Annual report pursuant to section 13 and 15(d)

Document and Entity Information Document

v2.4.0.6
Document and Entity Information Document (USD $)
12 Months Ended
Dec. 31, 2012
Mar. 01, 2013
Jun. 30, 2012
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, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q4    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   62,464,123  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 129,500,553