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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012
Acquisitions [Abstract] |  |  |  |
Cost of acquired entity | $ 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 12,562 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
NOX Technologies, Inc. [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Cost of acquired entity |  |  |  | $ 12,562 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = nus_NOXTechnologiesIncMember
NOX Technologies, Inc. [Member] | Patents [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Estimated remaining lives |  |  |  | 8 years

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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