v2.4.0.8
Document And Entity Information
3 Months Ended
Mar. 31, 2015
May 01, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name GENERAC HOLDINGS INC.  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   69,151,180
Amendment Flag false  
Entity Central Index Key 0001474735  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1