current Accrued expenses and other current liabilities Accrued expenses and other current liabilities Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Excluding Capital Leased Assets Less: Accumulated depreciation and amortization Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Acquired Finite Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Additional Paid In Capital Additional paid-in-capital Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer, net of carrying amount as of the balance sheet date of the unpaid sum of known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Advance Income Tax Net Advance income tax, net Aggregate disputed amount related to transfer pricing. Aggregate Disputed Amount Related To Transfer Pricing Aggregate disputed amount Allocated Share Based Compensation Expense Total Amendment Flag Amendment Flag Amortization Of Debt Discount Premium Amortization of debt issuance cost Amortization Of Intangible Assets Amortization expense Amounts paid as deposits in respect of Contingencies. Amounts Paid As Deposits In Respect Of Contingencies Amounts paid as deposits in respect of Contingencies Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Weighted average common shares considered anti-dilutive in computing diluted earnings per share Assets Total assets Assets [Abstract] Assets Assets Current Total current assets Assets Current [Abstract] Current assets: Assets Fair Value Disclosure Total Assets Fair Value Disclosure [Abstract] Assets Award Type [Axis] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Bank guarantee issued. Bank Guarantee Issued Bank guarantee issued Basis Of Accounting Policy Policy [Text Block] Basis of Presentation Building [Member] Buildings [Member] Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business acquisition cost of acquired entity purchase price. Business Acquisition Cost Of Acquired Entity Purchase Price Table [Text Block] Summary of Total Purchase Price of Acquisitions Business acquisition deferred tax assets operating loss carry forwards. Business Acquisition Deferred Tax Assets Operating Loss Carryforwards Deferred tax assets recognized for the acquired federal and state net operating losses Business Acquisition Effective Date Of Acquisition 1 Acquisition of Landacorp, Inc. Business acquisition initial purchase price allocation goodwill amount. Business Acquisition Initial Purchase Price Allocation Goodwill Amount Goodwill, Initial Allocation Business acquisition initial purchase price allocation intangible assets Other than goodwill. Business Acquisition Initial Purchase Price Allocation Intangible Assets Other Than Goodwill Identifiable intangible assets, Initial Allocation Business acquisition initial purchase price allocation net tangible assets. Business Acquisition Initial Purchase Price Allocation Net Tangible Assets Net tangible assets, Initial Allocation Landacorp has more than 50 million members under management on its platforms. Business Acquisition Number Of Shareholders In Acquired Entity Description Number of members in a company Business acquisition purchase price allocation escrow deposit. Business Acquisition Purchase Price Allocation Escrow Deposit Escrow accounts in connection with the acquisition Business Acquisition Purchase Price Allocation Intangible Assets [Abstract] Business Acquisition Purchase Price Allocation Intangible Assets [Abstract] Assets Business Combination Disclosure [Text Block] Business Combinations, Goodwill and Intangible Assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Goodwill Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Goodwill Goodwill, Revised Allocation Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Other Than Goodwill Net tangible assets, Revised Allocation Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangibles Identifiable intangible assets, Revised Allocation Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Total purchase price Total purchase price Business Combinations [Abstract] Business Combinations [Abstract] Business Combinations Policy Business Combinations Capital Leased Assets Gross Capital Leased Assets, Gross Capital Lease Obligations Current Current portion of capital lease obligations Less: current portion Capital Lease Obligations Noncurrent Capital lease obligations, less current portion Long term capital lease obligation Capital Leases Balance Sheet Assets By Major Class Net Assets under capital leases, net Capital Leases Balance Sheet Assets By Major Class Net Lessee Balance Sheet [Abstract] Assets under capital leases: Capital Leases Future Minimum Payments Due Total minimum lease payments Capital Leases Future Minimum Payments Due Current 2014 Capital Leases Future Minimum Payments Due In Four Years 2017 Capital Leases Future Minimum Payments Due In Three Years 2016 Capital Leases Future Minimum Payments Due In Two Years 2015 Capital Leases Future Minimum Payments Interest Included In Payments Less: amount representing interest Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Present value of minimum lease payments Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation Less: Accumulated depreciation and amortization The changes in capital structure of the company. Capital Structure [Text Block] Capital Structure Cash And Cash Equivalents At Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net increase in cash and cash equivalents Cash Flow Hedging [Member] Derivatives in Cash Flow Hedging Relationships [Member] Commitments And Contingencies Commitments and contingencies (See Note 15) Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments And Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock, $0.001 par value; 100,000,000 shares authorized, 33,066,381 shares issued and 32,717,101 shares outstanding as of June 30, 2013 and 32,540,082 shares issued and 32,203,820 shares outstanding as of December 31, 2012 Compensation And Retirement Disclosure [Abstract] Compensation and Retirement Disclosure [Abstract] Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Total comprehensive (loss)/income Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation Policy [Text Block] Principles of Consolidation Construction In Progress [Member] Capital Work in Progress [Member] Contribution to various defined contribution plans. Contribution To Various Defined Contribution Plans Table [Text Block] Contribution to Various Defined Contribution Plans Cost Of Goods And Services Sold Depreciation And Amortization Depreciation and amortization expense Cost Of Revenue Cost of revenues (exclusive of depreciation and amortization) Cost Of Sales [Member] Cost of Revenue [Member] Current Fiscal Year End Date Current Fiscal Year End Date Customer Relationships [Member] Customer Relationships [Member] Deferred income taxes related to the Minimum Alternative Tax (MAT) expiration year. Deferred Income Taxes Related To Minimum Alternative Tax Expiration Year Deferred income taxes related to the MAT expiration year Deferred Income Tax Expense Benefit Deferred income taxes Deferred Rent Credit Deferred rent Deferred Rent Credit Noncurrent Deferred rent Deferred Revenue Current Deferred revenue Deferred Tax Assets Net Current Deferred tax assets, net Deferred Tax Assets Net Noncurrent Deferred tax assets, net Deferred Tax Assets Tax Credit Carryforwards Deferred income taxes related to the MAT Deferred Tax Assets Valuation Allowance Valuation allowance Defined Benefit Plan Actual Return On Plan Assets Actual return Defined benefit plan actuarial gain loss included in net gratuity cost. Defined Benefit Plan Actuarial Gain Loss Included In Net Gratuity Cost Actuarial loss Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward] Change in Plan Assets Defined Benefit Plan Expected Return On Plan Assets Expected return on plan assets Defined benefit plan expected return on plan assets percentage. Defined Benefit Plan Expected Return On Plan Assets Percentage Percentage of expected return on the Gratuity Plans Defined Benefit Plan Fair Value Of Plan Assets Plan assets at June 30, 2013 Plan assets at January 1, 2013 Defined Benefit Plan Foreign Currency Exchange Rate Changes Plan Assets Effect of exchange rate changes Defined Benefit Plan Interest Cost Interest cost Defined Benefit Plan Net Periodic Benefit Cost Net gratuity cost Defined Benefit Plan Service Cost Service cost Defined Contribution Plan Cost Recognized Company's contribution to the 401(k) Plans Defined Contribution Plan Employer Discretionary Contribution Amount Contribution to various defined contribution plans Defined Contribution Plan Maximum Annual Contributions Per Employee Percent Percentage of discretionary contributions, Maximum Depreciation Depletion And Amortization Depreciation and amortization Derivative Contract Type [Domain] Derivative Contract [Domain] Derivative Fair Value Of Derivative Asset Foreign currency exchange contracts, Asset Derivative Fair Value Of Derivative Liability Foreign currency exchange contracts, Liability Derivative Gain Loss On Derivative Net Amount of Gain/(Loss) Recognized in Income on Derivatives Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Instruments And Hedges Liabilities Derivative instruments Derivative Instruments And Hedges Liabilities Noncurrent Derivative instruments Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivatives and Hedge Accounting Derivative Instruments Gain Loss By Hedging Relationship [Axis] Hedging Relationship [Axis] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments Gain Loss [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income Estimated Net Amount To Be Transferred Net derivative losses Derivative Instruments Gain Loss Reclassified From Accumulated O C I Into Income Effective Portion Net Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net Amount of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) Derivative loss included in accumulated other comprehensive loss reclassified into earnings period. Derivative Loss Included In Accumulated Other Comprehensive Loss Reclassified Into Earnings Period Period of accumulated other comprehensive loss reclassified into earnings Derivative Notional Amount Foreign exchange contracts outstanding Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] Designated As Hedging Instrument [Member] Derivatives Designated as Hedging Instruments [Member] Developed Technology Rights [Member] Developed Technology [Member] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Stock-Based Compensation Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award [Text Block] Restricted Stock and Restricted Stock Unit Activity Document Document and Entity Information [Abstract] Document Document And Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Earning Per Share Basic And Diluted Abstract Earning Per Share Basic And Diluted [Abstract] Earnings per share: Earnings Per Share [Abstract] Earnings per share: Earnings Per Share Basic Basic Earnings Per Share Diluted Diluted Earnings Per Share [Text Block] Earnings Per Share Effective Income Tax Rate Continuing Operations Effective tax rates Effective Income Tax Rate Reconciliation Tax Exempt Income Tax exemption on profit of the Company's Bengaluru operations Effect of exchange rate changes. Effect Of Exchange Rate Changes Effect of exchange rate changes Effect Of Exchange Rate On Cash And Cash Equivalents Effect of exchange rate changes on cash and cash equivalents Employee Related Liabilities Current Accrued employee cost Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1 Expected expensed over a weighted average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Unrecognized compensation cost for unvested options Employee Stock Option [Member] Stock Options [Member] Enterprise value. Enterprise Value Enterprise Value Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Entity Wide Information Revenue From External Customer [Line Items] Revenues and cost of revenues for Company's outsourcing services and transformation services segments [Line Items] Export oriented units established percentage. Export Oriented Units Established Percentage Export-Oriented units established percentage Extendable income tax holiday. Extendable Income Tax Holiday Extendable income tax holiday Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value By Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Inputs Level 1 [Member] Level 1 [Member] Fair Value Inputs Level 2 [Member] Level 2 [Member] Fair Value Inputs Level 3 [Member] Level 3 [Member] Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurement Inputs Disclosure [Text Block] Fair Value Measurements Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Measurements Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Option Quantitative Disclosures [Text Block] Fair Value of Each Stock Option Granted to Employees Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Finite Lived Intangible Assets Accumulated Amortization Accumulated Amortization Finite Lived Intangible Assets Amortization Expense Next Twelve Months 2014 Finite Lived Intangible Assets Amortization Expense Year Five 2018 Finite Lived Intangible Assets Amortization Expense Year Four 2017 Finite Lived Intangible Assets Amortization Expense Year Three 2016 Finite Lived Intangible Assets Amortization Expense Year Two 2015 Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Gross Gross Carrying Amount Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Net Net Carrying Amount Finite Lived Intangible Asset Useful Life Weighted average life of intangible assets Foreign Currency Contract Asset Fair Value Disclosure Derivative financial instruments Foreign Currency Contracts Liability Fair Value Disclosure Derivative financial instruments Foreign Currency Gain Loss [Member] Foreign Exchange Loss [Member] Foreign Currency Transaction Gain Loss Before Tax Foreign exchange loss Foreign Currency Transaction Gain Loss Unrealized Unrealized foreign exchange gain Foreign Exchange Contract [Member] Foreign Currency Exchange Contracts [Member] Furniture And Fixtures [Member] Office Furniture and Equipment [Member] Gain Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring Net Gain/(Losses) that reclassified from AOCI into earning as a result of forecasted transaction G B United Kingdom [Member] General And Administrative Expense General and administrative expenses General And Administrative Expense [Member] General and Administrative Expenses [Member] This element may be used to disclose in the entity's country of domicile and its entirety the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. This element also include amount of long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets, located in the entity's country of domicile and in foreign countries in total in which the entity holds assets. Geographical Information [Text Block] Geographical Information Goodwill Ending Balance Beginning Balance Goodwill Goodwill Acquired During Period Goodwill arising from Landacorp acquisition Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill [Line Items] Goodwill [Line Items] Goodwill Purchase Accounting Adjustments Purchase accounting adjustments Goodwill Translation Adjustments Currency translation adjustments Gross Profit Gross profit Gross profit Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Hedging Relationship [Domain] Hedging Relationship [Domain] I N India [Member] Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income before income taxes Income Statement [Abstract] Income Statement [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Taxes Income Tax Examination Penalties And Interest Expense Recognized interest and penalties Income Tax Expense Benefit Income tax expense Income tax provision Income tax holiday current benefits. Income Tax Holiday Current Benefits Company's current benefits from income tax holiday Income Tax Holiday Termination Date Income tax holiday expire Increase Decrease In Accounts Payable Accounts payable Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Income Taxes Payable Advance income tax, net Increase Decrease In Deferred Revenue Deferred revenue Increase Decrease In Operating Capital [Abstract] Change in operating assets and liabilities: Increase Decrease In Other Accounts Payable And Accrued Liabilities Accrued expenses and other liabilities Increase Decrease In Other Employee Related Liabilities Accrued employee cost Increase Decrease In Other Operating Assets Other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other current assets Increase Decrease In Restricted Cash Restricted cash Incremental Common Shares Attributable To Share Based Payment Arrangements Dilutive effect of share based awards Indefinite life trade names and trademarks. Indefinite Life Trade Names And Trademarks Indefinite life trade names and trademarks Intangible Assets Net Excluding Goodwill Intangible assets, net Landacorp Inc [Member] Landacorp Inc [Member] Landacorp Inc [Member] Land [Member] Land [Member] Leasehold benefits. Leasehold Benefits [Member] Leasehold benefits [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Leases [Abstract] Leases [Abstract] Leases Of Lessee Disclosure [Text Block] Leases Liabilities Total liabilities Liabilities And Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity [Abstract] Liabilities and Stockholders' Equity Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Liabilities Fair Value Disclosure Total Liabilities Fair Value Disclosure [Abstract] Liabilities Liabilities Noncurrent Non-current liabilities Non-current liabilities Liabilities Noncurrent [Abstract] Summary of non-current liabilities Long Lived Assets By Geographic Areas Table [Text Block] Fixed Assets, Net Based on Geographical Information Maximum outstanding term of derivative instruments. Maximum Outstanding Term Of Derivative Instruments Maximum outstanding term of derivative instruments Minority Interest Non-controlling interest Money market and mutual fund fair value disclosure. Money Market And Mutual Fund Fair Value Disclosure Money market and mutual funds Net Cash Provided By Used In Financing Activities Net cash provided by financing activities Net Cash Provided By Used In Financing Activities [Abstract] Cash flows from financing activities: Net Cash Provided By Used In Investing Activities Net cash used for investing activities Net Cash Provided By Used In Investing Activities [Abstract] Cash flows from investing activities: Net Cash Provided By Used In Operating Activities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities [Abstract] Cash flows from operating activities: Net Income Loss Net income Net income Net Income Loss [Abstract] Numerators: Net Income Loss Attributable To Noncontrolling Interest Non-controlling interest Network equipment computers and software. Network Equipment Computers And Software [Member] Network Equipment, Computers and Software [Member] New Accounting Pronouncements Policy Policy [Text Block] Recent Accounting Pronouncements Noncompete Agreements [Member] Non-compete agreements [Member] Nondesignated [Member] Derivatives not Designated as Hedging Instruments [Member] Non employee stock options expense. Non Employee Stock Options Expense Non-employee stock options Nonoperating Income Expense [Abstract] Other income/(expense): Number of year of expected extendable period. Number Of Year Of Expected Extendable Period Number of year of expected extendable period Number of year of extended retroactive. Number Of Year Of Extended Retroactive Number of year of extended retroactive Operating Expenses Operating expenses Total operating expenses Operating Expenses [Abstract] Operating expenses: Operating Income Loss Income from operations Operating Leases Future Minimum Payments Due Total operating lease payments Operating Leases Future Minimum Payments Due Current 2014 Operating Leases Future Minimum Payments Due In Five Years 2018 Operating Leases Future Minimum Payments Due In Four Years 2017 Operating Leases Future Minimum Payments Due In Three Years 2016 Operating Leases Future Minimum Payments Due In Two Years 2015 Operating Leases Future Minimum Payments Due Thereafter 2019 and thereafter Operating Leases Rent Expense Net Rent expense under both cancellable and non-cancellable operating leases Operating Segments [Member] Operating Segments [Member] Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Organization and Basis of Presentation Other Assets Current Other current assets Other Assets [Member] Other Assets [Member] Other Assets Noncurrent Other assets Other Commitment Due In Next Twelve Months Purchase commitments, net of advances Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract] Reclassification adjustments Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax Retirement benefits, net of taxes $9, $7, $17 and $14, respectively Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Foreign currency translation adjustment Other Comprehensive Income Loss Net Of Tax Total other comprehensive loss Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive loss: Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax Realized loss on cash flow hedges, net of taxes $361, $1,328, $789 and $1,432 Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Tax Taxes on realized loss on cash flow hedges Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax Retirement benefits, taxes Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Unrealized loss on effective cash flow hedges, net of taxes ($2,315), ($3,590), ($1,689) and ($1,490), respectively Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax Taxes on unrealized loss on cash flow hedges Other Current Assets [Member] Other Current Assets [Member] Other Liabilities Current Other current liabilities Other Liabilities Noncurrent Other non-current liabilities Other Noncurrent Liabilities [Member] Other Non Current Liabilities [Member] Other Nonoperating Income Expense Interest and other income, net Other Operating Income Expense Net Other income/(expense) Outsourcing Services [Member] Outsourcing Services [Member] Outsourcing Services [Member] Payables And Accruals [Abstract] Payables and Accruals [Abstract] Payment of bank guarantee. Payment Of Bank Guarantee Bank Guarantees provided Payments For Repurchase Of Common Stock Acquisition of treasury stock Payments Related To Tax Withholding For Share Based Compensation Withholding tax payments related to the vesting of restricted stock for total consideration Payments To Acquire Businesses Net Of Cash Acquired Business acquisition (net of cash acquired) Payments To Acquire Property Plant And Equipment Purchase of fixed assets Payments To Acquire Short Term Investments Purchase of short-term investments Pension And Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent Retirement benefits Period completed by business operation. Period Completed By Business Operation Period completed by Bengaluru operation P H Philippines [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Preferred Stock Par Or Stated Value Per Share Preferred stock, par value Preferred Stock Shares Authorized Preferred stock, shares authorized Preferred Stock Shares Issued Preferred stock, shares issued Preferred Stock Value Preferred stock, $0.001 par value; 15,000,000 shares authorized, none issued Prepaid Expense Current Prepaid expenses Proceeds From Sale Of Short Term Investments Proceeds from redemption of short-term investments Proceeds From Stock Options Exercised Proceeds from exercise of stock options Product Or Service [Axis] Products and Services [Axis] Products And Services [Domain] Products and Services [Domain] Property Plant And Equipment [Abstract] Property, Plant and Equipment [Abstract] Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Disclosure [Text Block] Fixed Assets Property Plant And Equipment Gross Excluding Capital Leased Assets Assets, Gross Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Property Plant And Equipment Net Fixed assets, net Fixed assets, net Total Fixed assets Property Plant And Equipment Net [Abstract] Fixed assets, net Property Plant And Equipment Net Excluding Capital Leased Assets Owned Assets, net Property Plant And Equipment Net Excluding Capital Leased Assets [Abstract] Owned Assets: Property Plant And Equipment [Text Block] Components of Fixed Assets, Net of Accumulated Depreciation Property Plant And Equipment Type [Domain] Property, Plant and Equipment, Type [Domain] Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification Out Of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Repayments Of Long Term Capital Lease Obligations Principal payments on capital lease obligations Reportable Geographical Components [Member] Reportable Geographical Components [Member] Rest of World. Rest Of World [Member] Rest of World [Member] Restricted Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash And Cash Equivalents Noncurrent Restricted cash Restricted Stock [Member] Restricted Stock [Member] Restricted stock shares acquired net of shares for tax withholdings. Restricted Stock Shares Acquired Net Of Shares For Tax Withholdings Acquisition of restricted stock from employees in connection with withholding tax payments Restricted Stock Units R S U [Member] Restricted Stock Units [Member] Retained Earnings Accumulated Deficit Retained earnings Revenues [Abstract] Revenues Revenues From External Customers And Long Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Sales Revenue Net Revenues Schedule of accrued expenses and other current liability. Schedule Of Accrued Expenses And Other Current Liability Table [Text Block] Summary of Accrued Expenses and Other Current Liabilities Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] Schedule Of Business Acquisitions Purchase Price Allocation [Line Items] Schedule Of Business Acquisitions Purchase Price Allocation [Table] Schedule Of Business Acquisitions Purchase Price Allocation [Table] Schedule Of Business Acquisitions Purchase Price Allocation [Table] Schedule of change in plan assets. Schedule Of Change In Plan Assets Table [Text Block] Change in Plan Assets Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance [Text Block] Summary of Effect of Foreign Currency Exchange Contracts on Consolidated Statements of Income Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Computation of Basic and Diluted Earnings per Share Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Costs Related to Company Stock-Based Compensation Plan Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Table] Revenue from External Customers by Products and Services [Table] Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Assets and Liabilities Measured at Fair Value Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Estimated Amortization of Intangible Assets Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets Table [Text Block] Summary of Company's Intangible Assets Schedule Of Foreign Exchange Contracts Statement Of Financial Position Table [Text Block] Summary of Fair Value of Foreign Currency Exchange Contracts Schedule Of Future Minimum Lease Payments For Capital Leases Table [Text Block] Future Minimum Lease Payments under Capital Leases Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Future Minimum Lease Payments under Non-Cancelable Operating Lease Agreements Expiring after More Than Twelve Months Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Schedule Of Goodwill [Text Block] Summary of Company's Goodwill Schedule Of Net Benefit Costs Table [Text Block] Net Gratuity Cost Schedule of non-current liability. Schedule Of Non Current Liability Table [Text Block] Summary of Non-current Liabilities Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block] Summary of Purchase Price Allocation for Acquisitions Schedule Of Revenues From External Customers And Long Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of revenues from external customers by geographical areas. Schedule Of Revenues From External Customers By Geographical Areas Table [Text Block] Revenues Based on Geographical Information Schedule Of Segment Reporting Information By Segment [Text Block] Revenues and Cost of Revenues for Company's Outsourcing Services and Transformation Services Segments Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Share Based Compensation Stock Options Activity A summary of unrecognized tax benefits recognized during the period. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. Schedule Of Unrecognized Tax Benefits Table [Text Block] Summary of Activity Related to Gross Unrecognized Tax Benefits Segment Geographical [Domain] Geographical [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Information Selling And Marketing Expense Selling and marketing expenses Selling And Marketing Expense [Member] Selling and Marketing Expenses [Member] Share Based Compensation Stock-based compensation expense Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Number, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Intrinsic Value Weighted-Average Intrinsic Value, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Number, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Intrinsic Value Weighted-Average Intrinsic Value, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Intrinsic Value Weighted-Average Intrinsic Value, Outstanding, Ending Balance Weighted-Average Intrinsic Value, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Number, Outstanding, Ending Balance Number, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Number, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Intrinsic Value Weighted-Average Intrinsic Value, Vested Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Dividend yield Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term 1 Expected weighted average period Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Risk free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate Volatility Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share based compensation arrangement by share based payment award non option equity instruments vested in period. Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Vested In Period Restricted stock units vested during the year for which underlying common stock to be issued Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Available for grant at June 30, 2013 Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Number of Options, Forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Number of Options, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value Outstanding, Ending Balance Aggregate Intrinsic Value Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of Options, Outstanding, Ending Balance Number of Options, Outstanding, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-Average Exercise Price, Outstanding, Ending Balance Weighted-Average Exercise Price, Outstanding, Beginning Balance Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term 2 Weighted Average Remaining Contractual Life (Years) Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value Aggregate Intrinsic Value, Vested and exercisable at June 30, 2013 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price Options vested and exercisable, Weighted Average Exercise Price Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term 1 Expected life (years) Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Number of Options, Vested and exercisable at June 30, 2013 Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term 1 Weighted Average Remaining Contractual Life (Years) Vested and Exercisable at June 30, 2013 Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value 1 Total fair value of options vested in period Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price, Forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-Average Exercise Price, Granted Share Price Common stock price per share Short Term Investments Short-term investments Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Statement Geographical [Axis] Geographical [Axis] Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement Of Income And Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Stockholders Equity ExlService Holdings, Inc. stockholders' equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total stockholders' equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Stockholders' equity: Total stockholders' equity including shares held in treasury. Stockholders Equity Including Shares Held In Treasury Total stockholders' equity including shares held in treasury Stock Issued During Period Shares Stock Options Exercised Number of Options, Exercised Tax Benefit Expiration Date Tax Benefit Expiration Date Tax benefit expiration date Text Block [Abstract] Text Block [Abstract] Trademarks And Trade Names [Member] Trade Names and Trademarks [Member] Trading Symbol Trading Symbol Transfer pricing establishment issues ending period. Transfer Pricing Establishment Issues Ending Period Transfer pricing establishment issues ending period Transfer pricing establishment issues starting period. Transfer Pricing Establishment Issues Starting Period Transfer pricing establishment issues starting period Transfer pricing issues ending period. Transfer Pricing Issues Ending Period Transfer pricing issues ending period Transfer pricing issues starting period. Transfer Pricing Issues Starting Period Transfer pricing issues starting period Transformation Services [Member] Transformation Services [Member] Transformation Services [Member] Treasury Stock Shares Treasury stock, shares Treasury Stock Value Less: 349,280 shares as of June 30, 2013 and 336,262 shares as of December 31, 2012, held in treasury, at cost Two thousand three plan. Two Thousand Three Plan [Member] 2003 Plan [Member] Unrecognized Tax Benefits Balance as of June 30, 2013 Balance as of January 1, 2013 Unrecognized tax benefits Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions Decreases related to current year tax positions Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions Decreases related to prior year tax positions Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions Increases related to current year tax positions Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions Increases related to prior year tax positions Unrecognized Tax Benefits That Would Impact Effective Tax Rate Unrecognized tax benefits U S United States [Member] Use Of Estimates Use of Estimates Vehicles [Member] Motor Vehicles [Member] Weighted average fair value of options granted. Weighted Average Fair Value Of Options Granted Weighted average fair value of options granted Weighted Average Number Of Diluted Shares Outstanding Diluted Diluted weighted average common shares outstanding Weighted Average Number Of Shares Outstanding [Abstract] Denominators: Weighted-average number of shares used in computing earnings per share: Weighted Average Number Of Shares Outstanding Basic Basic Basic weighted average common shares outstanding Working capital baseline and other adjustments as of the acquisition date. Working Capital Baseline And Other Adjustments As Of Acquisition Date Add: Working capital adjustments