RELATED PARTY TRANSACTIONS Narrative 2 (Details) (GP Services Agreement [Member], NuStar Energy [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
GP Services Agreement [Member] | NuStar Energy [Member]
Related Party Transaction [Line Items]
Services agreements, description	The GP Services Agreement provides that NuStar GP, LLC will furnish administrative and certain operating services necessary to conduct the business of NuStar Energy. All employees providing services to both NuStar GP Holdings and NuStar Energy are employed by NuStar GP, LLC; therefore, NuStar Energy reimburses NuStar GP, LLC for all employee costs, other than the expenses allocated to NuStar GP Holdings
Services agreements, termination date	Dec. 31, 2014
Administrative services expense	$ 0.5	$ 0.4