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NET INCOME (LOSS) PER UNIT Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding options to purchase NuStar GP Holdings units 289,100 300,766 293,715 301,107