v3.8.0.1

PARTNERS' EQUITY Narrative 1 (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($)
Partners' Capital Notes [Abstract]
Incentive distribution waiver	$ 22.0
Number of periods covered by waiver	10

X

- Definition

Maximum aggregate amount of incentive distribution payments the general partner agrees to forgo.

+ References

No definition available.

+ Details

Name:	ns_IncentiveDistributionWaiver
Namespace Prefix:	ns_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of consecutive quarters covering the incentive distribution waiver period.

+ References

No definition available.

+ Details

Name:	ns_NumberOfPeriodsCoveredByWaiver
Namespace Prefix:	ns_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_PartnersCapitalNotesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration