Business Combinations Business Combinations Policy [Policy Text Block] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type Unit options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Other (income) expense, net Other Nonoperating Income (Expense) Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Components of Identifiable Indefinite-Lived Intangible Assets Acquired Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value First Lien Term Loan First Lien Term Loan [Member] First Lien Term Loan Level 3 Fair Value, Inputs, Level 3 [Member] Number of shares repurchased Stock Repurchased During Period, Shares Prior to February 1, 2024 Prior to February 1, 2024 [Member] Prior to February 1, 2024 Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities, Temporary, and Permanent Equity (Deficit) Liabilities and Equity [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Paid and accrued tax distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Less: Comprehensive income attributable to ZoomInfo OpCo prior to the Reorganization Transactions Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Prior to Reorganization Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Prior to Reorganization Repurchase outstanding equity / member units Payments for Repurchase of Other Equity Deferred tax liabilities Deferred Income Tax Liabilities, Net Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Security Exchange Name Security Exchange Name Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Proceeds from debt Proceeds from Issuance of Long-term Debt Sales and marketing Selling and Marketing Expense [Member] Income (loss) from operations Operating Income (Loss) Assets Assets, Lessee [Abstract] Assets, Lessee Total current liabilities Liabilities, Current Accounts Receivable and Contract Assets Accounts Receivable [Policy Text Block] Member distributions Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Variable Rate [Domain] Variable Rate [Domain] Variable Rate [Axis] Variable Rate [Axis] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and Contingencies Commitments and Contingencies Shares withheld related to net share settlement and other Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Quarterly vesting Share-based Payment Arrangement, Tranche Two [Member] Assets Assets [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Investment, Name [Axis] Investment, Name [Axis] Cash acquired Cash Acquired from Acquisition Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Accounting Policies [Abstract] Furniture and fixtures Furniture and Fixtures [Member] Issuance of Class A common stock upon vesting of RSUs Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Entity Address, State or Province Entity Address, State or Province Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Other comprehensive income (loss) before tax Other Comprehensive Income (Loss), before Tax Accounts payable Accounts Payable, Current Schedule of Cash and Cash Equivalents [Table] Schedule of Cash and Cash Equivalents [Table] Retained Earnings Retained Earnings (Accumulated Deficit) Operating lease right-of-use assets, net Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Tax benefits realized which must be paid (as a percent) Tax Receivable Agreement, Tax Benefits Realized Which Must Then Be Paid, Percentage Tax Receivable Agreement, Tax Benefits Realized Which Must Then Be Paid, Percentage Commissions payable, current Accrued Sales Commission, Current Cash, cash equivalents, and restricted cash at end of period: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Loss on early extinguishment of debt Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Amortization period Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Class B common stock Class B Common Class B [Member] Cash paid for taxes Income Taxes Paid 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Total unamortized equity-based compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Accelerated depreciation Restructuring and Related Cost, Accelerated Depreciation Benefit retained as percent of net cash savings Benefit Retained As Percent Of Net Cash Savings Benefit Retained As Percent Of Net Cash Savings Pre-IPO Awards Pre-IPO Awards [Member] Pre-IPO Awards Maturities of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-term Investments Income Taxes Income Tax, Policy [Policy Text Block] Hedging Designation [Domain] Hedging Designation [Domain] Total operating expenses Operating Expenses Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Technology Equipment Technology Equipment [Member] Payments of debt issuance and modification costs Payments of Financing Costs Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other long-term liabilities Other Liabilities, Noncurrent Deferred tax assets Deferred Income Tax Assets, Net Cost of service: Cost of Revenue [Abstract] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Percentage of principal amount that may be redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount That May Be Redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount That May Be Redeemed Equity-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Blocker Mergers Blocker Mergers [Member] Blocker Mergers Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Measurement Frequency [Domain] Measurement Frequency [Domain] Advertising expenses Advertising Expense Class P Units Class P Units [Member] Class P Units Thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Concentration risk (as a percent) Concentration Risk, Percentage 2020 Omnibus Incentive Plan Omnibus Incentive Plan, 2020 [Member] Omnibus Incentive Plan, 2020 Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] Unearned revenue Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue Statement [Line Items] Statement [Line Items] Expected benefit from remaining cash savings (as a percent) Tax Receivable Agreement, Cash Savings Realized, Percentage Tax Receivable Agreement, Cash Savings Realized, Percentage Potential Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Trigerring Events [Domain] Trigerring Events [Domain] Trigerring Events Class of Stock [Domain] Class of Stock [Domain] Net income (loss) per share of Class A and Class C common stock Earnings Per Share, Basic and Diluted [Abstract] Computer equipment Computer Equipment [Member] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Prepaid expenses and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Cost of service [Extensible List] Cost, Product and Service [Extensible List] Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Credit Facility [Axis] Credit Facility [Axis] Securities guaranteed by U.S. government US Government Agencies Debt Securities [Member] Israel ISRAEL Period to settle awards Share-Based Compensation By Share-Based Payment Award, Period To Settle Awards Share-Based Compensation By Share-Based Payment Award, Period To Settle Awards Measured on a non-recurring basis Fair Value, Nonrecurring [Member] Business Combinations [Abstract] Short-term Investments Marketable Securities, Policy [Policy Text Block] Performance vesting condition (more than) (as a percent) Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Vesting Condition, Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Vesting Condition, Percentage Entity Small Business Entity Small Business Organization and Principles of Consolidation Consolidation, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Number of shares sold Sale of Stock, Number of Shares Issued in Transaction Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Financing Arrangements Debt Disclosure [Text Block] Unit options exercisable, weighted average remaining term Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Number of Instruments Derivative, Number of Instruments Held Amendment Flag Amendment Flag Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Ownership interest in units (as a percent) Equity Method Investment, Ownership Percentage of Units Equity Method Investment, Ownership Percentage of Units Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Number of Units authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Research and Development Research and Development Expense, Policy [Policy Text Block] Fair Values of Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Total Carrying Value of Debt Long-term Line of Credit Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Payments for previous acquisition Payments for Previous Acquisition Realized loss (gain) on settlement of cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Forfeitures / cancellations (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Measurement Frequency [Axis] Measurement Frequency [Axis] Tax Receivable Agreements Tax Receivable Agreements Policy [Policy Text Block] Tax Receivable Agreements Policy Number of reporting units (segment) Number of Reporting Units Derivative Instrument [Axis] Derivative Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Commissions payable Accrued Sales Commission Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Other long-term liabilities Other Noncurrent Liabilities [Member] Total cash equivalents Cash Equivalents, at Carrying Value Senior Notes Senior Notes [Member] Income tax receivable Income Taxes Receivable, Current Geographical [Axis] Geographical [Axis] Tax Receivable Agreements [Abstract] Tax Receivable Agreements Unamortized equity-based compensation cost, options Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Leases Lessor, Leases [Policy Text Block] Statement of Cash Flows [Abstract] Tax receivable agreements liability, net of current portion Accrued Income Taxes, Noncurrent Allocation of net income (loss) attributable to ZoomInfo Technologies Inc. Undistributed earnings for basic computation Undistributed Earnings (Loss) Available to Common Shareholders, Basic Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Principal amount redeemed on February 1, 2026 Principal amount redeemed on February 1, 2026 [Member] Principal amount redeemed on February 1, 2026 Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Changes in fair value included in AOCI expected to be reclassified over the next 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Notional amount Notional Aggregate Principal Amount Derivative, Notional Amount Amortization expense Amortization of Intangible Assets From new and existing lease agreements and modifications Right-of-Use Asset Obtained in Exchange for Operating Lease Liability and Adjustments Right-of-Use Asset Obtained in Exchange for Operating Lease Liability and Adjustments Other Information Related to Leases Lease, Cost [Table Text Block] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Plan Name [Axis] Plan Name [Axis] Operating lease, lease not yet commenced, undiscounted amount Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount Total assets Assets Additional Details Related to Leases Recorded on the Balance Sheet Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Pre-Acquisition ZI brand portfolio Pre-Acquisition Brand Portfolio [Member] Pre-Acquisition Brand Portfolio Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) Security Title of 12(b) Security Net Finite-Lived Intangible Assets, Net Income taxes payable Accrued Income Taxes, Current Shares issued in conversion (in shares) Conversion of Stock, Shares Issued Antidilutive Securities [Axis] Antidilutive Securities [Axis] Tax Receivable Agreements Tax Receivable Agreements Disclosure [Text Block] Tax Receivable Agreements Disclosure Cost of service Cost of Sales [Member] Concentrations of Credit Risk and Significant Customers Concentration Risk, Credit Risk, Policy [Policy Text Block] Vesting [Domain] Vesting [Domain] Interest expense, net Interest Expense Allocation of undistributed earnings Undistributed Earnings (Loss) Available to Common Shareholders, Diluted Net proceeds Sale of Stock, Consideration Received on Transaction Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Product and Service [Axis] Product and Service [Axis] Total liabilities Liabilities Prepaid expenses and other current assets Increase (Decrease) In Prepaid Expense And Other Assets, Current Increase (Decrease) In Prepaid Expense And Other Assets, Current Economic equivalent of Unit (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Economic Equivalent Of Award Granted, Shares Share-Based Compensation Arrangement By Share-Based Payment Award, Economic Equivalent Of Award Granted, Shares Liabilities Liabilities, Lessee [Abstract] Liabilities, Lessee Weighted Average Remaining Service Period (years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Less effects of discounting Lessee, Operating Lease, Liability, Undiscounted Excess Amount Outside the United States Non-US [Member] Database Rights Database Rights [Member] Revenue recognized that was previously included in unearned revenue Contract with Customer, Liability, Revenue Recognized Net income (loss) attributable to ZoomInfo Technologies Inc. Net Income (Loss) Available to Common Stockholders, Basic Commitments and Contingencies Disclosure [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Rent expense Operating Lease, Expense HSKB II Phantom Units Phantom Share Units (PSUs) [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Employment period Capital Allocated For Future Distribution, Distribution Term Capital Allocated For Future Distribution, Distribution Term Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Accounts payable Increase (Decrease) in Accounts Payable Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Amortization of other acquired intangibles Amortization Of Other Intangible Assets Amortization Of Other Intangible Assets Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Debt Instrument [Axis] Debt Instrument [Axis] Additional Paid-in Capital Additional Paid-in Capital [Member] HoldCo ZoomInfo HoldCo HoldCo Units ZoomInfo HoldCo [Member] ZoomInfo HoldCo Acquisition Date Fair Value of Consideration Transferred Schedule of Business Acquisitions, by Acquisition [Table Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities Conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Derivative liability Derivative Liability Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue from Contract with Customer [Abstract] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Beginning balance, Stockholders' Equity (in shares) Ending balance, Stockholders' Equity (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] First Lien Revolver Revolving Credit Facility Revolving Credit Facility [Member] HoldCo Units HoldCo Units [Member] HoldCo Units Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Research and development Research and Development Expense IPO IPO [Member] Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost Reorganization Transactions Reclassification, Comparability Adjustment [Policy Text Block] Cash paid for acquisitions, net of cash acquired Cash paid for acquisitions Payments to Acquire Businesses, Net of Cash Acquired Concentration Risk Type [Axis] Concentration Risk Type [Axis] Units exchangeable for Class A common stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Property and equipment, gross Property, Plant and Equipment, Gross Proceeds from exercise of stock options Proceeds from Stock Options Exercised Restructuring Plan [Domain] Restructuring Plan [Domain] Pre-Acquisition ZI From acquisitions Pre-Acquisition Zoom Information, Inc. [Member] Pre-Acquisition Zoom Information, Inc. Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Sublease, remaining lease term (less than) Lessor, Operating Lease, Remaining Sublease Term Lessor, Operating Lease, Remaining Sublease Term Deferred costs and other assets, net of current portion Deferred costs and other assets, net of current portion [Member] Deferred costs and other assets, net of current portion HSKB Phantom Units Phantom Units [Member] Phantom Units HSKB Incentive Units Incentive Units [Member] Incentive Units Purchase consideration liabilities Business Combination, Consideration Transferred, Liabilities Incurred Increase to authorized plan shares based on stock outstanding, percentage Share-based Compensation Arrangement by Share-based Payment Award, Increase to Authorized Shares Based on Stock Outstanding, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Increase to Authorized Shares Based on Stock Outstanding, Percentage Amortization of deferred commissions costs Amortization of Deferred Sales Commissions Income Statement [Abstract] AOCI AOCI Attributable to Parent [Member] Deferred costs and other assets, net of current portion Increase (Decrease) in Deferred Charges Operating lease liabilities, net of current portion Operating lease liabilities, net of current portion Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Accounting Policies [Table] Accounting Policies [Table] Accounting Policies Draws on revolving credit loan which trigger springing financial covenant (more than) Debt Instrument, Covenant, Threshold Draws On Line Of Credit To Trigger Springing Financial Covenant Debt Instrument, Covenant, Threshold Draws On Line Of Credit To Trigger Springing Financial Covenant OpCo OpCo Units ZoomInfo OpCo [Member] ZoomInfo OpCo Use of Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Internal use developed software Software and Software Development Costs [Member] Comprehensive income (loss) attributable to ZoomInfo Technologies Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Basic net income (loss) per share attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Interest rate cap contract Interest Rate Cap [Member] Current portion of tax receivable agreements liability Tax Receivable Agreements Liability, Current Tax Receivable Agreements Liability, Current Class 1 Unit Class 1 Unit [Member] Class 1 Unit Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Reallocation of earnings as a result of conversion of potentially dilutive instruments Undistributed Earnings, Diluted, Reallocation Of Earnings Upon Conversion Of Potentially Dilutive Instruments Undistributed Earnings, Diluted, Reallocation Of Earnings Upon Conversion Of Potentially Dilutive Instruments Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] OpCo Units OpCo Units [Member] OpCo Units Document Period End Date Document Period End Date Reallocation of undistributed earnings as a result of conversion of Class C to Class A shares Undistributed Earnings, Diluted, Reallocation Of Earnings Upon Conversion Of Common Stock Undistributed Earnings, Diluted, Reallocation Of Earnings Upon Conversion Of Common Stock Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Merger consideration payable Business Combination, Contingent Consideration, Liability Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment [Abstract] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Revenue Disaggregated by Service Offering Disaggregation of Revenue [Table Text Block] Impairment of Long-lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Hedging Designation [Axis] Hedging Designation [Axis] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Beginning balance, Members' Deficit Ending balance, Members' Deficit Members' Equity Equity-Based Compensation Expense Share-based Payment Arrangement, Cost by Plan [Table Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Repurchase of shares, value Stock Repurchased During Period, Value Equity-based compensation expense Share-based Payment Arrangement, Noncash Expense Purchases of property and equipment and other assets Payments to Acquire Productive Assets Entity [Domain] Entity [Domain] Taxes paid related to net share settlement of equity awards Payment, Tax Withholding, Share-based Payment Arrangement Designated as Hedging Instrument Designated as Hedging Instrument [Member] Cover [Abstract] Base Rate Base Rate [Member] Amortization of deferred losses related to the dedesignated Interest Rate Swap Other Comprehensive Income (Loss), Cash Flow Hedge, Effect Of De-Designation Of Hedge, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Effect Of De-Designation Of Hedge, after Tax Komiko Komiko LTD [Member] Komiko LTD Schedule of Short-term Securities Debt Securities, Available-for-sale [Table Text Block] Accounts payable and other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Waltham office relocation Office Relocation [Member] Office Relocation Total intangible assets Finite And Indefinite Lived Intangible Assets Acquired Finite And Indefinite Lived Intangible Assets Acquired Estimated useful life Property, Plant and Equipment, Useful Life Total Carrying Value of Debt Long-term Debt Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Unearned revenue Increase (Decrease) in Contract with Customer, Liability Leases Lessee, Operating Leases [Text Block] Fair Value Disclosures [Abstract] Class C common stock Class C Common Class C [Member] Incentive compensation Business Combination, Consideration Transferred, Incentive Compensation Business Combination, Consideration Transferred, Incentive Compensation Equity award conversion, incremental grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Stock Award Conversion, Incremental Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Stock Award Conversion, Incremental Grant Date Fair Value Customer relationships Customer Relationships [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Estimated Fair Value Debt Securities, Available-for-sale Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Common Units and Class P Units Activity Share-based Payment Arrangement, Activity [Table Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Share-based Payment Arrangement [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Common Units Common Units [Member] Common Units Minimum Minimum [Member] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss Amortized cost, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Tax distributions Cash distributions Payments of Capital Distribution Balance Sheet Location [Domain] Balance Sheet Location [Domain] Post-IPO Awards Post-IPO Awards [Member] Post-IPO Awards Current portion of operating lease liabilities Current portion of operating lease liabilities Current portion of operating lease liabilities Operating Lease, Liability, Current Unamortized equity-based compensation cost, excluding options Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Less: Net income (loss) attributable to noncontrolling interests Add: Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Schedule of Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Tax receivable agreements liability Accrued Income Taxes Entity Interactive Data Current Entity Interactive Data Current Fair Value and Presentation in the Consolidated Balance Sheets for Derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] U.S. UNITED STATES Fair Value Fair Value Disclosures [Text Block] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Unvested Options Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Interest rate swap contracts Interest Rate Swap [Member] Equity-Based Compensation Expense Share-based Payment Arrangement [Policy Text Block] Entity Registrant Name Entity Registrant Name Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Asset impairments Impairment charges Asset Impairment Charges Advertising and Promotional Expenses Advertising Cost [Policy Text Block] Impaired lease-related assets Impaired Lease-Related Assets Impaired Lease-Related Assets Deferred consideration valuation adjustments Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Subscription contract, term Revenue From Contract With Customer, Term Of Contract Revenue From Contract With Customer, Term Of Contract Permanent Equity (Deficit) Members' Equity [Abstract] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Research and development Research and Development Expense [Member] Forward-starting interest rate swap contracts - April 2022 Forward Contracts [Member] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Impairment of goodwill Goodwill, Impairment Loss Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Total future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Ownership of consolidated entity (as a percent) Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest [Abstract] Forward-starting interest rate swap contracts Forward-Starting Interest Rate Swap [Member] Forward-Starting Interest Rate Swap Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Restricted cash, non-current Restricted Cash, Noncurrent Sale of Stock [Axis] Sale of Stock [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Cash Restructuring and Transaction-Related Expenses Costs Associated with Exit or Disposal Activity or Restructuring [Policy Text Block] Goodwill Goodwill Goodwill Forfeitures / cancellations Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Document Transition Report Document Transition Report 2020 Business Acquisitions 2020 Business Acquisitions [Member] 2020 Business Acquisitions HSKB I Class 1 Units HSKB I Class 1 Units [Member] HSKB I Class 1 Units Derivative Assets Derivative Asset, Fair Value, Gross Asset Face amount of debt Debt Instrument, Face Amount Level 2 Fair Value, Inputs, Level 2 [Member] Document Quarterly Report Document Quarterly Report Vesting [Axis] Vesting [Axis] Commissions payable, non-current Accrued Sales Commission, Noncurrent Accrued Sales Commission, Noncurrent Shares converted (in shares) Conversion of Stock, Shares Converted Deferred costs and other assets, net of current portion Assets, Fair Value Disclosure Interest Cap (as a percent) Derivative, Cap Interest Rate General and administrative General and Administrative Expense [Member] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Fair Value Indefinite-lived Intangible Assets Acquired Unearned revenue, current portion Contract with Customer, Liability, Current LTIP Units LTIP Units [Member] LTIP Units Increase in earnings attributable to common shareholders upon conversion of potentially dilutive instruments Undistributed Earnings, Diluted, Increase (Decrease) In Earnings Upon Conversion Of Potentially Dilutive Instruments Undistributed Earnings, Diluted, Increase (Decrease) In Earnings Upon Conversion Of Potentially Dilutive Instruments Credit Facility [Domain] Credit Facility [Domain] Weighted average shares of Class A and Class C common stock outstanding used to calculate diluted net income (loss) per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Derivative Contract [Domain] Derivative Contract [Domain] Assets and (Liabilities) Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Payment provided as percent of net cash savings Payment Provided As Percent Of Net Cash Savings Payment Provided As Percent Of Net Cash Savings Basic (in dollars per share) Basic net income (loss) per share attributable to common stockholders (in dollars per share) Earnings Per Share, Basic Trigerring Events [Axis] Trigerring Events [Axis] Trigerring Events Amortization of acquired technology Cost, Amortization Entity File Number Entity File Number Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Disclosure [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Sales and marketing Selling and Marketing Expense Fair Value Finite-lived Intangible Assets Acquired Brand portfolio Brand Portfolio [Member] Brand Portfolio Restructuring Plan [Axis] Restructuring Plan [Axis] Amortization of debt discounts and issuance costs Amortization of Debt Issuance Costs and Discounts Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Repayment of debt Repayments of Long-term Debt Principal amount redeemed on February 1, 2025 Principal amount redeemed on February 1, 2025 [Member] Principal amount redeemed on February 1, 2025 Remaining performance obligations, amount Revenue, Remaining Performance Obligation, Amount Total equity-based compensation expense Additional expense recognized attributable to service period already elapsed Share-based Payment Arrangement, Expense Depreciation and amortization Other Depreciation and Amortization Balance Sheet Location [Axis] Balance Sheet Location [Axis] Common stock Common Stock, Value, Issued Goodwill and Intangible Assets Disclosure [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Restricted cash, current Restricted Cash, Current Unit options exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Less current portion Long-term Debt, Current Maturities Entity Current Reporting Status Entity Current Reporting Status Public offering price (in dollars per share) Sale of Stock, Price Per Share Conversion of Class C to Class A common shares outstanding (in shares) Incremental Common Shares Attributable To Dilutive Effect Of Conversion Of Common Stock Incremental Common Shares Attributable To Dilutive Effect Of Conversion Of Common Stock Net leverage ratio (not to exceed) Debt Instrument, Covenant, Leverage Ratio, Maximum Debt Instrument, Covenant, Leverage Ratio, Maximum Issuance of Class A common stock upon vesting of RSUs (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Total identifiable net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Number of tax receivable agreements Number Of Tax Receivable Agreements Number Of Tax Receivable Agreements Award vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Debt Issuance Costs Debt, Policy [Policy Text Block] Number of shares held Investment Owned, Balance, Shares Percent attributable to purchase consideration Business Combination, Contingent Consideration Arrangements, Percent Attributable to Purchase Consideration Business Combination, Contingent Consideration Arrangements, Percent Attributable to Purchase Consideration Effect of LLC Unit Exchanges (in shares) Stockholders' Equity, Increase (Decrease) in Shares due to Exchange, Shares Stockholders' Equity, Increase (Decrease) in Shares due to Exchange, Shares Total lease liabilities Operating Lease, Liability Cost of service Cost Of Goods And Service, Including Depreciation And Excluding Amortization Cost Of Goods And Service, Including Depreciation And Excluding Amortization Extinguishment of debt Extinguishment of Debt, Amount Long-term debt, net of current portion Total Long Term Debt Long-term Debt, Excluding Current Maturities Decrease to interest rate Debt Instrument, Interest Rate, Increase (Decrease) Accounts receivable Increase (Decrease) in Accounts Receivable Debt Instrument [Line Items] Debt Instrument [Line Items] Statement of Comprehensive Income [Abstract] Value of consideration transferred Total Purchase Consideration Business Combination, Consideration Transferred Concentration Risk Type [Domain] Concentration Risk Type [Domain] Total liabilities, temporary, and permanent equity (deficit) Liabilities and Equity Number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Entity Address, City or Town Entity Address, City or Town Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk Schedule of Interest Rate Derivatives [Table Text Block] Total consideration Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Hedging Relationship [Axis] Hedging Relationship [Axis] General and administrative General and Administrative Expense Financial Instrument [Axis] Financial Instrument [Axis] Anti-dilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Ex Transition Period Entity Ex Transition Period Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Less: Net income (loss) attributable to ZoomInfo OpCo prior to the Reorganization Transactions Net Income (Loss) Attributable to Parent, Prior to Reorganization Net Income (Loss) Attributable to Parent, Prior to Reorganization Weighted Average Amortization Period Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Total cash, cash equivalents, and short-term investments Cash, Cash Equivalents, and Short-term Investments Gross profit Gross Profit Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Construction in progress Construction in Progress [Member] Entity Tax Identification Number Entity Tax Identification Number Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Number of offices Number Of Offices Number Of Offices Equity-based Compensation Share-based Payment Arrangement [Text Block] Net income (loss) attributable to ZoomInfo Technologies Inc. Net Income (Loss) Attributable to Parent Changes in operating assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] 2021 (excluding three months ended March 31, 2021) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year LIBOR London Interbank Offered Rate (LIBOR) [Member] Investment, Name [Domain] Investment, Name [Domain] Other comprehensive income (loss), net of tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax 3.875% Senior Notes due 2029 Three Point Eight Seven Five Percent Senior Notes Due 2029 [Member] Three Point Eight Seven Five Percent Senior Notes Due 2029 Leases [Abstract] Swap Rate (as a percent) Derivative, Average Fixed Interest Rate Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Assets, Current Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating Expenses [Abstract] Less: Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Earnings Per Share [Abstract] Earnings Per Share [Abstract] Restructuring and transaction related expenses Restructuring Charges Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Cash and Cash Equivalents [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Unearned revenue, net of current portion Contract with Customer, Liability, Noncurrent Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Senior Notes 3.875% Senior Notes [Member] 3.875% Senior Notes Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Redemption price, percentage Debt Instrument, Redemption Price, Percentage Entity Filer Category Entity Filer Category Summary of Unamortized Equity-Based Compensation Costs Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Common Stock Common Stock [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Product and Service [Domain] Product and Service [Domain] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Deferred costs and other assets, net of current portion Deferred Costs, Noncurrent Acquired technology Technology-Based Intangible Assets [Member] Geographic Concentration Risk Geographic Concentration Risk [Member] Property and Equipment Property, Plant and Equipment [Table Text Block] Term Loan Secured Debt [Member] Amount allocated to be paid if holder of grant remains employed Capital Allocated For Future Distribution Capital Allocated For Future Distribution Beginning on February 1, 2024 Beginning on February 1, 2024 [Member] Beginning on February 1, 2024 Tax effect Other Comprehensive Income (Loss), Tax Leasehold improvements Leasehold Improvements [Member] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Adjustment to unearned revenue Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contract With Customer, Liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contract With Customer, Liability Interest rate Debt Instrument, Interest Rate, Stated Percentage Money market mutual funds Money Market Funds [Member] Remaining performance obligations, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Provision for bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Acquired Indefinite-lived Intangible Assets [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Class A common stock Class A Common Class A [Member] Contract assets recorded within Prepaid expenses and other current assets Contract with Customer, Asset, after Allowance for Credit Loss, Current HSKB II Class 1 Units HSKB II Class 1 Units [Member] HSKB II Class 1 Units Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Business Combinations Business Combination Disclosure [Text Block] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Undiscounted Future Minimum Lease Payments Under Non-Cancelable Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Exercise of Class A Common Stock Options Class A Common Stock Options Share-based Payment Arrangement, Option [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] ZoomInfo OpCo and HSKB 2019 Phantom Unit Plans 2019 Phantom Unit Plan [Member] 2019 Phantom Unit Plan Weighted average number of shares of Class A and Class C common stock outstanding (in shares) Number of shares used in basic computation Weighted Average Number of Shares Outstanding, Basic Elected Interest Rate Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Ownership [Axis] Ownership [Axis] Increase in unrecognized equity-based compensation cost Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not Yet Recognized, Amount, Increase (Decrease) Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not Yet Recognized, Amount, Increase (Decrease) Cash Flow Hedging Cash Flow Hedging [Member] Sale of Stock [Domain] Sale of Stock [Domain] Ownership [Domain] Ownership [Domain] Plan Name [Domain] Plan Name [Domain] Ownership interest (as a percent) Equity Method Investment, Ownership Percentage Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Interest paid in cash Interest Paid, Excluding Capitalized Interest, Operating Activities Total equity (deficit) Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Organization and Background Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Additional paid-in capital Additional Paid in Capital Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Cash equivalents Cash Equivalents, at Carrying Value [Abstract] Schedule of Restricted Stock Unit Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Liability for taxes owed and related penalties and interest Income Tax Examination, Penalties Accrued Number of grantees affected Modification To Share-Based Compensation Arrangement, Number Of Grantees Affected Modification To Share-Based Compensation Arrangement, Number Of Grantees Affected Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Accrued expenses and other current liabilities Accrued Liabilities, Current Diluted (in dollars per share) Diluted net income (loss) per share attributable to common stockholders (in dollars per share) Earnings Per Share, Diluted Local Phone Number Local Phone Number HSKB Incentive Units HSKB Units [Member] HSKB Units Cash Payments to Acquire Businesses, Gross Derivative Instruments and Hedging Activities Disclosure [Abstract] Tranche one Share-based Payment Arrangement, Tranche One [Member] Equity interests issued and issuable Issuance of 67,075 Class A shares Issuance of 67,075 Class A shares Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Amortization period Deferred Sales Commissions, Amortization Period Deferred Sales Commissions, Amortization Period Cash, Cash Equivalents, and Short-term Investments Cash and Cash Equivalents Disclosure [Text Block] Diluted net income (loss) per share attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Aggregate principal amount outstanding Long-term Debt, Gross Carrying Values of Borrowings Schedule of Long-term Debt Instruments [Table Text Block] Depreciation expense Depreciation Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Unearned revenue Contract with Customer, Liability Entity Emerging Growth Company Entity Emerging Growth Company Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Intangible assets not subject to amortization Indefinite-lived Intangible Assets (Excluding Goodwill) Potential contingent payments Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Deferred income taxes Deferred Income Tax Expense (Benefit) Derivative Liabilities Derivative Liability, Fair Value, Gross Liability Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Weighted Average Grant Date Fair Value Weighted Average Participation Threshold Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Accrued expenses and other current liabilities Accrued Liabilities, Current [Member] Accrued Liabilities, Current Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] Noncontrolling Interests Noncontrolling Interest [Member] Purchases of short-term investments Payments to Acquire Short-term Investments Retained Earnings Retained Earnings [Member] Payments of deferred consideration Merger consideration payable Payment for Contingent Consideration Liability, Financing Activities Effective tax rate Effective Income Tax Rate Reconciliation, Percent 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] Basis of Presentation and Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Unit options outstanding, weighted average remaining term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Income tax receivable Increase (Decrease) in Income Taxes Receivable Award Type [Domain] Award Type [Domain] Effect of LLC Unit Exchanges Stockholders' Equity, Increase (Decrease) in Shares due to Exchange, Value Stockholders' Equity, Increase (Decrease) in Shares due to Exchange, Value Usage-based Email Verification Service [Member] Email Verification Service Corporate debt securities Corporate Debt Securities [Member] Trading Symbol Trading Symbol Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset [Member] Operating Lease, Right-of-Use Asset Subscription Subscription and Circulation [Member] Remaining Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities: Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Measured on a recurring basis Fair Value, Recurring [Member] Shares withheld related to net share settlement and other (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Other governmental securities Other Governmental Securities [Member] Other Governmental Securities Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Short-term investments Short-term Investments