Name:	nsh_ConversionRateOfCommonUnitsForMerger
Namespace Prefix:	nsh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Equity Method Investee's expected per unit quarterly distribution annualized to common limited partners to be declared and paid.

No definition available.

Name:	nsh_EquityMethodInvestmentExpectedPerUnitQuarterlyDistributionAnnualizedToCommonLimitedPartners
Namespace Prefix:	nsh_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Equity Method Investee's expected per unit quarterly distribution to common limited partners to be declared and paid.

No definition available.

Name:	nsh_EquityMethodInvestmentExpectedPerUnitQuarterlyDistributionToCommonLimitedPartners
Namespace Prefix:	nsh_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The ownership of limited partner common units in the investee accounted for under the equity method of accounting.

No definition available.

Name:	nsh_EquityMethodInvestmentOwnershipLimitedPartnerUnits
Namespace Prefix:	nsh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Percentage investment held by Greehey Unitholders in NuStar GP, LLC.

No definition available.

Name:	nsh_GreeheyUnitholdersOwnershipPercentage
Namespace Prefix:	nsh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.