v2.4.0.8
DEI Document (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Jan. 31, 2014
Jun. 30, 2013
Document Information [Abstract]      
Entity Registrant Name NuStar Energy L.P.    
Entity Central Index Key 0001110805    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY    
Trading Symbol ns    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   77,886,078  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 3,086