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 - Redeemable Noncontrolling Interest
Note 5 - Derivative Instruments and Hedging Activities
Note 6 - Accumulated Other Comprehensive Loss
Schedule Of Intangible Assets [Table Text Block]
Tabular disclosure of intangible assets, by major asset class.
Not Designated as Hedging Instrument [Member]
Note 7 - Segment Reporting
Proceeds from beneficial interest in securitization transactions
Note 8 - Balance Sheet Details
Prepaid expenses and other assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
Note 9 - Goodwill and Intangible Assets
Accounts receivable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
Income Tax Disclosure [Text Block]
Note 10 - Leases
Note 11 - Product Warranty Obligations
Hedging Designation [Axis]
Note 12 - Credit Agreements
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 - Earnings Per Share
Inventories
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
Expected stock price volatility
Note 15 - Income Taxes
us-gaap_LiabilitiesCurrent
Total current liabilities
Schedule of Maturities of Long-term Debt [Table Text Block]
Note 17 - Share Plans
Note 19 - Quarterly Financial Information (Unaudited)
gnrc_BusinessOptimizationExpense
Business optimization and other charges (6)
Represents charges relating to business optimization and restructuring costs.
Note 20 - Valuation and Qualifying Accounts
Note 2 - Summary of Accounting Policies - Summary of Allowance for Doubtful Accounts (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 - Property and Equipment Estimated Useful Lives (Details)
Note 3 - Acquisitions - Preliminary Price Allocation (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 - Unaudited Pro Forma Information (Details)
Note 4 - Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest (Details)
Note 5 - 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 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details)
Note 6 - Accumulated Other Comprehensive Loss - Reclassifications from AOCL (Details)
Note 7 - Segment Reporting - Net Sales by Products and Services (Details)
Note 7 - Segment Reporting - Segment Information (Details)
Note 8 - Balance Sheet Details - Inventories (Details)
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Note 8 - Balance Sheet Details - Property and Equipment (Details)
Note 9 - Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details)
Granted (in dollars per share)
Note 9 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details)
Foreign currency translation adjustment
us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Business Acquisition, Percentage of Voting Interests Acquired
us-gaap_DerivativeNumberOfInstrumentsHeld
Derivative, Number of Instruments Held, Total
Note 10 - Leases - Leases Cost (Details)
Vested (in dollars per share)
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Note 10 - Leases - Supplement Balance Sheet Information Related to Leases (Details)
Forfeited (in dollars per share)
Note 10 - Leases - Supplement Cash Flow Information Related to Leases (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Non-vested (in dollars per share)
Non-vested (in dollars per share)
Note 10 - Leases - Weighted Average Remaining Lease Term and Discount Rate Information (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited (in shares)
Note 10 - Leases - Maturities of Lease liabilities (Details)
Note 11 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Non-vested (in shares)
Non-vested (in shares)
us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Foreign currency translation adjustment
Note 11 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties (Details)
us-gaap_GoodwillAndIntangibleAssetImpairment
Goodwill and Intangible Asset Impairment, Total
Note 11 - Product Warranty Obligations - Recognition of Deferred Revenue Related to Extended Warranties 2 (Details)
Current portion of long-term borrowings and finance lease obligations
Note 11 - Product Warranty Obligations - Deferred Product Obligations (Details)
gnrc_PerformanceShareAwardPercentage
Performance Share Award, Percentage
The percentage of the target performance share award.
Note 12 - Credit Agreements - Short-term Borrowings (Details)
Granted (in shares)
Note 12 - Credit Agreements - Long-term Borrowings (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested (in shares)
Note 12 - Credit Agreements - Maturities of Long-term Borrowings Outstanding (Details)
Note 14 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details)
Note 15 - Income Taxes - Provision for Income Taxes (Details)
Less: current portion of debt
Note 15 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details)
Note 15 - Income Taxes - Unrecognized Tax Benefits (Details)
Note 15 - Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]
us-gaap_OtherComprehensiveIncomeLossNetOfTax
Net current-period other comprehensive income (loss)
Note 17 - Share Plans - Weighted-average Assumptions used in the Black-Scholes-Merton Option Pricing Model (Details)
Note 17 - Share Plans - Summary of Stock Option Activity (Details)
Exercisable, weighted average exercise price (in dollars per share)
Note 17 - Share Plans - Summary of Restricted Share Awards Activity (Details)
Exercisable, weighted average remaining contractual term (Year)
Note 19 - Quarterly Financial Information (Unaudited) - Unaudited Quarterly Financial Information (Details)
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Other Comprehensive Income (Loss), before Reclassifications, before Tax
Exercisable, aggregate intrinsic value
Note 20 - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details)
Pika [Member]
Related to Pika.
Foreign Exchange Contract [Member]
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Amortization of net loss
Notes To Financial Statements
Commodity Contract [Member]
Notes To Financial Statements [Abstract]
Other comprehensive income (loss) before reclassifications
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Amounts reclassified from AOCL during 2019
Amounts reclassified from AOCL
us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total stockholders’ equity
Balance
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)
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 (in dollars per share)
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]
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
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Trade Names [Member]
Capital expenditures
Expenditures for property and equipment
us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive effect of stock compensation awards (1) (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
Income taxes
Noncompete Agreements [Member]
Current liabilities:
Supplemental Balance Sheet Disclosures [Text Block]
Treasury Stock [Text Block]
Assets
Total assets
Supplemental disclosure of cash flow information
Plan Name [Axis]
Plan Name [Domain]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Customer Lists [Member]
us-gaap_DeferredIncomeTaxAssetsNet
Deferred Income Tax Assets, Net, Total
Computer Software, Intangible Asset [Member]
us-gaap_CapitalizedContractCostNet
Capitalized Contract Cost, Net, Total
Share-based Payment Arrangement [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]
Award Type [Domain]
After 2024
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
Total
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]
As reported
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.
Finite-lived intangible assets, gross
Restricted Stock [Member]
Net income attributable to noncontrolling interests
Performance Shares [Member]
Share-based Payment Arrangement, Option [Member]
Net income
us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
Foreign currency translation
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
us-gaap_GoodwillAcquiredDuringPeriod
Acquisitions of businesses, net
Indefinite-lived tradenames, gross
gnrc_NetIncomeLossAvailableToCommonStockholders
Net income attributable to common shareholders
Net income after adjustments for redeemable noncontrolling interest redemption value.
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
us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
Change in noncontrolling interest share
Property and equipment, net
Total
Goodwill
Goodwill
Goodwill, Ending Balance
Balance
Balance
us-gaap_PropertyPlantAndEquipmentGross
Property and equipment, gross
us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
Balance
Balance
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
gnrc_SharebasedCompensationArrangementBySharebasedPaymentAwardPerformanceMeasurementPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Performance Measurement, Period (Year)
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.
Net income
us-gaap_TemporaryEquityNetIncome
Foreign currency translation
us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
us-gaap_AccountsReceivableGross
Accounts Receivable, before Allowance for Credit Loss
Net income
us-gaap_ProfitLoss
Net income
us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Total comprehensive income
Leases of Lessee Disclosure [Text Block]
Net income
Derivative Instrument [Axis]
Derivative Contract [Domain]
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]
Adoption of ASU 2016-13
Represents increase in allowance for doubtful accounts receivable due to adopting new accounting standard.
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
Provision for income taxes
Income tax impact
Provision for income taxes
gnrc_TemporaryEquityAcquired
Noncontrolling interest
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
Depreciation and Amortization
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Amount includes additional accelerated depreciation recognized in the current period.
Reserves Assumed in Acquisition
Amount of increase (decrease) in valuation and qualifying accounts and reserves from business combination.
gnrc_ExcessPurchasePriceOverPredecessorBasis
Excess purchase price over predecessor basis
The element that represents the excess purchase price over predecessor basis.
Other Accrued Liabilities [Member]
Related to other accrued liabilities.
Operating Lease and Other Assets [Member]
Related to operating lease and other assets.
us-gaap_OperatingExpenses
Total operating expenses
us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Pension liability adjustment, tax
us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Cost
Operating Lease and Other Long-term Liabilities [Member]
Related to operating lease and other long-term liabilities.
General and administrative
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Cash and cash equivalents
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.
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
us-gaap_AllocatedShareBasedCompensationExpense
Share-based Payment Arrangement, Expense
gnrc_NumberOfNewContractsEntered
Number of New Contracts Entered
Number of new contracts entered into during the period mentioned.
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.
Other Accrued Liabilities and Operating Lease and Other Long-term Liabilities [Member]
Primary financial statement caption encompassing other accrued liabilities and operating lease and other long-term liabilities.
Schedule Of Derivative Assets (Liabilities) at Fair Value [Table Text Block]
Tabular disclosure of derivative assets and liabilities at fair value.
Amendment Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income attributable to Generac Holdings Inc.
City Area Code
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)
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
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 (in 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
us-gaap_LeaseCost
Total lease cost
us-gaap_DebtInstrumentFairValue
Debt Instrument, Fair Value Disclosure, Total
Operating Leases
Document Fiscal Period Focus
Operating lease cost
Document Fiscal Year Focus
Consolidation, Policy [Policy Text Block]
Lease, Cost [Table Text Block]
Finance leases
Document Period End Date
Operating leases
Operating Leases (Year)
Entity File Number
us-gaap_DebtInstrumentFeeAmount
Debt Instrument, Fee Amount
Entity Emerging Growth Company
Document Type
Loss on extinguishment of debt
Gain (Loss) on Extinguishment of Debt, Total
Loss on extinguishment of debt
Entity Small Business
Entity Shell Company
us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement
Document Information [Line Items]
Document Information [Table]
Entity Public Float
Entity Filer Category
Entity Current Reporting Status
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
London Interbank Offered Rate (LIBOR) [Member]
Variable Rate [Domain]
gnrc_ThresholdForSecuredLeverageRatioExcessCashFlowPaymentRequirement
Threshold for Secured Leverage Ratio Excess Cash Flow Payment Requirement
The threshold for secured leverage ration required for the excess cash flow payment requirement.
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
Share-based compensation
Quarterly Financial Information [Text Block]
Entity Tax Identification Number
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.
Entity Address, Address Line One
Amortization of intangible assets
Amortization of intangibles
Amortization of Intangible Assets, Total
us-gaap_TreasuryStockValueAcquiredCostMethod
Net share settlement of restricted stock awards
Entity Address, City or Town
Geographic Concentration Risk [Member]
Entity Address, Postal Zip Code
Dies and Tools [Member]
Tangible personal property used to produce goods and services.
Entity Address, State or Province
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts Receivable, Allowance for Credit Loss, Ending Balance
Balance
Balance
us-gaap_TreasuryStockValue
Treasury stock, at cost, 9,173,731 and 9,103,013 shares at December 31, 2020 and 2019, respectively
Entity Common Stock, Shares Outstanding
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
Revenue Benchmark [Member]
Accounts Receivable [Member]
Net Assets, Geographic Area [Member]
Product Warranty Obligations Included In Consolidated Balance Sheet [Table Text Block]
Product warranty obligations included in consolidated balance sheet.
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
The 2019 Acquisitions [Member]
Represent the business acquisitions in 2019.
Concentration Risk Benchmark [Axis]
The 2020 Acquisitions [Member]
Represents the business acquisitions in 2020.
Concentration Risk Benchmark [Domain]
Local Phone Number
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.
Loss on pension settlement
Loss on pension settlement
Loss on pension settlement
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Amended ABL Facility [Member]
The description or name of the credit facility.
Provision for credit losses
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)
gnrc_DerivativeNumberOfInstrumentsOutstanding
Derivative, Number of Instruments Outstanding
The number of derivative instruments outstanding.
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.
Raw material
Currency translation
Amount of increase (decrease) in allowance for credit loss on accounts receivable, from currency translation.
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders’ equity
Finished goods
Work-in-process
UNITED STATES
Research and development
Research and Development Expense, Total
Retained earnings
Retained Earnings (Accumulated Deficit), Ending Balance
Accumulated other comprehensive loss
Schedule of Short-term Debt [Table Text Block]
Debt Disclosure [Text Block]
us-gaap_InterestExpense
Interest expense
Net changes in operating assets and liabilities, net of acquisitions:
gnrc_DeferredCompensationArrangementWithIndividualSharesGranted
Deferred Compensation Arrangement with Individual, Shares Granted (in shares)
The number of shares granted in a deferred compensation arrangement with an individual.
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]
us-gaap_OtherNoncashIncomeExpense
Other
Operating lease liabilities - noncurrent (3)
Schedule of Inventory, Current [Table Text Block]
Total operating lease liabilities
Operating Lease, Liability, Total
Operating lease liabilities - current (2)
Other intangible assets, net
Finance lease liabilities - current (5)
Retirement Benefits [Text Block]
Finance lease liabilities - noncurrent (6)
Total intangible assets, gross
Subsequent Events [Text Block]
Operating lease ROU assets (1)
Operating Lease, Right-of-Use Asset
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total minimum lease payments, operating leases
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Interest component
Total finance lease liabilities
Present value of minimum lease payments, finance leases
Financing cash flows from finance leases
us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred income taxes
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2023, operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2024, operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2025, operating leases
us-gaap_FinanceLeaseRightOfUseAsset
Finance lease ROU assets, net (4)
us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Deferred Compensation Arrangement with Individual, Compensation Expense
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
After 2023, operating leases
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Finite-Lived Intangible Asset, Expected Amortization, Year Two
Fair Value of Financial Instruments, Policy [Policy Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Finite-Lived Intangible Asset, Expected Amortization, Year Three
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Asset, Expected Amortization, Year Four
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2021, operating leases
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Finite-Lived Intangible Asset, Expected Amortization, Year Five
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2022, operating leases
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Finite-Lived Intangible Asset, Expected Amortization, Year One
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Excess tax benefits from equity awards
us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Equity Incentive Plan (Plan) [Member]
Represents the equity incentive plan (Plan).
us-gaap_ShareBasedCompensation
Share-based compensation expense
Non-cash share-based compensation expense (2)
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Finite-lived intangible assets, useful life (Year)
Amortization of original issue discount and deferred financing costs
Operating expenses:
Income Tax, Policy [Policy Text Block]
us-gaap_LesseeOperatingLeaseRenewalTerm
Lessee, Operating Lease, Renewal Term (Year)
Research and Development Expense, Policy [Policy Text Block]
Depreciation
us-gaap_Depreciation
Depreciation, Total
us-gaap_DepreciationDepletionAndAmortization
Depreciation and amortization
us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)
us-gaap_AssetsCurrent
Total current assets
Share-based Payment Arrangement [Policy Text Block]
gnrc_BusinessAcquisitionNoncontrollingInterestTermOfPutOption
Business Acquisition, Noncontrolling Interest, Term of Put Option (Year)
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 Cost [Policy Text Block]
Common stock, par value $0.01, 500,000,000 shares authorized, 72,024,329 and 71,667,726 shares issued at December 31, 2020 and 2019, respectively
Adjustments to reconcile net income to net cash provided by operating activities:
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)
Redeemable Noncontrolling Interest [Text Block]
Entire disclosure for redeemable noncontrolling interest.
Established for Acquisitions
Represents increase in allowance for doubtful accounts receivable from Establishment for Acquisitions
Common stock, par value (in dollars per share)
gnrc_ExtendedWarrantyTerm
Extended Warranty Term (Year)
Expiration period of the extended warranty.
Revenue from Contract with Customer [Policy Text Block]
Selmec [Member]
Represents the information pertaining to Selmec.
us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowance
Statistical Measurement [Domain]
Operating cash flows from operating leases
Maximum [Member]
Minimum [Member]
Ownership [Domain]
Product and Service [Axis]
Product and Service [Domain]
us-gaap_DeferredTaxAssetsNet
Total deferred tax assets
Statistical Measurement [Axis]
Operating cash flows from finance leases
us-gaap_OperatingLeasesRentExpenseNet
Operating Leases, Rent Expense, Net, Total
Debt, Policy [Policy Text Block]
Ownership [Axis]
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
Total
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 2 [Member]
Fair Value Hierarchy and NAV [Axis]
us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross
us-gaap_ExtendedProductWarrantyAccrual
Total
Balance at beginning of period
Balance at end of period
Patents and Technology [Member]
Represents finite-lived intangible assets classified as patents and technology.
Accrued expenses
Cumulative Effect, Period of Adoption [Domain]
Cumulative Effect, Period of Adoption [Axis]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Property and equipment, estimated useful lives (Year)
us-gaap_ExtendedProductWarrantyAccrualCurrent
Current portion - other accrued liabilities
us-gaap_ExtendedProductWarrantyAccrualNoncurrent
Long-term portion - other long-term liabilities
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Construction in Progress [Member]
Noncontrolling interests
Operating activities
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Bad debt
gnrc_NoncontrollingInterestAgreementExtensionOfTerm
Noncontrolling Interest Agreement, Extension of Term (Year)
The extension of the term in the noncontrolling interest agreement.
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, less allowance for credit losses of $12,001 and $6,968 at December 31, 2020 and 2019, 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 Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Redeemable non-controlling interest
gnrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRedeemableNoncontrollingInterest
Amount of redeemable non-controlling interest assumed at the acquisition date.
Provision for warranty issued
AOCI Attributable to Parent [Member]
Land and Land Improvements [Member]
Changes in estimates for pre-existing warranties
Schedule of Product Warranty Liability [Table Text Block]
Stockholders’ equity:
Land Improvements [Member]
Leasehold Improvements [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Board of Directors Chairman [Member]
Other, net
Long-Lived Tangible Asset [Axis]
us-gaap_NonoperatingIncomeExpense
Total other expense, net
Segment Reporting Disclosure [Text Block]
Product Warranty Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Operating loss and credit carryforwards
Current assets:
Redeemable noncontrolling interest
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Inventory, Policy [Policy Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase in cash and cash equivalents
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
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
Other (expense) income:
Prepaid expenses and other assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities
Effect of exchange rate changes on cash and cash equivalents
Goodwill and intangible assets
Gross profit
Gross profit
Acquisition of Enbala [Member]
Represents acquisition of Enbala.
Base Rate [Member]
Costs of goods sold
Derivatives, Policy [Policy Text Block]
Deferred income taxes
us-gaap_DeferredIncomeTaxLiabilitiesNet
Deferred Income Tax Liabilities, Net, Total
Debt refinancing costs
us-gaap_ContractWithCustomerLiability
Contract with Customer, Liability, Total
Accounting Standards Update 2016-02 [Member]
Neurio [Member]
Represents information related to Neurio.
Operating lease and other long-term liabilities
Present value of lessee's discounted obligation for lease payments from operating lease, and other liabilities classified as noncurrent.
Operating lease and other assets
Amount of lessee's right to use underlying asset under operating lease and other assets after one year or beyond the normal operating cycle, if longer.
us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities
Payment of contingent acquisition consideration
Accounting Standards Update [Domain]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Payment, Tax Withholding, Share-based Payment Arrangement
Taxes paid related to equity awards
Depreciation
Prepaid expenses
Accounting Standards Update [Axis]
Schedule of Components of Lease Assets and Liabilities [Table Text Block]
Tabular disclosure of components of lease assets and liabilities.
gnrc_LesseeOperatingLeaseAndFinanceLeaseRemainingTermOfContract
Lessee, Operating Lease and Finance Lease, Remaining Term of Contract (Year)
Remaining term of lessee's operating lease and finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
Schedule of Leases Cash Flow Information [Table Text Block]
Tabular disclosure of leases related to cash flow information.
gnrc_FinanceLeaseRightOfUseAssetAccumulatedDepreciation
Accumulated depreciation - finance lease ROU assets
Amount of accumulated depreciation for finance lease right of use assets.
Finance lease ROU assets, gross
Gross amount of lessee's right to use underlying asset under finance lease.
us-gaap_PaymentsOfDividendsCommonStock
Cash dividends paid to noncontrolling interest of subsidiary
Operating and Finance Lease, Liability, Maturity [Table Text Block]
Tabular disclosure of undiscounted cash flows of operating and finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liability recognized in statement of financial position.
Restricted Stock and Performance Shares [Member]
Represents information about restricted stock and performance shares.
Lease, Term and Discount Rate [Table Text Block]
Tabular disclosure of term and discount rate of lease.
Pro Forma [Member]
Noncontrolling Interest [Member]
us-gaap_PaymentsForRepurchaseOfCommonStock
Payments for Repurchase of Common Stock
Stock repurchases
Scenario [Domain]
Retained Earnings [Member]
Proceeds from the exercise of stock options
Proceeds from Stock Options Exercised
Net sales
us-gaap_TreasuryStockAcquiredAverageCostPerShare
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)
Title of Individual [Domain]
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State
Treasury Stock [Member]
Title of Individual [Axis]
State
Scenario [Axis]
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_StockRepurchaseProgramPeriodInForce1
Stock Repurchase Program, Period in Force (Month)
Foreign
Additional Paid-in Capital [Member]
Accounting Standards Update 2016-13 [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]
Current:
us-gaap_LongTermDebt
Long-term Debt, Total
us-gaap_CurrentIncomeTaxExpenseBenefit
Total
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)
Revenue performance obligation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Total before tax
Income before provision for income taxes
us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax
Other Comprehensive Income (Loss) before Reclassifications, Tax, Total
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
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]
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
us-gaap_PaymentsOfDebtIssuanceCosts
Payment of debt issuance costs
us-gaap_DeferredFinanceCostsNet
Debt Issuance Costs, Net, Total
Vehicles [Member]
Disaggregation of Revenue [Table Text Block]
us-gaap_RepaymentsOfLongTermDebt
Repayments of Long-term Debt, Total
Office Equipment [Member]
us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Repayments of long-term borrowings and finance lease obligations
Document Annual Report
Machinery and Equipment [Member]
Cash and Cash Equivalents, Policy [Policy Text Block]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
us-gaap_DebtInstrumentUnamortizedDiscount
Original issue discount and deferred financing costs
Receivable [Policy Text Block]
Entity Incorporation, State or Country Code
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]
Document Transition Report
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Statute of limitation expirations
Short-term borrowings
Short-term Debt, Total
Entity Interactive Data Current
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Settlements
Increase in unrecognized tax benefit for positions taken in prior period
Security Exchange Name
Increase in unrecognized tax benefit for positions taken in current period
Title of 12(b) Security
us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Charge-offs
Long-term borrowings and finance 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
Beginning
Balance at End of Year
Additions Charged to Earnings
Income Statement Location [Axis]
Allowance for credit losses
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.
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 (in shares)
us-gaap_RepaymentsOfLinesOfCredit
Repayments of Lines of Credit
Weighted average common shares outstanding - diluted: (in shares)
Diluted shares (in shares)
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]
Statement of Financial Position [Abstract]
Net income attributable to common shareholders per common share - diluted: (in dollars per share)
As reported (in dollars per share)
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)
us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent
Share-based compensation
Weighted average common shares outstanding - basic: (in shares)
Weighted average shares, basic (in shares)
us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Other
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective tax rate
Business Acquisition [Axis]
Tax Act impact
Net income attributable to common shareholders per common share - basic: (in dollars per share)
us-gaap_EarningsPerShareBasic
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)
gnrc_NumberOfMajorCustomers
Number of Major Customers
Represents number of major customers that accounts for 10 percent or more of the entity's revenues.
Business Acquisition, Acquiree [Domain]
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.
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.
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.
Income Statement [Abstract]
2023
2024
2021
2022
Quarterly Financial Information [Table Text Block]
Interest on lease liabilities
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.
us-gaap_FinanceLeaseLiabilityPaymentsDue
Total minimum lease payments, finance leases
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Amortization of ROU assets
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive
2025, finance leases
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive
After 2023, finance leases
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount
Interest component
us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
2021, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo
2022, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree
2023, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour
2024, finance leases
gnrc_BusinessCombinationLiabilitiesArisingFromContingenciesOtherFairValueRemeasurementAdjustments
Business Combination, Liabilities Arising from Contingencies, Other Fair Value Re-measurement Adjustments
Represents the other fair Value re-measurement adjustments related to liabilities arising from contingencies in a business acquisition.
Finance Leases
gnrc_BusinessCombinationLiabilitiesArisingFromContingenciesInterestAccretion
Business Combination, Liabilities Arising from Contingencies, Interest Accretion
Represents the interest accretion related to liabilities arising from contingencies in a business acquisition.
gnrc_BusinessCombinationLiabilitiesArisingFromContingenciesChangesInFairValue
Business Combination, Liabilities Arising from Contingencies, Changes in Fair Value
Represents the changes in fair value of liabilities arising from contingencies in a business acquisition.
gnrc_BusinessAcquisitionTermOfCallOption
Business Acquisition, Term of Call Option (Year)
The term of call option available to the company in a business acquisition transaction.
State taxes
Captiva Energy Solutions [Member]
Represents information about Captiva Energy Solutions.
The 2019 Equity Incentive Plan [Member]
Information related to the 2019 Equity Incentive Plan.
Finance Leases (Year)
Accrued wages and employee benefits
gnrc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedWagesAndEmployeeBenefits
Amount of accrued wages and employee benefits due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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
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
Net unrealized gain (loss) on derivatives
Unrealized gain (loss) on interest rate swaps, tax
Fair Value of Derivatives
Patents and technology, net
Represents the carrying amount of finite-lived patents and technology as of balance sheet date.
State tax rate differential
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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit)
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Net assets acquired
us-gaap_StockholdersEquity
Stockholders’ equity attributable to Generac Holdings Inc.
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Payments to Acquire Businesses, Net of Cash Acquired, Total
Acquisition of business, net of cash acquired
Other long-term liabilities
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
Class of Stock [Axis]
Total
Deferred income taxes
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Current portion of long-term debt
Other accrued liabilities
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
Domestic [Member]
Represents information regarding domestic reportable segment.
Interest Rate Swap [Member]
Accounts payable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Deferred income taxes
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets
Property and equipment
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
International [Member]
Represents information regarding international reportable segment.
Other assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets