CREDIT FACILITY Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Outstanding borrowings	26,000,000	$ 26,000,000
Borrowing availability	14,000,000
Weighted-average interest rate	2.20%
NuStar Energy Consolidated Debt Coverage Ratio [Member]
Line of Credit Facility [Line Items]
Covenant terms	The revolving credit facility contains customary restrictive covenants, such as limitations on indebtedness, liens, dispositions of material property, mergers, asset transfers and certain investing activities. In addition, the revolving credit facility requires NuStar Energy to maintain, as of the end of each rolling period of four consecutive fiscal quarters, a consolidated debt coverage ratio not to exceed 5.00-to-1.00. However, if NuStar Energy consummates one or more acquisitions for an aggregate net consideration of at least $50.0 million, the maximum consolidated debt coverage ratio will increase to 5.50-to-1.00 for two rolling periods. As of March 31, 2015, NuStar Energy’s consolidated debt coverage ratio was 4.1x and the maximum allowed amount was 5.50-to-1.00, as a result of the Linden Acquisition.
NuStar Energy's consolidated debt coverage ratio	4.1
Cash Distributions Covenant [Member]
Line of Credit Facility [Line Items]
Covenant terms	We are also required to receive cash distributions of at least $12.5 million in respect of our ownership interests in NuStar Energy each fiscal quarter
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity	40,000,000.0
Letters of credit capacity	10,000,000.0
Collateral	Our obligations under our revolving credit facility are guaranteed by Riverwalk Holdings, LLC (Riverwalk), a wholly owned subsidiary. Riverwalk pledged 1,792,918 NuStar Energy units that it owns to secure its guarantee.