v3.5.0.2

SUBSEQUENT EVENT Narrative (Details) - Subsequent Event [Member] $ in Millions	Oct. 14, 2016 USD ($) bbl
Subsequent Event [Line Items]
Purchase price of assets to be acquired, net | $	$ 93.0
Crude storage capacity, in barrels	900,000
Refined product storage capacity, in barrels	250,000

X

- Definition

Aggregate crude storage capacity of assets acquired or to be acquired in the acquisition, in barrels.

+ References

No definition available.

+ Details

Name:	ns_AcquiredCrudeStorageCapacity
Namespace Prefix:	ns_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate refined product storage capacity of assets acquired or to be acquired in the acquisition, in barrels.

+ References

No definition available.

+ Details

Name:	ns_AcquiredRefinedProductStorageCapacity
Namespace Prefix:	ns_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The net purchase price of assets to be acquired.

+ References

No definition available.

+ Details

Name:	ns_PurchasePriceOfAssetsToBeAcquiredNet
Namespace Prefix:	ns_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

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