v2.4.0.6
Document And Entity Information (USD $)
9 Months Ended
Sep. 30, 2011
Nov. 07, 2011
Jun. 30, 2010
Entity Registrant Name GENERAC HOLDINGS INC.    
Entity Central Index Key 0001474735    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 295,142,000
Entity Common Stock, Shares Outstanding   67,603,255  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q3    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 30, 2011