Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Due in one year or less Available-for-sale Securities, Current Due in one to two years Available-for-sale Securities, Noncurrent Total available for sale short-term and long-term securities Available-for-sale Securities Disclosure Intangible Assets As Direct Result From Cadent Acquisition [Abstract] Disclosure - Intangible Assets as Direct Result from Cadent Acquisition [Abstract] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Trademarks Trademarks [Member] Existing technology Existing Technology [Member] Existing Technology [Member] Customer relationships Customer Relationships [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount, beginning balance Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Period Increase Decrease Finite-Lived Intangible Assets, Accumulated Amortization, Period Increase (Decrease) Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Net Carrying Value, ending balance Finite-Lived Intangible Assets, Net Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Disclosure Warranty Accrual Activity [Abstract] Disclosure - Warranty Accrual Activity [Abstract] Accounts Payable and Accrued Liabilities [Table] Accounts Payable And Accrued Liabilities [Table] Accounts Payable and Accrued Liabilities [Table] Accounts Payable and Accrued Liabilities [Line Items] Accounts Payable And Accrued Liabilities [Line Items] Accounts Payable and Accrued Liabilities [Line Items] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual Charged to cost of revenues Standard Product Warranty Accrual, Warranties Issued Actual warranty expenditures Standard Product Warranty Accrual, Payments Balance at end of period Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average fair value at grant date (USD per Share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Asset Impairment Charges Asset Impairment Charges Impairment of goodwill Goodwill, Impairment Loss Maturity Period Used To Classify Investments Maturity Period Used To Classify Investments Maturity Period Used to Classify Investments Marketable Securities, Weighted Average Remaining Maturity Marketable Securities, Weighted Average Remaining Maturity Marketable Securities, Weighted Average Remaining Maturity Disclosure Summary Of Nonvested Shares [Abstract] Disclosure - Summary of Nonvested Shares [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Underlying RSUs Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested as of December 31, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested as of September 30, 2013 Weighted Remaining Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Nonvested as of September 30, 2013 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Term 1 Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term 1 Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Nonvested as of September 30, 2013 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Intrinsic Value Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value Disclosure Short Term And Long Term Marketable Securities [Abstract] Disclosure - Short-Term and Long-Term Marketable Securities [Abstract] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Short-term Investments Short-term Investments [Member] Long-term Investments Long Term Investments [Member] Long Term Investments [Member] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Corporate bonds Corporate Bonds [Member] Corporate Bonds [Member] U.S. dollar dominated foreign corporate bonds [Member] Foreign Corporate Debt Securities [Member] Commercial paper Commercial Paper [Member] Municipal Securities [Member] Municipal Securities [Member] Municipal Securities [Member] Agency bonds Agency Securities [Member] Asset-backed Securities [Member] Asset-backed Securities [Member] US Treasury and Government [Member] US Treasury and Government [Member] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available For Sale Securities Gross Unrealized Gain In Investments Available For Sale Securities Gross Unrealized Gain In Investments Gross Unrealized Losses Available For Sale Securities Gross Unrealized Loss In Investments Available For Sale Securities Gross Unrealized Loss In Investments Notes To Financial Statements [Abstract] Notes to Financial Statements [Abstract] Summary of Goodwill by Reportable Segment Schedule of Goodwill [Table Text Block] Schedule Of Amortized Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Income Statement [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Net revenues Revenue, Net Cost of net revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Profit from operations Operating Income (Loss) Interest and other income (expense), net Nonoperating Income (Expense) Net profit before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net profit (loss) Net Income (Loss) Attributable to Parent Net profit (loss) per share: Earnings Per Share [Abstract] Basic (in usd per share) Earnings Per Share, Basic Diluted (in usd per share) Earnings Per Share, Diluted Shares used in computing net profit (loss) per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Effective Income Tax Rate, Continuing Operations Effective Income Tax Rate Reconciliation, Percent Market Performance Based Restricted Stock Units Market Performance Based Restricted Stock Units [Member] Market Performance Based Restricted Stock Units [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Stock-based Compensation Expense Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Statement of Comprehensive Income [Abstract] Net profit (loss) Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in unrealized gains (losses) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net change in accumulated other comprehensive income (losses) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disclosure Segments And Geographical Information Additional Information [Abstract] Disclosure - Segments and Geographical Information - Additional Information [Abstract] Number of reportable segments Number of Reportable Segments Disclosure Long Lived Assets By Geographic Area [Abstract] Disclosure - Long-Lived Assets by Geographic Area [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES the Netherlands NETHERLANDS Other international Other International [Member] Other International [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Long-lived assets Long-Lived Assets Disclosure Credit Facilities Additional Information [Abstract] Disclosure - Credit Facilities - Additional Information [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Letter of Credit [Member] Letter of Credit [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo [Member] Wells Fargo [Member] Wells Fargo [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit, available borrowings Line of Credit Facility, Maximum Borrowing Capacity Unrestricted Cash Deposit Unrestricted Cash Deposit Unrestricted cash deposit. Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Line of Credit Facility, Amount Outstanding Line of Credit Facility, Amount Outstanding Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Disclosure Net Revenues By Geographic Area [Abstract] Disclosure - Net Revenues by Geographic Area [Abstract] Disclosure Balance Sheet Components Additional Information [Abstract] Disclosure - Balance Sheet Components - Additional Information [Abstract] Schedule of Product Information [Table] Schedule of Product Information [Table] Product Information [Line Items] Product Information [Line Items] Scanners, Warranty period Standard Product Warranty Time Period Standard Product Warranty Time Period Disclosure Stock Based Compensation Expense Related To All Stock Based Awards And Employee Stock Purchases [Abstract] Disclosure - Stock-Based Compensation Expense Related to All Stock-Based Awards and Employee Stock Purchases [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] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of Sales [Member] Cost of Sales [Member] Selling and Marketing Expense [Member] Selling and Marketing Expense [Member] General and Administrative Expense [Member] General and Administrative Expense [Member] Research and development Research and Development Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net profit (loss) Adjustments to reconcile net profit to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred taxes Deferred Income Tax Expense (Benefit) Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Excess tax benefit from share-based payment arrangements Excess Tax Benefit from Share-based Compensation, Operating Activities Provision for Doubtful Accounts Provision for Doubtful Accounts Other Noncash Income (Expense) Other Noncash Income (Expense) Changes in assets and liabilities, net of acquired assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued and other long-term liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue 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] Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Purchase of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Purchase of marketable securities Payments to Acquire Available-for-sale Securities Maturities of marketable securities Proceeds from Sale and Maturity of Available-for-sale Securities Proceeds from Sale of Available-for-sale Securities Proceeds from Sale of Available-for-sale Securities Other assets 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] Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Common stock repurchase Payments for Repurchase of Common Stock Excess tax benefit from share-based payment arrangements Excess Tax Benefit from Share-based Compensation, Financing Activities Employees' taxes paid upon the vesting of restricted stock units Payments Related to Tax Withholding for Share-based Compensation Other payments for financing activities Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of the period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of the period Net Profit Per Share Earnings Per Share [Text Block] Disclosure Summary Of Goodwill By Reportable Segment [Abstract] Disclosure - Summary of Goodwill by Reportable Segment [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Clear Aligner [Member] Clear Aligner [Member] Clear Aligner [Member] Scanners and CAD/CAM Services Scanners And CADCAM [Member] Scanners and CAD and CAM [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill Goodwill Schedule Of Earnings Per Share Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Legal Proceedings [Abstract] Legal Proceedings [Abstract] Legal Proceedings [Text Block] Legal Proceedings [Text Block] Legal Proceedings [Text Block] Marketable Securities and Fair Value Measurements Financial Instruments Disclosure [Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Disclosure Computation Of Basic And Diluted Net Profit Per Share Attributable To Common Stock [Abstract] Disclosure - Computation of Basic and Diluted Net Profit Per Share Attributable to Common Stock [Abstract] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Table] Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted-average common shares outstanding, basic (in shares) Dilutive effect of potential common stock (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Total shares, diluted Net profit (loss) per share, basic Net profit (loss) per share, diluted Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts and returns Allowance For Doubtful Accounts Receivable And Sales Returns Current Allowance For Doubtful Accounts Receivable And Sales Returns Current Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, par value (in usd per share) 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 Common Stock Repurchase Program Share Repurchase Program Disclosure [Text Block] Share Repurchase Program Disclosure Disclosure Accounting For Income Taxes Additional Information [Abstract] Disclosure - Accounting for Income Taxes - Additional Information [Abstract] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Foreign Tax Authority [Member] Foreign Tax Authority [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Income tax expense (benefit) related to googdwill and long-lived assets Income Tax Expense (Benefit), Impairment Losses, Amount Income Tax Expense (Benefit), Impairment Losses, Amount Discrete benefit Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Income tax expense Income Tax Expense (Benefit), Nondeductible Expense, Impairment Losses, Amount Income Tax Expense (Benefit), Nondeductible Expense, Impairment Losses, Amount Income Tax Benefit Deductible, Impairment Losses, Amount Income Tax Benefit Deductible, Impairment Losses, Amount Income Tax Benefit Deductible, Impairment Losses, Amount Tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Valuation allowance, deferred tax asset Deferred Tax Assets, Valuation Allowance Unrecognized tax benefits Unrecognized Tax Benefits Foreign income tax rate Effective Income Tax Reconciliation, at Foreign Income Tax Rate Effective Income Tax Reconciliation, at Foreign Income Tax Rate Tax Holiday effect Effective Income Tax Rate Reconciliation, Tax Holiday, Amount Tax holiday effect on diluted earnings per share Effective Income Tax Rate Reconciliation, Tax Holiday, Effect on Diluted Earnings Per Share Effective Income Tax Rate Reconciliation, Tax Holiday, Effect on Diluted Earnings Per Share Disclosure Common Stock Repurchase Program Additional Information [Abstract] Disclosure - Common Stock Repurchase Program - Additional Information [Abstract] Share Repurchases [Table] Share Repurchases [Table] Share Repurchases [Table] Share Repurchases, by Program [Axis] Share Repurchases By Program [Axis] Share Repurchases, by Program [Axis] Share Repurchases, by Program [Domain] Share Repurchases By Program [Domain] Share Repurchases, by Program [Domain] Common Stock Repurchase Program Common Stock Repurchase Program [Member] Common Stock Repurchase Program [Member] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Share Repurchases [Line Items] Share Repurchases [Line Items] Share Repurchases [Line Items] Repurchase of common stock, common stock authorized Stock Repurchase Program, Authorized Amount Repurchase of common stock, shares repurchased Stock Repurchased During Period, Shares Repurchase of common stock, average price per share Share Repurchases Price Paid Per Share Share Repurchases, Price Paid Per Share Repurchase of common stock, aggregate purchase price Stock Repurchased During Period, Value Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements Recent Accounting Pronouncements [Policy Text Block] Recent accounting pronouncements , Policy [Text Block] Accounting for Income Taxes Income Tax Disclosure [Text Block] Disclosure Accrued Liabilities [Abstract] Disclosure - Accrued Liabilities [Abstract] Schedule of Accrued Liabilities [Table] Schedule Of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Line Items] Schedule Of Accrued Liabilities [Line Items] Schedule of Accrued Liabilities [Line Items] Accrued payroll and benefits Employee-related Liabilities, Current Accrued sales rebate Accrued Marketing Costs, Current Accrued sales tax and value added tax Sales and Excise Tax Payable, Current Accrued warranty Standard Product Warranty Accrual, Current Accrued sales and marketing expenses Accrued Sales And Marketing Current Accrued Sales and Marketing, Current Accrued accounts payable Accrued Accounts Payable Accrued Accounts Payable Accrued professional fees Accrued Professional Fees, Current Accrued income taxes Accrued Income Taxes, Current Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Business Combinations [Abstract] Business Combination Disclosure Business Combination Disclosure [Text Block] Schedule of Future Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Disclosure Total Estimated Annual Future Amortization Expense For Acquired Intangible Assets [Abstract] Disclosure - Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets [Abstract] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] Remainder of 2013 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Future Amortization Expense Thereafter Future Amortization Expense, Thereafter Disclosure Segment Information [Abstract] Disclosure - Segment Information [Abstract] Invisalign Full [Member] Invisalign Full [Member] Invisalign Full [Member] Invisalign ExpressLite [Member] Invisalign ExpressLite [Member] Invisalign Express/Lite [Member] Invisalign Teen [Member] Invisalign Teen [Member] Invisalign Teen [Member] Invisalign Assist [Member] Invisalign Assist [Member] Invisalign Assist [Member] Invisalign Non-Case Revenues [Member] Invisalign Non-Case Revenues [Member] Invisalign Non-Case Revenues [Member] Scanners [Member] Scanners [Member] Scanners [Member] CADCAM Services [Member] CADCAM Services [Member] CADAndCAM Services [Member] Revenue Gross profit ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Marketable securities, short-term Available-for-sale Securities, Debt Securities, Current Accounts receivable, net of allowances for doubtful accounts, credit reserves and returns of $1,724 and $3,167, respectively Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Marketable securities, long-term Available-for-sale Securities, Debt Securities, Noncurrent Property, plant and equipment, net Property, Plant and Equipment, Net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Deferred revenues Deferred Revenue, Current Total current liabilities Liabilities, Current Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value (5,000 shares authorized; none issued) Preferred Stock, Value, Issued Common stock, $0.0001 par value (200,000 shares authorized; 80,114 and 80,611 issued and outstanding at 2013 and 2012, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] ICA Holdings Pty Limited [Member] ICA Holdings Pty Limited [Member] ICA Holdings Pty Limited [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to acquire business Payments to Acquire Businesses, Gross Assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Document Documentand Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Document Information [Line Items] Document Information [Line Items] Trading Symbol Trading Symbol 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 Goodwill and Intangible Asset Impairment [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Property, Plant, Equipment [Member] Property, Plant, Equipment [Member] Property, Plant, Equipment [Member] Impairment of fixed assets Impairment of Long-Lived Assets Held-for-use Disclosure Net Profit Per Share Additional Information [Abstract] Disclosure - Net Profit per Share - Additional Information [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract] Disclosure - Minimum Future Lease Payments for Non-Cancelable Leases [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Remainder of 2013 Operating Leases Future Minimum Payments Due Remainder Of Period Operating Leases, Future Minimum Payments Due, Remainder of Period 2014 Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments, Due in Three Years 2016 Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Warranty Accrual Schedule of Product Warranty Liability [Table Text Block] Disclosure Summary Of M S U Performance [Abstract] Disclosure - Summary of MSU Performance [Abstract] Number of Shares Underlying MSUs Weighted Average Remaining Vesting Period Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Short-Term And Long-Term Marketable Securities Available-for-sale Securities [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Financial Assets Measured At Fair Value On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Segments and Geographical Information Segment Reporting Disclosure [Text Block] Disclosure Activity Under Stock Option Plans [Abstract] Disclosure - Activity Under Stock Option Plans [Abstract] Number of Shares Underlying Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding as of December 31, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding as of September 30, 2013 Vested and expected to vest at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding as of September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Vested and expected to vest at March 31, 2013 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable at March 31, 2013 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Outstanding as of September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Outstanding as of September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable at September 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Credit Facilities Debt Disclosure [Text Block] Disclosure Stockbased Compensation Additional Information [Abstract] Disclosure - Stock-based Compensation - Additional Information [Abstract] Selling and Marketing Expense [Member] Research and Development Expense [Member] Employee Stock Purchase Plan 2010 Employee Stock Purchase Plan 2010 [Member] Employee Stock Purchase Plan, 2010 [Member] Stock Options Employee Stock Option [Member] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Share Based Compensation Arrangements By Share Based Payment Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Incentive Plan 2005 Stock Incentive Plan 2005 [Member] 2005 Stock Incentive Plan [Member] Amended And Restated 2005 Stock Incentive Plan Amended And Restated 2005 Stock Incentive Plan [Member] Amended And Restated 2005 Stock Incentive Plan [Member] Minimum Minimum [Member] Maximum Maximum [Member] Approved increase in shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Shares reserved for issuance Common Stock, Capital Shares Reserved for Future Issuance Total unamortized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period of total unamortized cost (in years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Vesting period of granted market-performance based restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage of market-performance based restricted stock units eligible to vest over the vesting period Percentage Of Market Performance Based Restricted Stock Units During Vesting Period Maximum percentage of market-performance based restricted stock units during vesting period. Maximum number of shares available Employee Stock Purchase Plan Number Of Shares Available For Issuance Employee Stock Purchase Plan, Number Of Shares Available for Issuance Number of shares remaining Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Disclosure Change In Carrying Value Of Goodwill [Abstract] Disclosure - Change in Carrying Value of Goodwill [Abstract] Goodwill [Roll Forward] Goodwill [Roll Forward] Balance as of December 31, 2012 Goodwill from ICA acquisition Goodwill, Acquired During Period Impairment of goodwill Adjustments 1 Goodwill, Translation and Purchase Accounting Adjustments Balance as of September 30, 2013 Disclosure Summary Of Financial Assets Measured At Fair Value On Recurring Basis [Abstract] Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Cash Equivalents Cash Equivalents [Member] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Money market funds Money Market Funds [Member] US Government Agency Bonds [Member] US Government Agency Bonds [Member] US Government Agency Bonds [Member] Corporate bonds Corporate Bond Securities [Member] Foreign bonds Foreign Government Debt Securities [Member] Israeli Severance Funds Israeli Severance Funds [Member] Israeli Severance Funds [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investments Other assets Other Assets, Fair Value Disclosure Assets, Fair Value Disclosure Assets, Fair Value Disclosure Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Disclosure Inventories [Abstract] Disclosure - Inventories [Abstract] Schedule of Inventory [Table] Schedule Of Inventory [Table] Schedule of Inventory [Table] Schedule of Inventory [Line Items] Schedule Of Inventory [Line Items] Schedule of Inventory [Line Items] Inventory, Raw Materials, Net of Reserves Inventory, Raw Materials, Net of Reserves Inventory, Work in Process, Net of Reserves Inventory, Work in Process, Net of Reserves Inventory, Finished Goods, Net of Reserves Inventory, Finished Goods, Net of Reserves Inventories