Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted-average shares of Class A common stock outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] 2027 Lessee, Operating And Finance Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating And Finance Lease, Liability, Payments, Due Next Twelve Months Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Pla-Fit Holdings, LLC Pla Fit Holdings LLC [Member] Pla-Fit Holdings, LLC. Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Carrying value Reported Value Measurement [Member] Document Fiscal Year Focus Document Fiscal Year Focus Remaining performance obligation, expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Schedule of Amortization Expense Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Franchise Franchise Segment [Member] Franchise segment. Payment of deferred consideration for acquired clubs Payment for Contingent Consideration Liability, Investing Activities Common stock, value Common Stock, Value, Issued Schedule of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Leases Lessee, Finance Leases [Text Block] Total lease payments Lessee, Operating And Finance Lease, Liability, Payments, Due Lessee, Operating And Finance Lease, Liability, Payments, Due Goodwill And Intangible Assets [Table] Goodwill And Intangible Assets [Table] Goodwill and intangible assets. Restatement Determination Date Restatement Determination Date Schedule of Changes in Corporate-Owned and Franchisee-Owned Stores Schedule of Franchisor Disclosure [Table Text Block] Thereafter Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four Reacquired franchise rights Franchise Rights [Member] Promissory note (up to) Financing Receivable, Available, Gross Financing Receivable, Available, Gross Corporate-owned and franchisee-owned clubs Franchisors [Text Block] Percent of total ASR agreement value Accelerated Share Repurchases, Percentage Of Total Authorized Accelerated Share Repurchases, Percentage Of Total Authorized Sale of corporate-owned clubs Goodwill, Divestiture Amendment Flag Amendment Flag Proceeds from sale of equity-method investment Proceeds from Sale of Equity Method Investments Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Principal payments on capital lease obligations Finance Lease, Principal Payments Franchisor Disclosure Franchisor Disclosure [Domain] January 2026 Promissory Note January 2026 Promissory Note [Member] January 2026 Promissory Note Equipment deposits Increase (Decrease) In Contract With Customer, Customer Deposits, Liability Increase (Decrease) In Contract With Customer, Customer Deposits, Liability Planet Fitmex, LLC Planet Fitmex, LLC [Member] Planet Fitmex, LLC 2024 Share Repurchase Program 2024 Share Repurchase Program [Member] 2024 Share Repurchase Program Bravo Fit Holdings Pty Ltd Planet Fitness Australia Holdings. (Formerly Bravo Fit Holdings Pty Ltd) [Member] Planet Fitness Australia Holdings. (Formerly Bravo Fit Holdings Pty Ltd) 2028 Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability Year Two Income taxes projected future payments under tax benefit arrangements liability year two. Leases [Abstract] Leases [Abstract] Other comprehensive (loss) income, net Other Comprehensive Income (Loss), Net of Tax [Abstract] Total noncurrent liabilities Liabilities, Noncurrent Related party transactions Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Capital expenditures Total Segment Reporting, Long-Lived Asset, Expenditure for Addition Intangible assets, net Net carrying Amount Intangible Asset, Excluding Goodwill, after Accumulated Amortization Share Repurchase Program [Domain] Share Repurchase Program [Domain] Basic (in shares) Weighted-average shares of Class A common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Purchases from related party Related Party Transaction, Purchases from Related Party Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Accretion of marketable securities discount Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Investments, net of allowance for expected credit losses of $25,447 and $24,424 as of June 30, 2026 and December 31, 2025, respectively Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 2027 Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability Year One Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability Year One Customer relationships Customer Relationships [Member] Net deferred tax assets Increase (Decrease) In Deferred Tax Assets, Net Increase (Decrease) In Deferred Tax Assets, Net Remainder of 2026 Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability Remainder Of Fiscal Year Income taxes projected future payments under tax benefit arrangements liability remainder of fiscal year. 2025 Accelerated Share Repurchase Agreement 2025 Accelerated Share Repurchase Agreement [Member] 2025 Accelerated Share Repurchase Agreement Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Relationship to Entity Title and Position [Domain] Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of presentation and consolidation Basis of Accounting, Policy [Policy Text Block] Class of Stock Class of Stock [Axis] Payable pursuant to tax benefit arrangements, net of current portion Tax Benefit Arrangement Payable, Noncurrent Tax Benefit Arrangement Payable, Noncurrent Total Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Number of tax receivable agreements Number Of Tax Receivable Agreements Number of tax receivable agreements. Variable rate Line of Credit Facility, Interest Rate at Period End TRA Holders TRA Holders [Member] TRA Holders Accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Distributions paid to members of Pla-Fit Holdings Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Total other comprehensive (loss) income, net Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Insurance proceeds for property and equipment Proceeds from Insurance Settlement, Investing Activities Current maturities of long-term debt Current portion of long-term debt Long-Term Debt, Current Maturities United States UNITED STATES Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Non-cash additions to property and equipment included in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Deferred revenue Increase (Decrease) in Contract with Customer, Liability Schedule of Financial Information for the Company's Reportable Segments Segment Reporting [Table Text Block] Non-controlling interests Noncontrolling Interest [Member] Use of estimates Use of Estimates, Policy [Policy Text Block] Amortization of deferred financing costs Amortization of Debt Issuance Costs Planet Fitness, Inc. Planet Fitness, Inc. [Member] Planet Fitness, Inc. Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Corporate-owned clubs Corporate-Owned Clubs [Member] Corporate-Owned Clubs Total long-term debt, net Long-Term Debt Payable pursuant to tax benefit arrangements, current Tax Benefit Arrangement Payable, Current Tax Benefit Arrangement Payable, Current Interest receivable accrued Financing Receivable, Change in Present Value, Interest Income Schedule of Maturities of Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Income taxes Increase (Decrease) in Income Taxes Payable Document Period End Date Document Period End Date Changes in operating assets and liabilities, net of acquisitions: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Stockholders' equity Equity [Text Block] Operating costs and expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Schedule of Significant Expense Categories Segment Reporting, Reconciliation of Other Item by Segment to Consolidated [Table Text Block] New clubs opened or acquired Number Of New Stores Opened Number of new stores opened . 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Transactions [Abstract] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other receivables Other Receivables, Net, Current Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted (in shares) Weighted-average shares of Class A common stock outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Franchise Franchise [Member] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Property and equipment, net of accumulated depreciation of $509,156 and $453,852, as of June 30, 2026 and December 31, 2025, respectively Property, Plant, and Equipment and Finance 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Contract With Customer, Liability, Increase (Decrease) Excluding Revenue Recognized Contract With Customer, Liability, Increase (Decrease) Excluding Revenue Recognized Restricted cash Restricted Cash, Current Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Equity-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Holding units exchanged (in shares) Stock Redeemed or Called During Period, Shares Effective income tax rate(in percentage) Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Indefinite-lived Intangible Assets, Major Class Name Intangible Asset, Indefinite-Lived, Class [Domain] Fair value 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Estimated Fair Value of Long-Term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction Related Party Transaction [Axis] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Authorized stock repurchase program amount Share Repurchase Program, Authorized, Amount Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments Segments [Domain] Weighted average cost per share (in usd per share) Accelerated Share Repurchases, 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and Expenses Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders’ deficit attributable to Planet Fitness, Inc. 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During Period, Shares Short-term marketable securities Marketable Securities, Current Other liabilities Other Liabilities, Noncurrent Goodwill Goodwill at December 31, 2025 Goodwill at June 30, 2026 Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Acquisitions Goodwill, Acquired During Period Revenue recognized that was included in the contract liability at the beginning of the year Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Four Finite-Lived Intangible Asset, Expected Amortization, after Year Four Corporate-owned Clubs Corporate-owned clubs Corporate Owned Club Segment [Member] Corporate owned club segment. Accumulated deficit Retained Earnings [Member] Lease liabilities, net of current portion Noncurrent operating lease liabilities Operating Lease, Liability, Noncurrent Money market funds Money Market Funds [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Corporate debt securities Corporate Debt Securities [Member] Diluted (in usd per share) Earnings per share of Class A common stock - diluted (in usd per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense 2028 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Two Lessee, Operating And Finance Lease, Liability, Payments, Due Year Two Ownership [Domain] Ownership [Domain] Payments pursuant to tax benefit arrangements Increase (Decrease) in Accounts Payable, Related Parties Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenue Total revenue from related parties Revenue from Contract with Customer, Excluding Assessed Tax Borrowing capacity available Line of Credit Facility, Remaining Borrowing Capacity Schedule of Deferred Tax Assets and Tax Benefit Arrangement Liabilities Schedule of Stockholders Equity [Table Text Block] Income Tax Disclosure [Table] Income Tax Disclosure [Table] Income Tax Disclosure Maturity dates Debt Securities, Available-for-Sale, Term Financial Instruments [Domain] Financial Instruments [Domain] Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and intangible assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Less: total comprehensive income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Estimated fair value Estimate of Fair Value Measurement [Member] Total intangible assets Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue from contract with customers Revenue from Contract with Customer [Text Block] Prepaid expenses Prepaid Expense, Current Accelerated cash paid Accelerated Share Repurchases, Settlement (Payment) or Receipt Other liabilities and other current liabilities Increase (Decrease) in Other Current Liabilities Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Other investing activity Payment for (Proceeds from) Other Investing Activity Inventory Increase (Decrease) in Inventories Administrative Service Administrative Service [Member] Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Share repurchase excise tax Share Repurchase Program, Excise Tax Segment Reporting [Table] Segment Reporting [Table] Schedule of Future Principal Payments of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Secondary Offering and Exchange Secondary Offering And Exchange [Member] Secondary offering and exchange. Related Party Transaction [Table] Related Party Transaction [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Sale of Stock Sale of Stock [Axis] Title and Position Title and Position [Axis] 2029 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Three Lessee, Operating And Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Schedule of Components of Lease Cost Schedule of Supplemental Disclosures of Cash Flow Information Related to Leases Lease, Cost [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Other income (expense), net: Other Nonoperating Income (Expense) [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Income from operations Operating Income (Loss) Remaining performance obligation Revenue, Remaining Performance Obligation, Amount 2022 Variable Funding Notes 2022 Variable Funding Notes [Member] 2022 Variable Funding Notes Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Maturities of Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Number of units held by owners (in shares) Investment Owned, Balance, Shares Proceeds from issuance of Variable Funding Notes Proceeds from issuance of secured debt Proceeds from Issuance of Debt Franchise revenue Franchise Revenue [Member] Franchise Revenue Dividends accrued on held-to-maturity investment Investment Income, Dividend Amortized cost of held-to-maturity debt security investments Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount 2025 Variable Funding Notes Series 2025-1 Class A-1 Notes [Member] Series 2025-1 Class A-1 Notes 2024-1 Class A-2-I notes Fixed Rate Senior Secured Notes, Class A-2-I, 2024 [Member] Fixed Rate Senior Secured Notes, Class A-2-I, 2024 Related Party Transaction Related Party Transaction [Domain] Total long-lived assets, net Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Lease payments for leases signed but not yet commenced Unrecorded Unconditional Purchase Obligation Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Schedule of Future Payments Under Tax Benefit Arrangements Summary of Income Tax Contingencies [Table Text Block] Entity File Number Entity File Number Segment Adjusted EBITDA Segment Adjusted EBITDA Earnings (Loss) Before Interest Tax Depreciation And Amortization Earnings (loss) before interest tax depreciation and amortization. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Issuance of shares under equity-based compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Number Of Stores [Roll Forward] Number Of Clubs [Roll Forward] Number Of Clubs [Roll Forward] Less: imputed interest Lessee, Operating And Finance Lease, Liability, Undiscounted Excess Amount Lessee, Operating And Finance Lease, Liability, Undiscounted Excess Amount Issuance of note receivable, related party Origination of Notes Receivable from Related Parties Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] 2030 Lessee, Operating And Finance Lease, Liability, Payments, Due Year Four Lessee, Operating And Finance Lease, Liability, Payments, Due Year Four Total lease liabilities Present value of lease liabilities Lease, Liability Lease, Liability Allowance for credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Amount Change In Contract With Customer Liability [Roll Forward] Change In Contract With Customer Liability [Roll Forward] Operational and other Other Cost and Expense, Operating Equity Components Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Related party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Net cash paid for income taxes Income Tax Paid, after Refund Received Franchisor Disclosure Franchisor Disclosure [Axis] Class A common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Current finance lease liabilities Finance Lease, Liability, Current Clubs operated at beginning of period Clubs operated at beginning of period Clubs operated at end of period Number of Stores Less: net income attributable to non-controlling interests Less: net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Deferred revenue expected recognition period (in months) Contract With Customer, Liability, Customer Deposit Expected To Recognized Period Contract With Customer, Liability, Customer Deposit Expected To Recognized Period Exchanges of Class B common stock and other adjustments (in shares) Stock Issued During Period, Shares, Conversion of Units Entity Small Business Entity Small Business Total comprehensive income attributable to Planet Fitness, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Weighted average useful life Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Underlying equity in net assets Equity Method Investment, Underlying Equity in Net Assets Other current liabilities Other Liabilities, Current Total liability related to uncertain tax positions Liability for Uncertainty in Income Taxes, Noncurrent Other assets, net Other Assets, Noncurrent Document Type Document Type 2030 Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability Year Four Income taxes projected future payments under tax benefit arrangements liability year four. Accrued expenses Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Intangible Assets Intangible Asset, Indefinite-Lived [Table Text Block] Summary of significant accounting policies Significant Accounting Policies [Text Block] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount Variable Funding Notes Variable Funding Notes [Member] Variable Funding Notes Club operations Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenue, net of current portion Contract with Customer, Liability, Noncurrent Schedule of Franchisor Disclosure [Table] Franchisor, Ownership [Table] Consolidation Items Consolidation Items [Axis] Holdings units Holdings Units [Member] Holdings Units. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 12) Commitments and Contingencies Gross carrying amount Intangible Asset, Finite-Lived, before Accumulated Amortization Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Gain on sale of equity-method investment Gain on sale of equity-method investment Equity Method Investment, Realized Gain (Loss) on Disposal Loss from equity-method investments, net of tax Losses from equity-method investments, net of tax Income (Loss) from Equity Method Investments Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Percentage of economic interest(in percentage) Percentage Of Economic Interest Percentage of economic interest. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Other segment expenses, net Other Segment Expenses (Income), Net Other Segment Expenses (Income), Net Executive Category: Executive Category [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Liabilities and stockholders’ deficit Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Domain] Inventory Inventory, Net Equity Award Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount U.S. government agency securities US Government Agencies Debt Securities [Member] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Long-term debt, net of current maturities Notes and Loans, Noncurrent 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Economic interest(in percentage) Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Geographical Geographical [Axis] Beginning Balance Ending Balance Deferred revenue Contract with Customer, Liability Other segment (income) expenses, net Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Payment of share repurchase excise tax Payment Of Share Repurchase Program, Excise Tax Payment Of Share Repurchase Program, Excise Tax Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Gain on insurance proceeds Insured Event, Gain (Loss) Business organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total comprehensive income including non-controlling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Ownership (in percentage) Equity Method Investment, Ownership Percentage Equity-based compensation expense Share-Based Payment Arrangement, Noncash Expense 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Total lease cost Lease, Cost Deferred ADA and franchise agreement revenue Area Development Agreements [Member] Area development agreements. Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in usd per share) Earnings per share of Class A common stock - basic (in usd per share) Earnings Per Share, Basic Repurchase and retirement of Class A common stock Payments for Repurchase of Common Stock Deferred revenue, current Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt, net of current maturities Long-Term Debt, Excluding Current Maturities Cost of revenue Cost of Revenue Award Type Award Type [Axis] Payment of deferred financing and other debt-related costs Payments of Financing Costs Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowances for uncollectible amounts of $35 and $428 as of June 30, 2026 and December 31, 2025, respectively Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Total Long-Term Debt Excluding Short Term, Gross Long-Term Debt Excluding Short Term, Gross Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Fair Value Debt Securities, Available-for-Sale Fair Value Measurement [Domain] Fair Value Measurement [Domain] Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Rest of world Non-US [Member] Goodwill And Intangible Assets [Line Items] Goodwill And Intangible Assets [Line Items] Goodwill and intangible assets. Increase to accumulated deficit APIC, Share-Based Payment Arrangement, Recognition and Exercise Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and stockholders’ deficit Liabilities and Equity Variable lease cost Variable Lease, Cost Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net deferred tax assets Deferred Tax Assets, Net Stock options Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Non-controlling interests Equity, Attributable to Noncontrolling Interest Segments Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Equipment Equipment revenue Equipment Revenue [Member] Equipment Revenue [Member] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Income tax receivable and prepayments Income Tax es Receivable And Prepayments Income Tax es Receivable And Prepayments Tabular List, Table Tabular List [Table Text Block] Finite-lived intangible assets: Intangible Asset, Finite-Lived, after Accumulated Amortization [Abstract] Other income, net Other Nonoperating Income (Expense) Long-term debt Long-Term Debt [Text Block] Percentage of remaining tax savings(in percentage) Tax Receivable Agreement Percentage Of Remaining Portion On Applicable Cash Savings Tax receivable agreement percentage of remaining portion on applicable cash savings. 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Restricted assets - national advertising fund Restricted Assets, Advertising Funds, Current Restricted Assets, Advertising Funds, Current Remainder of 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Other (gains) losses, net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Applicable tax savings (in percentage) Tax Receivable Agreement Percentage Tax receivable agreement percentage. Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Equipment deposits Equipment Deposits, Current Equipment Deposits, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Corporate and other unallocated expenses, net Other General Expense 2025 Share Repurchase Program 2025 Share Repurchase Program [Member] 2025 Share Repurchase Program Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Held-to-maturity debt security Investment, Policy [Policy Text Block] Club compensation and payroll Cost, Direct Labor Name Measure Name Schedule of Roll forward of Allowance for Expected Credit Losses on Held-to-maturity Investments Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] 2025-1 Class A-2-I notes Fixed Rate Senior Secured Notes, Class A-2-I, 2025 [Member] Fixed Rate Senior Secured Notes, Class A-2-I, 2025 Income taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Other assets and other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid- in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Dividends accrued on held-to-maturity investment Dividends Accrued On Investment Dividends Accrued On Investment Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Total Segment Adjusted EBITDA to Income Before Taxes Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] National advertising fund expense Advertising Fund Expense Advertising Fund Expense Investments, Debt and Equity Securities [Abstract] Issuance of shares under equity-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net income Net income including non-controlling interests Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Operating lease ROU assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Provision for income taxes Income Tax Expense (Benefit) Equipment deposits Contract With Customer, Liability, Customer Deposit, Current Contract With Customer, Liability, Customer Deposit, Current Tax benefit arrangement liabilities Deferred Tax Liability, Increase (Decrease) Deferred Tax Liability, Increase (Decrease) Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator Net Income (Loss) Attributable to Parent [Abstract] Number of members Number Of Members Number of members. Net income attributable to Planet Fitness, Inc. Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Write-offs, net of recoveries Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Writeoff Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Remaining Performance Obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Interest income Investment Income, Interest Schedule of Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Franchisee-owned clubs: Franchised Units [Member] Revenue: Revenues [Abstract] Thereafter Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability After Year Four Income Taxes Projected Future Payments Under Tax Benefit Arrangements Liability After Year Four Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]