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Investment in equity securities Earn out payments Business Combination Contingent Consideration Earnout Payment Business combination contingent consideration earnout payment. 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Commercial paper Commercial Paper [Member] Commercial Paper [Member] Current Fiscal Year End Date Current Fiscal Year End Date Interest Payable Interest payable Derivative Instruments and Hedging Activities Disclosure [Abstract] Agency Bonds Maturities Less Than 90 Days [Member] Agency bonds maturities less than 90 days. Derivative, Maturity Date Maturity date Financial Instruments Financial Instruments [Domain] Subscription services member. Subscription Services [Member] Subscription Services [Member] Tax receivable agreement benefit percentage. 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Benefit from (provision for) income taxes Benefit from (provision for) income taxes Income Tax Expense (Benefit), Total Income Tax Expense (Benefit) Tax receivable agreement realized tax benefits payable to related parties percent Tax receivable agreement realized tax benefits payable to related parties percent. 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Stock issued during period, shares, new issues Stock Issued During Period, Shares, New Issues Issuance of Class A common stock in IPO net of costs, Share Contingent consideration, current Accrued Expenses Contingent Consideration Current Accrued expenses contingent consideration current. Business Acquisition, Goodwill, Expected Tax Deductible Amount Goodwill Directed Share Program [Member] Directed share program. Directed Share Program [Member] Number of Reporting Units Number of Reporting Units Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Receivable, related parties Accounts Receivable, Related Parties, Current Schedule of Operating Lease Liabilities Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Transaction, integration and restructuring expenses. Transaction, Integration and Restructuring Expenses Transaction, integration and restructuring expenses Schedule Of Entity Wide Revenue By Major Customers By Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Loss from operations Operating Income (Loss) Goldman Sachs Bank USA [Member] Goldman Sachs Bank USA [Member] Lessee, Operating Lease, Option to Extend Option to extend lease term Related Party [Domain] Office Relocation [Member] Office Relocation [Member] Office relocation. Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Scenario [Axis] Cash consideration paid at closing Asset Acquisition, Consideration Transferred, Transaction Cost Definitive Healthcare Corp. [Member] Definitive Healthcare Corp. [Member] Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) [Abstract] Acquisitions: Entity Filer Category Entity Filer Category Long term liabilities: Liabilities, Noncurrent [Abstract] Restructuring Plan [Domain] TRA Remeasurement Gain Loss TRA Remeasurement Gain Loss TRA remeasurement gain loss. 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Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Initial Effect Of The Reorganization Transactions Initial Effect Of The Reorganization Transactions Initial effect of the Reorganization Transactions and IPO on noncontrolling interests Additional Paid in Capital, Total Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Additional Paid in Capital Additional paid-in capital Entity Interactive Data Current Entity Interactive Data Current Related Parties Related Party Transactions Disclosure [Text Block] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Intangible assets Related Party Transactions [Abstract] Limited Liability Company (LLC) Members' Equity, Unit-Based Payment Arrangement Equity-based compensation Lessee, Operating Lease, Liability, to be Paid, Year One 2022, excluding the nine months ended September 30, 2022 Members' Equity [Abstract] Equity: Leasehold Improvements [Member] Leasehold Improvements [Member] Proceeds from Issuance Initial Public Offering Proceeds from issuance of IPO Local Phone Number Local Phone Number Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Purchase price Purchase price Asset Acquisition, Consideration Transferred Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Net pre-tax gains Net income loss attributable to definitive Opco prior to reorganization transactions. 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Lessee, Operating Lease, Liability, to be Paid, Year Two 2023 Net loss per share, basic Basic and diluted Earnings Per Share, Basic Earnings Per Share, Basic, Total Payment For Distributions To Members Payment for distributions to members Member distributions Two Thousand Nineteen Term Loan. Two Thousand Nineteen Term Loan [Member] 2019 Term Loan [Member] Restructuring and related cost, remaining Restructuring and Related Cost, Expected Cost Remaining Tax Credit Carryforward [Table] Certificates of Deposit Maturities Less Than 90 Days [Member] Certificates of deposit maturities less than 90 days. Deferred contract costs, net of current portion Deferred Contract Costs Net Of Current Portion Deferred contract costs, net of current portion. 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Principal Long-Term Debt, Gross Outstanding principal balance 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Common Stock, Shares Authorized Common stock, shares authorized Trading Symbol Trading Symbol Ownership [Axis] Unrealized Gains on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Title of Individual [Domain] Balance Sheet Location [Axis] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to Definitive Healthcare Corp. Amount Expected Paid Over Next Twelve Months Amount Expected Paid Over Next Twelve Months Accounts payable Accounts Payable, Current Accounts Payable, Current, Total Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Gross unrealized losses Gross unrealized losses Schedule of Company’s Unvested Time-Based and Performance-Based Unit Activity Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Line Items] Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) [Line Items] Disclosure Summary Of Significant Accounting Policies Additional Information Details [Line Items] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Title of Individual [Axis] Balloon payment Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Comprehensive income loss attributable to Definitive Opco prior To reorganization transactions. 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