MEMBERS' EQUITY Table 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2015	$ (5,775)
Other comprehensive income (loss)	(3,265)
Balance as of March 31, 2015	(9,040)
Share of NuStar Energy's Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2015	(10,082)
Other comprehensive income (loss) before reclassification adjustments	(2,991)
Amounts reclassified to general and administrative expenses (a)	0
Other comprehensive income (loss)	(2,991)
Balance as of March 31, 2015	(13,073)
Pension and Other Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2015	4,307
Other comprehensive income (loss) before reclassification adjustments	0
Amounts reclassified to general and administrative expenses (a)	(274)
Other comprehensive income (loss)	(274)
Balance as of March 31, 2015	4,033
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2015	(5,775)
Other comprehensive income (loss) before reclassification adjustments	(2,991)
Amounts reclassified to general and administrative expenses (a)	(274)
Other comprehensive income (loss)	(3,265)
Balance as of March 31, 2015	$ (9,040)