RELATED PARTY TRANSACTIONS Narrative 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013 Axeon Services Agreement [Member] Axeon [Member]	Sep. 30, 2014 Axeon Services Agreement [Member] Axeon [Member]	Sep. 30, 2013 Axeon Services Agreement [Member] Axeon [Member]	Feb. 26, 2014 Axeon [Member] NuStar Energy [Member]	Sep. 30, 2014 GP Services Agreement [Member] NuStar Energy [Member]	Sep. 30, 2013 GP Services Agreement [Member] NuStar Energy [Member]	Sep. 30, 2014 GP Services Agreement [Member] NuStar Energy [Member]	Sep. 30, 2013 GP Services Agreement [Member] NuStar Energy [Member]
Related Party Transaction [Line Items]
Services Agreements, Description		provided that NuStar GP, LLC 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 (the Axeon Services Agreement).					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					$ 0.4	$ 0.4	$ 1.3	$ 1.0
Equity Method Investment Percent Voting Interest Sold				50.00%
Ownership Percentage By Acquiring Entity				100.00%
Administrative Agreement, Termination Date		Jun. 30, 2014
Administrative Services Expense	$ 1.6	$ 3.1	$ 6.3