Document And Entity Information
us-gaap_DerivativeGainLossOnDerivativeNet
Derivative, Gain (Loss) on Derivative, Net, Total
Note To Financial Statement Details Textual
Intangible assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Significant Accounting Policies
Note 2 - Summary of Accounting Policies
Note 3 - Acquisitions
Risk free interest rate
Note 4 - Derivative Instruments and Hedging Activities
Note 5 - Accumulated Other Comprehensive Loss
Note 6 - Segment Reporting
Schedule Of Intangible Assets [Table Text Block]
Tabular disclosure of intangible assets, by major asset class.
Not Designated as Hedging Instrument [Member]
Note 7 - Balance Sheet Details
Net periodic Benefit Costs [Member]
The type or description of the periodic benefit costs associated with the defined benefit plan.
Proceeds from beneficial interest in securitization transactions
Note 8 - Goodwill and Intangible Assets
Note 9 - Product Warranty Obligations
Accounts receivable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
Income Tax Disclosure [Text Block]
Note 10 - Credit Agreements
Note 12 - Earnings Per Share
Hedging Designation [Axis]
Note 13 - Income Taxes
gnrc_AdjustedEBITDA
Total adjusted EBITDA
Represents net income before interest expense, taxes, depreciation and amortization, as further adjusted for other non-cash items
Hedging Designation [Domain]
Note 14 - Benefit Plans
Inventories
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
Expected stock price volatility
Note 15 - Share Plans
us-gaap_LiabilitiesCurrent
Total current liabilities
Schedule of Maturities of Long-term Debt [Table Text Block]
Note 16 - Commitments and Contingencies
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Note 17 - Quarterly Financial Information (Unaudited)
gnrc_BusinessOptimizationExpense
Business optimization expenses (6)
Represents charges relating to business optimization and restructuring costs.
Note 18 - Valuation and Qualifying Accounts
Note 2 - Summary of Accounting Policies - Property and Equipment Estimated Useful Lives (Details)
Expected life of options (Year)
gnrc_Other
Other
Represents other non-cash items that are not categorized separately.
Note 2 - Summary of Accounting Policies - Impact of Adopting Accounting Standards (Details)
Note 3 - Acquisitions - Redeemable Noncontrolling Interest (Details)
us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Pension liability adjustment
gnrc_TransactionCostsAndCredityFaciltyFees
Transaction costs and credit facility fees (5)
Represents transaction costs incurred directly in connection with any investment, as defined in our credit agreement; equity issuance, debt issuance or refinancing; together with certain fees relating to our senior secured credit facilities.
Note 3 - Acquisitions - Preliminary Price Allocation (Details)
Note 3 - Acquisitions - Unaudited Pro Forma Information (Details)
Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details)
gnrc_NoncashWritedownAndOtherAdjustments
Non-cash write-down and other adjustments (1)
Represents information about non-cash write-down and other adjustments. Includes gains/losses on disposal of assets, unrealized mark-to-market adjustments on commodity contracts, and certain foreign currency and purchase accounting related adjustments.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Note 5 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details)
Note 6 - Segment Reporting - Net Sales by Products and Services (Details)
Note 6 - Segment Reporting - Segment Information (Details)
us-gaap_DerivativeRemainingMaturity1
Derivative, Remaining Maturity
Note 7 - Balance Sheet Details - Inventories (Details)
Note 7 - Balance Sheet Details - Property and Equipment (Details)
Share-based Compensation, Stock Options, Activity [Table Text Block]
Note 8 - Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details)
Note 8 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details)
Note 9 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details)
Granted (in dollars per share)
us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Business Acquisition, Percentage of Voting Interests Acquired
us-gaap_DerivativeNumberOfInstrumentsHeld
Derivative, Number of Instruments Held, Total
Vested (in dollars per share)
Note 9 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties (Details)
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Note 9 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties 2 (Details)
Forfeited (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Non-vested (in dollars per share)
Non-vested (in dollars per share)
Note 9 - Product Warranty Obligations - Deferred Product Obligations (Details)
Note 10 - Credit Agreements - Short-term Borrowings (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited (in shares)
Note 10 - Credit Agreements - Long-term Borrowings (Details)
Note 10 - Credit Agreements - Maturities of Long-term Borrowings Outstanding (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Non-vested (in shares)
Non-vested (in shares)
Foreign currency translation adjustment
Note 12 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details)
us-gaap_GoodwillAndIntangibleAssetImpairment
Goodwill and Intangible Asset Impairment, Total
Note 13 - Income Taxes - Provision for Income Taxes (Details)
Current portion of long-term borrowings and capital lease obligations
Note 13 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details)
gnrc_PerformanceShareAwardPercentage
Performance Share Award, Percentage
The percentage of the target performance share award.
Note 13 - Income Taxes - Unrecognized Tax Benefits (Details)
Granted (in shares)
Note 13 - Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested (in shares)
Note 14 - Benefit Plans - Accumulated Benefit Obligation (Details)
Note 14 - Benefit Plans - Components of Net Periodic (Benefit) Cost (Details)
Less: current portion of debt
Note 14 - Benefit Plans - Weighted-average Assumptions Used to Determine Net Periodic Pension (Benefit) Cost (Details)
Less: current portion of capital lease obligation
Note 14 - Benefit Plans - Weighted-average Asset Allocation (Details)
Note 14 - Benefit Plans - Fair Value of Pension Plan's Assets (Details)
Note 14 - Benefit Plans - Reconciliation of Level 3 Assets (Details)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]
Note 14 - Benefit Plans - Expected Benefit Payments (Details)
us-gaap_OtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss)
Note 15 - Share Plans - Weighted-average Assumptions used in the Black-Scholes-Merton Option Pricing Model (Details)
Note 15 - Share Plans - Summary of Stock Option Activity (Details)
Exercisable, weighted average exercise price (in dollars per share)
Schedule of Net Benefit Costs [Table Text Block]
Exercisable, weighted average remaining contractual term (Year)
Note 15 - Share Plans - Summary of Restricted Share Awards Activity (Details)
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Other Comprehensive Income (Loss), before Reclassifications, before Tax
Note 16 - Commitments and Contingencies - Minimum Rental Payments (Details)
Exercisable, aggregate intrinsic value
Foreign Exchange Contract [Member]
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Note 17 - Quarterly Financial Information (Unaudited) - Unaudited Quarterly Financial Information (Details)
Commodity Contract [Member]
Note 18 - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details)
Other comprehensive income (loss) before reclassifications
Notes To Financial Statements
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Amounts reclassified from AOCL
Notes To Financial Statements [Abstract]
Schedule of Expected Benefit Payments [Table Text Block]
Balance
Total stockholders’ equity
Beginning Balance
Ending Balance
Exercisable, number of options (in shares)
Outstanding, weighted average remaining contractual term (Year)
Outstanding, aggregate intrinsic value
Weighted average grant date fair value (in dollars per share)
Schedule of Assumptions Used [Table Text Block]
Schedule of Allocation of Plan Assets [Table Text Block]
Goodwill, gross
us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Accumulated impairment
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
Forfeited, weighted average exercise price (in dollars per share)
Goodwill and Intangible Assets Disclosure [Text Block]
Granted, weighted average exercise price (in dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Schedule of Goodwill [Table Text Block]
Exercised, weighted average exercise price (in dollars per share)
Accrued wages and employee benefits
Pension Plan [Member]
Accounts payable
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding, number of options (in shares)
Outstanding, number of options (in shares)
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Credit Facility [Axis]
Other Pension Plan [Member]
Proceeds from sale of property and equipment
Credit Facility [Domain]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Other accrued liabilities
Other accrued liabilities
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Trade Names [Member]
Capital expenditures
Expenditures for property and equipment
us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive effect of stock compensation awards (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Income taxes
Noncompete Agreements [Member]
Current liabilities:
Supplemental Balance Sheet Disclosures [Text Block]
Treasury Stock [Text Block]
Unpatented Technology [Member]
Assets
Total assets
Supplemental disclosure of cash flow information
Patents [Member]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Customer Lists [Member]
Computer Software, Intangible Asset [Member]
us-gaap_CapitalizedContractCostNet
Capitalized Contract Cost, Net, Total
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Business Description and Basis of Presentation [Text Block]
Equity Award [Domain]
After 2022
Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fourth fiscal year following the latest fiscal year.
us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Cash dividends paid to noncontrolling interest of subsidiary
gnrc_TaxCreditCarryForwardStateResearchAndDevelopment
Tax Credit Carry Forward State Research and Development
The amount of the state research and development credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
gnrc_DeferredIncomeTaxExpenseBenefitBeforeAdjustmentOfValuationAllowance
Deferred
The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations before adjustment of change in valuation allowance.
gnrc_TaxCreditCarryforwardStateManufacturing
Tax Credit Carryforward State Manufacturing
The amount of the state manufacturing tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
Award Type [Axis]
Net income attributable to Generac Holdings Inc.
Net income attributable to Generac Holdings Inc.
Net income attributable to Generac Holdings Inc.
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-lived intangible assets, accumulated amortization
Finite-lived intangible assets, net
gnrc_DefinedContributionPlanPercentageOfEligibleCompensation
Defined Contribution Plan Percentage of Eligible Compensation
Percentage of eligible compensation of employees under defined contribution plan.
Total intangible assets, net
gnrc_EmployerContributionUnderMedicalAndDentalPlan
Employer Contribution under Medical and Dental Plan
Contribution made under medical and dental plan made by the employer.
gnrc_NetDebtLeverageRatioNotAchieved
Net Debt Leverage Ratio Not Achieved
Represents net debt leverage ratio that the borrower has not achieved (the borrower's actual net debt leverage ratio is above this target).
Captiva Energy Solutions Private Limited [Member]
Acquired entity specializing in customized industrial generators.
gnrc_NumberOfSalesOffices
Number of Sales Offices
Represents the number of sales offices.
Finite-lived intangible assets, gross
Restricted Stock [Member]
Net income attributable to noncontrolling interests
Equity and Real Estate [Member]
This category includes information about investment in equity ownership interests and real estate.
Performance Shares [Member]
Employee Stock Option [Member]
Foreign currency translation
Antidilutive Securities [Axis]
Domestic Equity [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other domestic legal entities which ownership interest is represented by shares of common or preferred stock.
Antidilutive Securities, Name [Domain]
Schedule of Fair Value of Plan Assets [Table Text Block]
Tabular disclosure of the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.
Acquisitions of businesses, net
International Equity [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other international legal entities which ownership interest is represented by shares of common or preferred stock.
Indefinite-lived tradenames, gross
gnrc_NetIncomeLossAvailableToCommonStockholders
Net income attributable to common shareholders
Net income after adjustments for redeemable noncontrolling interest redemption value.
Other Investment [Member]
Other investments not specified in the taxonomy.
gnrc_EffectiveIncomeTaxRateReconciliationTaxCreditStatePercent
State credits
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state tax credit.
Comprehensive income (loss) attributable to noncontrolling interests
Business Combination Disclosure [Text Block]
Commitments and Contingencies Disclosure [Text Block]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated depreciation
Property and equipment, net
Total
Change in noncontrolling interest share
Goodwill
Goodwill
Goodwill, Ending Balance
Balance
Balance
Acquisition of business
Total [Member]
Refers to information regarding the total equity component, which includes both the noncontrolling interest and controlling interest.
us-gaap_PropertyPlantAndEquipmentGross
Property and equipment, gross
us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Balance at beginning of period
Balance at end of period
gnrc_BusinessAcquisitionPortionOfRemainingInterestCallable
Business Acquisition, Portion of Remaining Interest, Callable
Portion of remaining interest callable as per an acquisition agreement.
Other, Net [Member]
Related to the other, net income statement line item.
Net Debt Leverage Ratio Threshold Not Achieved [Member]
Related to the situation where the net debt leverage ratio threshold was not achieved.
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
gnrc_SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceMeasurementPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Period
Period of performance measurement for share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
Expected annual dividend per share (in dollars per share)
The estimated amount of dividends per share to be paid to holders of the underlying shares (expected dividends) over the option's term.
Pramac [Member]
Pramac is a leading manufacturer of portable, commercial and industrial generators primarily sold under the Pramac brand, including PR Industrial S.r.1 and its subsidiaries.
us-gaap_TemporaryEquityNetIncome
Net income
us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Foreign currency translation
After 2023, capital leases
us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Total minimum lease payments
Net income
Net income
Net income
Net income
2022, capital leases
us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Total comprehensive income
2023, capital leases
2020, capital leases
2021, capital leases
gnrc_SecSchedule1209ValuationAllowancesAndReservesRecoveryFromBusinessAcquired
Reserves Assumed in Acquisition
Amount of decrease in valuation and qualifying accounts and reserves from business combination.
Derivative Instrument [Axis]
Derivative Contract [Domain]
2019, capital leases
Investing activities
Valuation and Qualifying Accounts [Table Text Block]
A tabular disclosure of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements.
Earnings Per Share [Text Block]
us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Interest
Customer lists, net
Carrying amount, net of accumulated amortization, as of the balance sheet date of an asset having a finite beneficial life acquired in a business combination or other transaction representing a favorable existing relationship with customers.
Redeemable Noncontrolling Interest [Member]
Information pertaining to redeemable noncontrolling interest.
us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued wages and employee benefits
us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Other accrued liabilities
us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Present value of minimum lease payments
Provision for income taxes
Provision for income taxes
Patents, net
Carrying amount, net of accumulated amortization, as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights.
Noncontrolling interest of Pramac
Increase in temporary equity from a business acquisition.
Short-term Debt, Type [Axis]
Tradenames, net
The net carrying amount as of the balance sheet date of indefinite-lived and finite-lived tradenames on the statement of financial position representing the rights acquired through registration of a trade name to gain or protect exclusive use thereof.
Short-term Debt, Type [Domain]
SEC Schedule, 12-09, Reserve, Inventory [Member]
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
gnrc_ExcessPurchasePriceOverPredecessorBasis
Excess purchase price over predecessor basis
The element that represents the excess purchase price over predecessor basis.
gnrc_ChangeInNoncontrollingInterestEquityImpact
Change in noncontrolling interest share
Represents equity impact of the change in non-controlling interest.
us-gaap_OperatingExpenses
Total operating expenses
us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Pension liability adjustment, tax
Loss on change in contractual interest rate
Gain Loss on Change in Cash Flows Related to Debt
Loss on change in contractual interest rate
Gain (loss)on change in cash flows related to debt during the period.
us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Cost
General and administrative
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill
The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill.
Fair values of the Pension Plan's assets
Balance at beginning of period
Balance at end of period
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
us-gaap_AllocatedShareBasedCompensationExpense
Allocated Share-based Compensation Expense, Total
us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Funded status: accrued pension liability included in other long-term liabilities
gnrc_NumberOfNewContractsEntered
Number of New Contracts Entered
Number of new contracts entered into during the period mentioned.
us-gaap_DefinedBenefitPlanBenefitObligation
Projected benefit obligation at beginning of period
Projected benefit obligation at end of period
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
2024– 2028
gnrc_DerivativeAssetsLiabilitiesNetFairValueOfDerivativeContractsExcludingImpactOfCreditRisk
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk
Represents the fair value of derivative contracts excluding impact of credit risk.
Company contributions
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2020
Schedule Of Derivative Assets (Liabilities) at Fair Value [Table Text Block]
Tabular disclosure of derivative assets and liabilities at fair value.
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2021
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2022
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
2023
Amendment Flag
Comprehensive income attributable to Generac Holdings Inc.
Comprehensive income attributable to Generac Holdings Inc.
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2019
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_TreasuryStockSharesAcquired
Net share settlement of restricted stock awards (in shares)
Expected long-term rate of return on plan assets
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Rate of compensation increase
gnrc_SharesAcquiredUnderStockRepurchasesProgramValue
Stock repurchases
Equity impact of the value of stock that has been repurchased during the period and are being held in treasury
gnrc_SharesAcquiredUnderStockRepurchasesProgramShares
Shares Acquired Under Stock Repurchases Program, Shares
Stock repurchases (in shares)
Number of shares that have been repurchased during the period and are being held in treasury
us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other assets
Current Fiscal Year End Date
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
Discount rate
us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Debt Instrument, Interest Rate, Increase (Decrease)
us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
us-gaap_DebtInstrumentFairValue
Debt Instrument, Fair Value Disclosure, Total
Accumulated benefit obligation at end of period
Document Fiscal Period Focus
Document Fiscal Year Focus
Consolidation, Policy [Policy Text Block]
us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total
Document Period End Date
us-gaap_DebtInstrumentFeeAmount
Debt Instrument, Fee Amount
Entity Emerging Growth Company
Entity Shell Company
Document Type
Loss on extinguishment of debt
Gain (Loss) on Extinguishment of Debt, Total
Loss on extinguishment of debt
Entity Small Business
Actual return on plan assets
us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid
Benefits paid
Document Information [Line Items]
Document Information [Table]
Entity Public Float
us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid
Benefits paid
Entity Filer Category
Entity Current Reporting Status
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
dei_EntityNumberOfEmployees
Entity Number of Employees
us-gaap_DefinedBenefitPlanActuarialGainLoss
Net actuarial (gain) loss
Variable Rate [Domain]
Excess tax benefits from equity awards
Schedule of Long-term Debt Instruments [Table Text Block]
Variable Rate [Axis]
us-gaap_CapitalizedContractCostAmortization
Capitalized Contract Cost, Amortization
Residential Power Products [Member]
Represents products and services related to residential power.
us-gaap_ConcentrationRiskPercentage1
Concentration Risk, Percentage
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Accounts receivable
Share-based compensation
Quarterly Financial Information [Text Block]
Entity Central Index Key
Commercial and Industrial Power Products [Member]
Represents products and services related to commercial and industrial power.
Entity Registrant Name
Entity [Domain]
Customer Concentration Risk [Member]
Legal Entity [Axis]
Other Products and Services [Member]
Represents information pertaining to products and services not separately disclosed.
Amortization of intangibles
Amortization of Intangible Assets, Total
us-gaap_TreasuryStockValueAcquiredCostMethod
Net share settlement of restricted stock awards
Geographic Concentration Risk [Member]
Dies and Tools [Member]
Tangible personal property used to produce goods and services.
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
us-gaap_TreasuryStockValue
Treasury stock, at cost, 9,047,060 and 8,448,874 shares at December 31, 2018 and 2017, respectively
Entity Common Stock, Shares Outstanding (in shares)
gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts
Amortization of deferred revenue contracts
Represents the aggregate decrease in the liability for accruals related to extended product warranties issued during the reporting period, due to amortization of deferred revenue.
us-gaap_AdvertisingExpense
Advertising Expense
Sales Revenue, Net [Member]
Accounts Receivable [Member]
Net Assets, Geographic Area [Member]
us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Defined Benefit Plan, Amortization of Gain (Loss)
Amortization of net loss
Product Warranty Obligations Included In Consolidated Balance Sheet [Table Text Block]
Product warranty obligations included in consolidated balance sheet.
us-gaap_IncreaseDecreaseInInventories
Inventories
Inventories
Trading Symbol
us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Net periodic pension cost (benefit)
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Interest cost
us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Expected return on plan assets
gnrc_UncommittedIncrementalTermLoanFacility
Uncommitted Incremental Term Loan Facility
Refers to uncommitted incremental term loan facility after amendment.
us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercised, number of options (in shares)
us-gaap_TableTextBlock
Notes Tables
Term Loan [Member]
Credit facility arrangement having an initial term longer than one year or beyond the normal operating cycle, if longer.
LIBOR Floor Rate [Member]
Floor interest rate at which a bank borrows funds from other banks in the London interbank market.
Adjusted LIBOR Rate [Member]
Adjusted interest rate at which a bank borrows funds from other banks in the London interbank market, plus an applicable margin.
Net Debt Leverage Ratio Threshold [Member]
Represents the specific threshold of the company's leverage ratio according to the terms of the loan agreement.
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
gnrc_NetDebtLeverageRatioThreshold
Net Debt Leverage Ratio Threshold
Threshold of the ratio used to calculate the financial leverage and the ability to meet financial obligations. If the borrower's actual net debt leverage ratio falls below this threshold for a certain measurement period, the applicable margin related to LIBOR rate loans can be reduced by a specified percentage.
Asset Category, Target
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
Asset Category, Percentage
Amended ABL Facility [Member]
The description or name of the credit facility.
ABL Revolving Credit Facility [Member]
Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.
Granted, number of options (in shares)
Net actuarial loss, net of tax
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Forfeited, number of options (in shares)
Selling and service
Other Lines of Credit [Member]
Other contractual arrangements with lenders under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars, not separately disclosed.
gnrc_AmountFinancedByDealers
Amount Financed by Dealers
Amount financed by dealers to purchase goods from the entity.
Realized gains
Raw material
Purchases
us-gaap_DefinedBenefitPlanPlanAssetsLevel3ReconciliationDecreaseForSale
Redemptions
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders’ equity
Finished goods
us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
Balance
Work-in-process
UNITED STATES
Research and development
Research and Development Expense, Total
Retained earnings
Retained earnings
Accumulated other comprehensive loss
Schedule of Short-term Debt [Table Text Block]
Mutual Fund [Member]
Fixed Income Funds [Member]
Debt Disclosure [Text Block]
us-gaap_InterestExpense
Interest expense
Net changes in operating assets and liabilities, net of acquisitions:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]
us-gaap_OtherNoncashIncomeExpense
Other
Subsequent Event [Member]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Domain]
Schedule of Inventory, Current [Table Text Block]
Deferred income taxes
us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred Tax Assets, Net, Noncurrent
Subsequent Event Type [Axis]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Subsequent Event Type [Domain]
Other intangible assets, net
Pension and Other Postretirement Benefits Disclosure [Text Block]
Total intangible assets, gross
Subsequent Events [Text Block]
Deferred income taxes
Deferred income taxes
us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Deferred Compensation Arrangement with Individual, Compensation Expense
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Finite-Lived Intangible Assets, Amortization Expense, Year Two
Fair Value of Financial Instruments, Policy [Policy Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Finite-Lived Intangible Assets, Amortization Expense, Year Three
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Assets, Amortization Expense, Year Four
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Finite-Lived Intangible Assets, Amortization Expense, Year Five
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Excess tax benefits from equity awards
gnrc_NumberOfCountriesWhereProductIsSoldBySubsidiary
Number of Countries Where Product is Sold by Subsidiary
Represents the number of countries in where the subsidiary sells its products.
us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
Deferred Compensation Arrangement with Individual, Shares Issued
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Other assets
us-gaap_ShareBasedCompensation
Share-based compensation expense
Non-cash share-based compensation expense (2)
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Title of Individual [Axis]
Relationship to Entity [Domain]
Finite-lived intangible assets, useful life (Year)
Amortization of original issue discount and deferred financing costs
Operating expenses:
Income Tax, Policy [Policy Text Block]
Long-term debt and capital lease obligations (including current portion)
gnrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongtermDebtAndCapitalLeaseObligation
Amount of long-term debt and capital lease obligation, assumed at the acquisition date.
Research and Development Expense, Policy [Policy Text Block]
us-gaap_Depreciation
Depreciation, Total
Depreciation and Amortization
Depreciation and amortization
us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Shares Paid for Tax Withholding for Share Based Compensation
us-gaap_AssetsCurrent
Total current assets
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
gnrc_NoncontrollingInterestTermOfPutOptionInWhichOptionPriceIsFixed
Noncontrolling Interest, Term of Put Option in which Option Price is Fixed
The term in which the price a put option available to the noncontrolling interest of a business acquired by the reporting entity is fixed.
gnrc_NoncontrollingInterestTermOfPutOption
Noncontrolling Interest, Term of Put Option
The term of a put option available to the noncontrolling interest of a business acquired by the reporting entity.
Treasury stock, shares (in shares)
Advertising Costs, Policy [Policy Text Block]
Common stock, par value $0.01, 500,000,000 shares authorized, 71,186,418 and 70,820,173 shares issued at December 31, 2018 and 2017, respectively
Adjustment to reconcile net income to net cash provided by operating activities:
Short-term borrowings
gnrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedShortTermBorrowings
Amount of short term borrowings due within one yea or withing the normal operating cycle, if longer, assumed at the acquisition date.
gnrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
Total assets acquired
Represents the total assets acquired from a business combination which includes identifiable assets acquired and liabilities assumed assets, including goodwill.
Common stock, shares authorized (in shares)
Common stock, shares issued (in shares)
gnrc_ExtendedWarrantyTerm
Extended Warranty Term
Expiration period of the extended warranty.
us-gaap_PensionContributions
Payment for Pension Benefits
Common stock, par value (in dollars per share)
Selmec [Member]
Represents the information pertaining to Selmec.
Restatement [Axis]
Restatement [Domain]
Previously Reported [Member]
Restatement Adjustment [Member]
us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowance
Range [Domain]
Maximum [Member]
Minimum [Member]
Ownership [Domain]
Product and Service [Axis]
Product and Service [Domain]
us-gaap_DeferredTaxAssetsNet
Total deferred tax assets
Range [Axis]
us-gaap_OperatingLeasesRentExpenseNet
Operating Leases, Rent Expense, Net, Total
Debt, Policy [Policy Text Block]
Ownership [Axis]
us-gaap_NumberOfReportingUnits
Number of Reporting Units
Interest
Savings Plan 401(k) [Member]
Represents the companies defined-contribution 401(k) savings plan.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Other
Geographical [Axis]
Geographical [Domain]
Property, Plant and Equipment [Table Text Block]
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
Inventories
Inventories
Total
Fair Value, Inputs, Level 3 [Member]
us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total
Deferred revenue
Fair Value Hierarchy and NAV [Domain]
us-gaap_DeferredTaxAssetsInventory
Inventories
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross
gnrc_FinanceAndOperatingLeaseRightofuseAsset
Finance and Operating Lease, Right-of-Use Asset
Amount of lessee's right to use underlying asset under finance and operating lease.
us-gaap_ExtendedProductWarrantyAccrual
Total
Balance at beginning of period
Balance at end of period
Accrued expenses
Property and equipment, estimated useful lives (Year)
us-gaap_ExtendedProductWarrantyAccrualCurrent
Current portion - other accrued liabilities
gnrc_FinanceAndOperatingLeaseLiability
Finance and operating Lease, Liability
Present value of lessee's discounted obligation for lease payments from finance and operating lease.
us-gaap_ExtendedProductWarrantyAccrualNoncurrent
Long-term portion - other long-term liabilities
Noncontrolling interests
Construction in Progress [Member]
Operating activities
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Bad debt
Revenue Recognition, Policy [Policy Text Block]
Deferred revenue contracts issued
Statement [Line Items]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accounts receivable, allowance for doubtful accounts
Current portion - other accrued liabilities
Accounts receivable
Accounts receivable, less allowance for doubtful accounts of $4,873 and $4,805 at December 31, 2018 and 2017, respectively
Long-term portion - other long-term liabilities
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
us-gaap_StandardProductWarrantyAccrual
Total
Balance at beginning of period
Balance at end of period
us-gaap_StandardProductWarrantyAccrualPayments
Payments
Additional paid-in capital
Stock-based compensation
Building and Building Improvements [Member]
Product warranty reserve assumed in acquisition
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Provision for warranty issued
AOCI Attributable to Parent [Member]
Changes in estimates for pre-existing warranties
Land and Land Improvements [Member]
Pension obligations
Schedule of Product Warranty Liability [Table Text Block]
Stockholders’ equity:
Land Improvements [Member]
Leasehold Improvements [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Other, net
Property, Plant and Equipment, Type [Axis]
us-gaap_NonoperatingIncomeExpense
Total other expense, net
Segment Reporting Disclosure [Text Block]
Product Warranty Disclosure [Text Block]
Property, Plant and Equipment, Type [Domain]
Operating loss and credit carryforwards
Current assets:
Redeemable noncontrolling interest
Inventory, Policy [Policy Text Block]
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
Investment income
Operating income
Income from operations
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
Net cash provided by operating activities
Net cash provided by operating activities
Other (expense) income:
Prepaid expenses and other assets
Net cash used in investing activities
Net cash used in investing activities
us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities
Effect of exchange rate changes on cash and cash equivalents
us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Net increase (decrease) in cash and cash equivalents
Goodwill and intangible assets
Gross profit
Gross Profit, Total
Gross profit
Base Rate [Member]
Costs of goods sold
Accounting Standards Update 2014-09 [Member]
Derivatives, Policy [Policy Text Block]
Debt refinancing costs
us-gaap_ContractWithCustomerLiability
Contract with Customer, Liability, Total
Accounting Standards Update 2016-02 [Member]
Type of Adoption [Domain]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Excess tax benefits from equity awards
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Payments Related to Tax Withholding for Share-based Compensation
Taxes paid related to equity awards
Depreciation
Prepaid expenses
Adjustments for New Accounting Pronouncements [Axis]
us-gaap_PaymentsOfDividendsCommonStock
Cash dividends paid
Restricted Stock and Performance Shares [Member]
Represents information about restricted stock and performance shares.
Board of Directors Chairman [Member]
Noncontrolling Interest [Member]
us-gaap_PaymentsForRepurchaseOfCommonStock
Payments for Repurchase of Common Stock
Stock repurchases
Retained Earnings [Member]
Proceeds from the exercise of stock options
Proceeds from Stock Options Exercised
Net sales
Revenue from Contract with Customer, Excluding Assessed Tax, Total
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State
Treasury Stock [Member]
State
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_StockRepurchaseProgramPeriodInForce1
Stock Repurchase Program, Period in Force
Foreign
Additional Paid-in Capital [Member]
Parent [Member]
us-gaap_CurrentFederalTaxExpenseBenefit
Federal
Common Stock [Member]
us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Authorized Amount
Federal
Deferred:
Other
us-gaap_OtherBorrowings
Equity Components [Axis]
us-gaap_DebtAndCapitalLeaseObligations
Total
Equity Component [Domain]
Real Estate [Member]
Current:
us-gaap_LongTermDebt
Long-term Debt, Total
us-gaap_CurrentIncomeTaxExpenseBenefit
Current
Capital lease obligation
us-gaap_CapitalLeaseObligations
Revenue performace obligation, expected timing (Year)
Revenue performance obligation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_ReclassificationFromAociCurrentPeriodTax
Reclassification from AOCI, Current Period, Tax, Total
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income before provision for income taxes
Income before provision for income taxes
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Other Comprehensive Income (Loss) before Reclassifications, Tax, Total
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Comprehensive Income (Loss) Note [Text Block]
Other comprehensive income (loss):
ABL facility
Long-term Line of Credit, Total
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
us-gaap_PaymentsOfDebtIssuanceCosts
Payment of debt issuance costs
State and Local Jurisdiction [Member]
us-gaap_DeferredFinanceCostsNet
Debt Issuance Costs, Net, Total
Vehicles [Member]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Disaggregation of Revenue [Table Text Block]
Foreign Tax Authority [Member]
Office Equipment [Member]
gnrc_DeferredCompensationArrangementWithIndividualSharesVested
Deferred Compensation Arrangement with Individual, Shares Vested
Number of shares vested during the period pursuant to the terms of a deferred compensation arrangement.
us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Repayments of long-term borrowings and capital lease obligations
Machinery and Equipment [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]
us-gaap_DebtInstrumentUnamortizedDiscount
Original issue discount and deferred financing costs
Receivables, Policy [Policy Text Block]
Term loan
us-gaap_DebtInstrumentCarryingAmount
us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefit, beginning of period
Unrecognized tax benefit, end of period
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
us-gaap_OpenTaxYear
Open Tax Year
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Statute of limitation expirations
Short-term borrowings
Short-term Debt, Total
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Settlements
us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Impact of adoption of certain accounting standards (Note 2)
Increase in unrecognized tax benefit for positions taken in current period
Long-term borrowings and capital lease obligations
Total
Proceeds from long-term borrowings
Cost of Sales [Member]
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Unrecognized Tax Benefits, Income Tax Penalties Expense
us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Unrecognized Tax Benefits, Interest on Income Taxes Expense
Charges to Reserve, Net
us-gaap_ValuationAllowancesAndReservesBalance
Balance at Beginning of Year
Balance at End of Year
Reserves Assumed in Acquisition
Additions Charged to Earnings
Income Statement Location [Axis]
Income Statement Location [Domain]
us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Redemption value adjustment
Redeemable noncontrolling interest redemption value adjustment
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price
Equity impact of the value of stock issued under equity incentive plans, net of shares withheld for employee taxes.
Excess Purchase Price over Predecessor Basis [Member]
The excess purchase price over predecessor basis.
Segments [Axis]
us-gaap_RepaymentsOfShortTermDebt
Repayments of short-term borrowings
Segments [Domain]
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares)
Number of shares issued under equity incentive plans, net of shares withheld for employee taxes.
Redeemable noncontrolling interest
us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Redeemable Noncontrolling Interest, Equity, Fair Value, Total
Redeemable Noncontrolling Interest [Table Text Block]
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
us-gaap_RepaymentsOfLinesOfCredit
Repayments of Lines of Credit
Weighted average common shares outstanding - diluted: (in shares)
Diluted shares (in shares)
Pro Forma [Member]
Proceeds from short-term borrowings
us-gaap_ProceedsFromLinesOfCredit
Proceeds from Lines of Credit, Total
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Statement [Table]
Scenario [Axis]
Scenario, Unspecified [Domain]
Statement of Financial Position [Abstract]
Net income attributable to common shareholders per common share - diluted: (in dollars per share)
Diluted (in dollars per share)
After 2023, operating leases
us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent
Share-based compensation
Weighted average common shares outstanding - basic: (in shares)
Weighted average shares, basic (in shares)
us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Total minimum lease payments, operating leases
us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Other
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective tax rate
Business Acquisition [Axis]
2022, operating leases
Tax Act impact
Net income attributable to common shareholders per common share - basic: (in dollars per share)
Basic (in dollars per share)
Business Acquisition, Acquiree [Domain]
gnrc_NumberOfMajorCustomers
Number of Major Customers
Represents number of major customers that accounts for 10 percent or more of the entity's revenues.
2023, operating leases
gnrc_AmortizationOfFinancingCostsAndDebtDiscountPremium
Amortization of Financing Costs and Debt Discount Premium
Amount of non-cash expense included in interest expense to issue and amortize debt discount and obtain financing associated with the related debt instruments.
2020, operating leases
Statement of Cash Flows [Abstract]
gnrc_DeferredCostsAmortizationExpenseYearTwo
Deferred Costs Amortization Expense, Year Two
Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred costs.
2021, operating leases
gnrc_DeferredCostsAmortizationExpenseNextTwelveMonths
Deferred Costs Amortization Expense, Next Twelve Months
Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for deferred costs.
gnrc_DeferredCostsAmortizationExpenseYearFour
Deferred Costs Amortization Expense, Year Four
Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred costs.
Statement of Stockholders' Equity [Abstract]
gnrc_DeferredCostsAmortizationExpenseYearThree
Deferred Costs Amortization Expense, Year Three
Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred costs.
gnrc_DeferredCostsAmortizationExpenseYearFive
Deferred Costs Amortization Expense, Year Five
Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred costs.
2019, operating leases
Income Statement [Abstract]
2021
2022
2019
2020
Quarterly Financial Information [Table Text Block]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Property Plant and Equipment, Estimated Useful Lives [Table Text Block]
Tabular disclosure for the useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
State taxes
Noncontrolling interest
us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Research and development credits
gnrc_SecuredLeverageRatio
Secured Leverage Ratio
Ratio used to calculate financial leverage and the ability to meet financial obligations. If the borrower's actual secured leverage ratio is below the 3.75 threshold for the annual period, the Excess Cash Flow payment requirement for that period is eliminated.
Financing activities
U.S. statutory rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Other long-term liabilities
Other long-term liabilities
Change in valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognized
Business Combination, Liabilities Arising from Contingencies, Amount Recognized
us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax
Deferred income taxes
us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Liabilities, Net, Noncurrent
Net unrealized gain on derivatives
Unrealized gain (loss) on interest rate swaps, tax
Fair Value of Derivatives
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
Net assets acquired
us-gaap_StockholdersEquity
Stockholders' equity attributable to Generac Holdings, Inc.
Retained earnings
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Payments to Acquire Businesses, Net of Cash Acquired, Total
Acquisition of business, net of cash acquired
Other liabilities
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
Class of Stock [Axis]
Total
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_PaymentsToAcquireBusinessesGross
Deposit paid related to acquisition
Domestic [Member]
Represents information regarding domestic reportable segment.
Interest Rate Swap [Member]
Accounts payable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Property and equipment
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
International [Member]
Represents information regarding international reportable segment.
Other assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets