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Note 3 - Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 01, 2014
Aug. 01, 2013
Dec. 31, 2013
Sep. 30, 2013
Dec. 08, 2012
Jun. 30, 2013
Note 3 - Acquisitions (Details) [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired $ 61,196us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 116,113us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 47,044us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired            
Goodwill 635,565us-gaap_Goodwill 608,287us-gaap_Goodwill 552,943us-gaap_Goodwill     608,287us-gaap_Goodwill      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (4,877)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1                
Acquisition of MAC, Inc [Member]                  
Note 3 - Acquisitions (Details) [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired       55,690us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfMACIncMember		          
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill       49,378gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfMACIncMember		          
Goodwill       25,898us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfMACIncMember		          
Acquisition of Tower Light [Member]                  
Note 3 - Acquisitions (Details) [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired         80,239us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		        
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill             67,900gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		    
Goodwill             38,400us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		    
Business Combination, Consideration Transferred         85,812us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		        
Number of Countries in Which Subsidiary of Entity Built Leading Market Position in Equipment Rental Markets         50gnrc_NumberOfCountriesInWhichSubsidiaryOfEntityBuiltLeadingMarketPositionInEquipmentRentalMarkets
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		        
Restricted Cash and Cash Equivalents         6,645us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred 7,641us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		           (300)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 4,877us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		                
Additional Goodwill Recorded Under Revised Purchase Accounting Estimate           9,328gnrc_AdditionalGoodwillRecordedUnderRevisedPurchaseAccountingEstimate
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfTowerLightMember		      
Acquisition of Ottomores [Member]                  
Note 3 - Acquisitions (Details) [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired               44,769us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember		  
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill     16,100gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember		            
Goodwill     5,050us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember		            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred                 6,278us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember
Increase (Decrease) in Intangible Assets Non-current                 2,590gnrc_IncreaseDecreaseInIntangibleAssetsNonCurrent
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember
Goodwill, Period Increase (Decrease)                 $ 439us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
= gnrc_AcquisitionOfOttomoresMember