MEMBERS' EQUITY Table 2 (Details) - USD ($) $ in Thousands		6 Months Ended
	Mar. 01, 2016	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016		$ (8,664)
Employee Transfer (b)	$ (4,201)
Other comprehensive loss		(10,184)
Balance as of June 30, 2016		(18,848)
Share of NuStar Energy's Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016		(13,189)
Other comprehensive loss before reclassification adjustments		(5,659)
Amounts reclassified to general and administrative expenses (a)		0
Employee Transfer (b)		0
Other comprehensive loss		(5,659)
Balance as of June 30, 2016		(18,848)
Pension and Other Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016		4,525
Other comprehensive loss before reclassification adjustments		0
Amounts reclassified to general and administrative expenses (a)		(324)
Employee Transfer (b)		(4,201)
Other comprehensive loss		(4,525)
Balance as of June 30, 2016		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Tax effect of Employee Transfer	$ 2,400
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2016		(8,664)
Other comprehensive loss before reclassification adjustments		(5,659)
Amounts reclassified to general and administrative expenses (a)		(324)
Employee Transfer (b)		(4,201)
Other comprehensive loss		(10,184)
Balance as of June 30, 2016		$ (18,848)