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Commitments and Contingencies (Details) (Customs and Disputed Duties in Japan [Member]) In Millions, unless otherwise specified | Dec. 31, 2013 USD ($) | Dec. 31, 2013 JPY (¥)
--- | --- | ---
Loss Contingencies [Line Items] |  |
Aggregate amount additional assessments | $ 40.2 | ¥ 4,200.0

X
- Definition The aggregate amount of assessments and disputed duties, net of any recovery of consumption taxes. + References No definition available. + Details
Name: | nus_AggregateAmountOfAssessmentsAndDisputedDuties
Namespace Prefix: | nus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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