v2.4.0.8
DEI Document
3 Months Ended
Mar. 31, 2014
Apr. 30, 2014
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-Q  
Document Period End Date Mar. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q1  
Trading Symbol ns  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   77,886,078