v3.3.1.900
RELATED PARTY TRANSACTIONS Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]      
Payable to related party $ 15,128   $ 14,799
Long-term payable to related party 33,537   32,080
NuStar GP LLC [Member]      
Related Party Transaction [Line Items]      
Payable to related party 15,100   14,800
Long-term payable to related party $ 33,500   $ 32,100
Axeon [Member] | Terminal Service Agreements [Member]      
Related Party Transaction [Line Items]      
Number of agreements   4  
Aggregate Storage Capacity   800,000  
Annual Service Charge   $ 1,500  
Axeon [Member] | Terminal Service Agreements 2 [Member]      
Related Party Transaction [Line Items]      
Aggregate Storage Capacity   600,000  
Annual Service Charge   $ 6,300  
NuStar GP LLC and Axeon [Member] | Services Agreement Between General Partner and Other Related Parties [Member]      
Related Party Transaction [Line Items]      
Administrative Fees, Description which provided that NuStar GP, LLC would furnish certain administrative and other operating services necessary to conduct the business of Axeon for an annual fee totaling $10.0 million, subject to adjustment    
Administrative Agreement Maturity Date Jun. 30, 2014