v2.4.0.6

ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details)	Mar. 31, 2012
Organizational Structure And Operations [Line Items]
Total ownership interest held by general partner	0.162

X

- Definition

The percentage investment held by the general partner of the limited partnership.

+ References

No definition available.

+ Details

Name:	ns_LimitedPartnershipGeneralPartnerOwnershipInterest
Namespace Prefix:	ns_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ns_OrganizationalStructureAndOperationsLineItems
Namespace Prefix:	ns_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration