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Cost of Sales (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cost of Sales [Abstract] |  |  |  |
Customs expense | $ 31,400 | $ 0 | $ 31,355 | $ 0

X
- Definition A noncash adjustment for the amount related to a ruling issued by the Tokyo District Court on a dispute between the Company and the customs authorities in Japan. The District Court upheld previous customs assessments related to the importation of several of the Company's products into Japan. + References No definition available. + Details
Name: | nus_CustomsExpense
Namespace Prefix: | nus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CostOfGoodsSoldAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration