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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

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- 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

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- References

No definition available.

+ Details

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