Company restaurants Company Restaurants [Member] Company Restaurants [Member] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Long-term receivables, net of allowance of $7,344 (2021) and $7,999 (2020) Financing Receivable, after Allowance for Credit Loss, Noncurrent Letter of Credit Letter of Credit [Member] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Risks and Uncertainties Unusual Risks and Uncertainties [Policy Text Block] Unusual Risks and Uncertainties [Policy Text Block] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Emerging Growth Company Entity Emerging Growth Company Operating lease right-of-use assets Operating Lease, Right-of-Use Asset 2019 Class A-2 Notes 2019 Class A-2-I And 2019 Class A-2-II Notes [Member] 2019 Class A-2-I And 2019 Class A-2-II Notes Thereafter Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, After Year Four Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, After Year Four Number of restaurants (restaurant) Number of Restaurants Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Accrued employee compensation and benefits Employee-related Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Receivable Type [Axis] Receivable Type [Axis] Entity Address, Address Line One Entity Address, Address Line One Forfeited (USD 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 Future 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and Cash Equivalents [Table] Closure and Impairment Charges Goodwill and Intangible Assets Disclosure [Text Block] Preferred stock, $1 par value, 10,000,000 shares authorized; no shares issued or outstanding Preferred Stock, Value, Issued Outstanding, beginning of period (in shares) Outstanding, end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Entity Address, City or Town Entity Address, City or Town Tradename Trade Names [Member] (Accumulated Deficit) Retained Earnings Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Number of properties leased Lessor, Number of Properties Leased Lessor, Number of Properties Leased Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Financing obligations, less current maturities Sale Leaseback Financing Obligations The sale leaseback financing obligations due after one year from the balance sheet date or beyond the operating cycle, if longer, 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Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I [Member] 90-119 days Financial Asset, 90 to 119 Days Past Due [Member] Financial Asset, 90 to 119 Days Past Due [Member] Interest expense, net Interest Expense, Debt Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Restricted Stock Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Entity Current Reporting Status Entity Current Reporting Status Cumulative Effect, Period Of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Tax payments for share settlement of restricted stock units Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Payments on operating leases Operating Lease, Payments Closure and impairment charges Total impairment and closure charges Restructuring Costs and 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closure charge revisions Number Of Restaurants Related To Prior Period Closure Charge Revisions Number Of Restaurants Related To Prior Period Closure Charge Revisions Trading Symbol Trading Symbol Additional interest on fixed rate Debt Instrument, Additional Interest On Fixed Rate Debt Instrument, Additional Interest On Fixed Rate 2022 Lessor, Operating Lease, Payment to be Received, Year One Notes receivable Notes Receivable Notes Receivable Current liabilities: Liabilities, Current [Abstract] Receivable [Domain] Receivable [Domain] Non-current restricted cash Non-current restricted cash Restricted Cash and Cash Equivalents, Noncurrent General and administrative expenses General and Administrative Expense Revision of Prior Period [Axis] Revision of Prior Period [Axis] Franchisor Disclosure [Domain] Franchisor Disclosure [Domain] Long-Term Debt Debt Disclosure [Text Block] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Dividends paid on common stock Payments of 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operating leases and interest income from direct financing leases. Common stock, $0.01 par value; shares: 40,000,000 authorized; September 30, 2021 - 25,003,116 issued, 17,219,847 outstanding; December 31, 2020 - 24,882,122 issued, 16,452,174 outstanding Common Stock, Value, Issued Finance lease, weighted average discount rate, percent Finance Lease, Weighted Average Discount Rate, Percent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revision of Prior Period, Accounting Standards Update, Adjustment Revision of Prior Period, Accounting Standards Update, Adjustment [Member] Total compensation cost not yet recognized, period for recognition (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Beginning balance (USD per share) Ending balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Current Financial Asset, Not Past Due [Member] Commitments 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[Member] Schedule of Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Percentage of restaurants operating at full capacity Percentage Of Restaurants Operating At Full Capacity Percentage Of Restaurants Operating At Full Capacity Document Period End Date Document Period End Date Dilutive effect of stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Quarterly principal payment Debt Instrument, Periodic Payment, Principal Goodwill [Line Items] Goodwill [Line Items] Federal Funds Rate Federal Funds Rate [Member] Federal Funds Rate [Member] Entity Registrant Name Entity Registrant Name IHOP advertising funds and gift card programs Advertising Funds and Gift Card Program [Member] Advertising Funds and Gift Card Program Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Numerator for 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