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Note 13 - Income Taxes (Details) - Provision for Income Taxes (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 38,161us-gaap_CurrentFederalTaxExpenseBenefit	$ 48,287us-gaap_CurrentFederalTaxExpenseBenefit	$ 34,170us-gaap_CurrentFederalTaxExpenseBenefit
State	1,645us-gaap_CurrentStateAndLocalTaxExpenseBenefit	5,648us-gaap_CurrentStateAndLocalTaxExpenseBenefit	3,854us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	5,701us-gaap_CurrentForeignTaxExpenseBenefit	2,214us-gaap_CurrentForeignTaxExpenseBenefit	81us-gaap_CurrentForeignTaxExpenseBenefit
	45,507us-gaap_CurrentIncomeTaxExpenseBenefit	56,149us-gaap_CurrentIncomeTaxExpenseBenefit	38,105us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	42,474us-gaap_DeferredFederalIncomeTaxExpenseBenefit	42,003us-gaap_DeferredFederalIncomeTaxExpenseBenefit	21,972us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	(3,134)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	5,523us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	3,048us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	(1,462)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	167us-gaap_DeferredForeignIncomeTaxExpenseBenefit	25us-gaap_DeferredForeignIncomeTaxExpenseBenefit
	37,878gnrc_DeferredIncomeTaxExpenseBenefitBeforeAdjustmentOfValuationAllowance	47,693gnrc_DeferredIncomeTaxExpenseBenefitBeforeAdjustmentOfValuationAllowance	25,045gnrc_DeferredIncomeTaxExpenseBenefitBeforeAdjustmentOfValuationAllowance
Change in valuation allowance	364us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	335us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(21)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Provision for income taxes	$ 83,749us-gaap_IncomeTaxExpenseBenefit	$ 104,177us-gaap_IncomeTaxExpenseBenefit	$ 63,129us-gaap_IncomeTaxExpenseBenefit

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