Commitments and Contingencies Disclosure [Abstract] Contingencies Contingencies Disclosure [Text Block] Income Tax Disclosure [Abstract] Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Computation of Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-based Compensation, Allocation and Classification in Financial Statements Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] 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] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue Cost of Sales [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Allocation of share-based compensation expense to income statement line items Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Pre-tax share-based compensation Allocated Share-based Compensation Expense Less: Income tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Total share-based compensation expense, net of tax Allocated Share-based Compensation Expense, Net of Tax Share-Based Compensation Expense, Aggregate Disclosures Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] Total unrecognized compensation cost related to restricted stock, stock options and the ESPP ($) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining weighted-average period over which the unrecognized compensation cost related to restricted stock, stock options and the ESPP will be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property and equipment Property, Plant and Equipment, Type [Domain] Computers and equipment Machinery and Equipment [Member] Computer software Software and Software Development Costs [Member] Furniture and fixtures Furniture and Fixtures [Member] Buildings and leasehold improvements Building and Building Improvements [Member] Land Land [Member] Office facility build outs Office Facility Build Outs [Member] Office facility build outs in process Data center build outs Data Center Build Outs [Member] Data center build outs in process Capitalized software and other projects Software Development [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] Data center in the U.K. real estate project Real Estate Project, Data Center in the U.K. [Member] Real Estate Project - a Data Center in the U.K. [Member] Property and equipment Property, Plant and Equipment [Line Items] Property and equipment, net Property, Plant and Equipment, Net, by Type [Abstract] Estimated useful lives Property, Plant and Equipment, Useful Life Property and equipment, at cost Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Work in process Work in Process Amount of physical assets that are not yet ready to place into service as work is still in process. Property and equipment, net Property, Plant and Equipment, Net Construction costs placed into service Property, Plant and Equipment, Additions Interest capitalized Interest Costs Capitalized Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Current assets: Assets, Current [Abstract] Allowance for doubtful accounts and customer credits Allowance For Doubtful Accounts Receivable And Customer Credits Current A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible, as well as estimated customer credits. Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Composition of equity awards outstanding Outstanding Stock Awards [Table Text Block] Total outstanding stock awards, by type of award. Allocation of share-based compensation expense to income statement line items Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Property and Equipment Property, Plant and Equipment [Table Text Block] Net Income Per Share Earnings Per Share [Text Block] Basic net income per share: Earnings Per Share, Basic [Abstract] Net income Net Income (Loss) Attributable to Parent Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Common stock Weighted Average Number of Shares Issued, Basic Number of shares used in per share computations Weighted Average Number of Shares Outstanding, Basic Net income per share - basic Earnings Per Share, Basic Diluted net income per share: Earnings Per Share, Diluted [Abstract] Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Common stock Stock options, awards and employee share purchase plans Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Number of shares used in per share computations Weighted Average Number of Shares Outstanding, Diluted Net income per share - diluted Earnings Per Share, Diluted Number of potential common shares excluded from the computation of dilutive net income per share because the effect would have been anti-dilutive Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Leases [Abstract] Build-to-Suit Leases Leases of Lessee Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Taxes and Tax Credits Share-based compensation expense Share-based Compensation Excess tax benefits from share-based compensation arrangements Excess Tax Benefit from Share-based Compensation, Operating Activities Other operating activities Other Operating Activities, Cash Flow Statement Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other current assets Increase (Decrease) in Other Current Assets Accounts payable, accrued expenses, and other current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Deferred rent Increase (Decrease) in Deferred Rent The increase (decrease) during the reporting period in the liability reflecting rental expense, recognized on a straight-line basis, for which cash or other forms of consideration have not yet been paid. Other non-current assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Productive Assets All other investing activities Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Principal payments of capital and build-to-suit leases Repayments of Long-term Capital Lease Obligations Repayments of debt Repayments of Debt Payments for deferred acquisition obligations Payments of Merger Related Costs, Financing Activities Receipt of Texas Enterprise Fund grant Receipt of Texas Enterprise Fund Grant The cash inflow associated with the amount received from the Texas Enterprise Fund Grant during the period. Shares of common stock withheld for employee taxes Payments Related to Tax Withholding for Share-based Compensation Proceeds from employee stock plans Proceeds from Stock Plans Excess tax benefits from share-based compensation arrangements Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Cash payments for interest, net of amount capitalized Interest Paid, Net Cash payments for income taxes, net of refunds Income Taxes Paid, Net Sale Leaseback Transaction [Table] Build-to-suit construction projects that have failed sale leaseback Build-to-suit construction projects that have failed sale leaseback [Member] Build-to-suit construction projects that have failed sale leaseback. Reclassified from capital lease obligations to finance lease obligations for build-to-suit leases Scenario, Reclassification [Member] Scenario, Reclassification [Member] Build-to-Suit Leases Sale Leaseback Transaction [Line Items] Finance lease obligations for build-to-suit leases Finance Lease Obligations for Build-to-Suit Leases Finance lease obligations for build-to-suit leases. Company Overview, Basis of Presentation, and Summary of Significant Accounting Policies [Abstract] Company Overview, Basis of Presentation, and Summary of Significant Accounting Policies [Abstract] Company Overview, Basis of Presentation, and Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Stock Options Employee Stock Option [Member] Restricted Stock Restricted Stock [Member] Employee Stock Purchase Plan Employee Stock [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Certain key executives Executive Officer [Member] Date [Axis] Date [Axis] Date [Axis] Date [Domain] Date [Domain] [Domain] for Date [Axis] Grant Date Grant Date [Member] Grant Date [Member] Enrollment Date Enrollment Date [Member] Enrollment Date [Member] Purchase Date Purchase Date [Member] Purchase Date [Member] Share-Based Compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Purchase price of common stock, as a percentage of market value Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Award expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Expected term of award Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Restricted stock Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Total outstanding awards Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Outstanding, Number The total of the number of equity-based payment instruments that validly exist and are outstanding as of the balance sheet date. Statement of Comprehensive Income [Abstract] Net revenue Sales Revenue, Services, Net Costs and expenses: Costs and Expenses [Abstract] Cost of revenue Cost of Services, Excluding Depreciation, Depletion, and Amortization Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total costs and expenses Costs and Expenses Income from operations Operating Income (Loss) Other income (expense): Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest and other income (expense) Other Nonoperating Income (Expense) Total other income (expense) Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income taxes Income Tax Expense (Benefit) Net income Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net income per share Earnings Per Share, Basic and Diluted [Abstract] Basic Diluted Weighted average number of shares outstanding Basic Diluted Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Foreign Currency Foreign Currency [Abstract] Income tax expense allocated to foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax Non-cash Investing and Financing Activities Noncash Investing and Financing Items [Abstract] Noncash or Part Noncash Acquisitions [Table] Noncash or Part Noncash Acquisitions by Unique Description [Axis] Non-cash purchases of property and equipment Noncash or Part Noncash Acquisition, Name [Domain] Acquisition of property and equipment by capital leases Capital Lease Obligations [Member] Increase (decrease) in property and equipment in accounts payable and accrued expenses Accounts Payable and Accrued Liabilities [Member] Non-Cash Purchases of Property and Equipment Noncash or Part Noncash Acquisitions [Line Items] Non-cash purchases of property and equipment Noncash or Part Noncash Acquisition, Fixed Assets Acquired Additional finance lease obligations for build-to-suit leases and other Additional Finance Lease Obligations for Build-to-Suit Leases and Other Additional finance lease obligations for build-to-suit leases and other non-cash transactions. ASSETS Assets [Abstract] Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts and customer credits of $5.3 as of December 31, 2014 and $6.5 as of March 31, 2015 Accounts Receivable, Net, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Prepaid expenses Prepaid Expense, Current Other current assets Other Assets, Current Total current assets Assets, Current Property and equipment, net Goodwill Intangible assets, net Finite-Lived Intangible Assets, Net Other non-current assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable and accrued expenses Accounts Payable and Other Accrued Liabilities, Current Accrued compensation and benefits Employee-related Liabilities, Current Income and other taxes payable Taxes Payable, Current Deferred revenue Deferred Revenue, Current Capital lease obligations Capital Lease Obligations, Current Debt Long-term Debt, Current Maturities Total current liabilities Liabilities, Current Non-current liabilities: Liabilities, Noncurrent [Abstract] Deferred revenue Deferred Revenue, Noncurrent Capital lease obligations Capital Lease Obligations, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Deferred rent Deferred Rent Credit, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Common stock, $0.001 par value per share: 300,000,000 shares authorized; 140,945,171 shares issued and outstanding as of December 31, 2014; 142,694,732 shares issued and outstanding as of March 31, 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accounting Policies [Abstract] Basis of Consolidation Consolidation, Policy [Policy Text Block] Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Real Estate Held for Development and Sale Real Estate Held for Development and Sale, Policy [Policy Text Block] Contingencies Commitments and Contingencies, Policy [Policy Text Block]