v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 05, 2012
Jun. 30, 2011
Entity Registrant Name GENERAC HOLDINGS INC.    
Entity Central Index Key 0001474735    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 494,323,000
Entity Common Stock, Shares Outstanding   67,906,706  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011