Annual report pursuant to section 13 and 15(d)

Document Entity Information

v2.4.0.6
Document Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 01, 2012
Jun. 30, 2011
Document and Entity Information      
Entity Registrant Name Alon USA Energy, Inc.    
Entity Central Index Key 0001325955    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2011    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q4    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   56,107,986  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 145,270,762