v2.4.0.8

SUBSEQUENT EVENTS (Details) (Sale of Asphalt JV Interest [Member], USD $) In Millions, unless otherwise specified | 2 Months Ended
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Feb. 26, 2014
Sale of Asphalt JV Interest [Member] |
Subsequent Event [Line Items] |
Percent Ownership Interest Sold | 50.00%
Ownership Percentage By Acquiring Entity | 100.00%
Maximum Amount Available Under Term Loan to Related Party | $ 190.0
Maximum Amount Available Under Term Loan to Related Party Step Down | $175.0 million on December 31, 2014 and then to $150.0 million on September 30, 2015
Term of Credit Support for Related Party | two years

X
- Definition Maximum Amount Available Under Term Loan to Related Party + References No definition available. + Details
Name: | ns_MaximumAmountAvailableUnderTermLoantoRelatedParty
Namespace Prefix: | ns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum Amount Available Under Term Loan to Related Party Step Down + References No definition available. + Details
Name: | ns_MaximumAmountAvailableUnderTermLoantoRelatedPartyStepDown
Namespace Prefix: | ns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Ownership percentage of entity being disposed of by acquiring entity + References No definition available. + Details
Name: | ns_OwnershipPercentageByAcquiringEntity
Namespace Prefix: | ns_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the ownership interest sold + References No definition available. + Details
Name: | ns_PercentOwnershipInterestSold
Namespace Prefix: | ns_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Describe the term of credit support provided for related party. + References No definition available. + Details
Name: | ns_TermofCreditSupportforRelatedParty
Namespace Prefix: | ns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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