Name:	nsh_EquityMethodInvestmentDistributionDatesandTotalsLineItems
Namespace Prefix:	nsh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Equity Method Investee's date of record for distribution of cash or unit to limited partner of partnership (LP), in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	nsh_EquityMethodInvestmentDistributionMadetoLimitedPartnerDateofRecord
Namespace Prefix:	nsh_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity Method Investee's per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

No definition available.

+ Details

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

- Definition

Equity Method Investee's date of announcement for distribution of cash, stock, or units to a member or limited partner of limited liability company (LLC) or limited partnership (LP), in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	nsh_EquityMethodInvestmentDistributionMadetoMemberorLimitedPartnerAnouncementDate
Namespace Prefix:	nsh_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity Method Investee's distribution payment date for distribution earned during the reporting period.

+ References

No definition available.

+ Details

Name:	nsh_EquityMethodInvestmentDistributionPaymentDate
Namespace Prefix:	nsh_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity method investee's total cash distributions earned for during the period for each class of partners.

+ References

No definition available.

+ Details

Name:	nsh_EquityMethodInvestmentTotalCashDistributions
Namespace Prefix:	nsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=us-gaap_EquityMethodInvesteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DISTRIBUTIONS FROM NUSTAR ENERGY Table 2 (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Apr. 22, 2015
NuStar Energy [Member]
Distributions from NuStar Energy (dates and totals)
NuStar Energy's cash distributions per unit applicable to limited partners (distribution earned)	$ 1.095	$ 1.095	$ 1.095
NuStar Energy's total cash distributions (distribution earned)	$ 98,051	$ 98,051	$ 98,051
NuStar Energy's distribution date of record (distribution earned)	May 08, 2015	Feb. 09, 2015
NuStar Energy's distribution payment date (distribution earned)	May 14, 2015	Feb. 13, 2015
Subsequent Event [Member]
Distributions from NuStar Energy (dates and totals)
NuStar Energy's distribution announcement date (distribution earned)				Apr. 22, 2015