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Executive Deferred Compensation Plan (Details) - Executive [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Executive Deferred Compensation Plan [Abstract]
Percentage of matching contribution maximum	10.00%
Percentage of compensation deferred, maximum	80.00%
Percentage of bonus deferred, maximum	100.00%
Percentage vested after ten years of service	50.00%
Number of years of service to attain fifty percent vesting	10 years
Percentage vested per year after ten years of service	5.00%
Minimum age for unvested company contributions to fully vest	60 years
Compensation expense	$ 1.5	$ 1.5	$ 2.3
Long-term deferred compensation liability	43.2	36.7
Investment in Rabbi Trust	$ 37.7	$ 32.3

X

- Definition

The minimum age of a participant for unvested company contributions to fully vest.

+ References

No definition available.

+ Details

Name:	nus_MinimumAgeForUnvestedCompanyContributionsToFullyVest
Namespace Prefix:	nus_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of years of service with the company to attain fifty percent vesting.

+ References

No definition available.

+ Details

Name:	nus_NumberOfYearsOfServiceToAttainFiftyPercentVesting
Namespace Prefix:	nus_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum percentage of bonus pay that the participant is allowed to defer.

+ References

No definition available.

+ Details

Name:	nus_PercentageOfBonusDeferredMaximum
Namespace Prefix:	nus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represent the maximum percentage of deferred compensation.

+ References

No definition available.

+ Details

Name:	nus_PercentageOfCompensationDeferredMaximum
Namespace Prefix:	nus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represent percentage of matching contribution of participant salary.

+ References

No definition available.

+ Details

Name:	nus_PercentageOfMatchingContribution
Namespace Prefix:	nus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represent the percentage vested after ten full years of service.

+ References

No definition available.

+ Details

Name:	nus_PercentageVestedAfterTenYearsOfService
Namespace Prefix:	nus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represent the percentage vested per year after ten full years of service.

+ References

No definition available.

+ Details

Name:	nus_PercentageVestedPerYearAfterTenYearsOfService
Namespace Prefix:	nus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_AssetsHeldInTrust
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: