Income Taxes, Tax Cuts and Jobs Act (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Tax Cuts and Jobs Act of 2017 [Abstract]
Provisional tax detriment for effects of Tax Reform Act	$ 47.7

Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

No definition available.

Name:	nus_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit
Namespace Prefix:	nus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration