SUBSEQUENT EVENTS Narrative 3 (Details) - NuStar Energy Logistics Notes Due 2027 [Member] - Subsequent Event [Member] $ in Millions	3 Months Ended
Jun. 30, 2017 USD ($)
Subsequent Event [Line Items]
NuStar Energy's senior notes interest rate	5.625%
NuStar Energy's senior note issuance	$ 550.0
NuStar Energy's net proceeds from senior note issuance	$ 543.8

Sum of equity method investee's carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

No definition available.

Name:	nsh_EquityMethodInvestmentSummarizedFinancialInformationLongTermDebtNoncurrent
Namespace Prefix:	nsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant