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Summary of Significant Accounting Policies (Details) | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Mar. 31, 2014 Venezuela Mechanism | Dec. 31, 2013 Venezuela USD ($) | Dec. 31, 2012 Venezuela | Dec. 31, 2011 Venezuela | Dec. 31, 2014 Venezuela USD ($) | Jun. 30, 2014 Venezuela SICAD I [Member] VEB | Mar. 31, 2014 Venezuela SICAD I [Member] VEB | Mar. 31, 2015 Venezuela SIMADI [Member] VEB | Mar. 31, 2014 Other Income (Expense), Net [Member] Venezuela USD ($) | Dec. 31, 2014 Other Income (Expense), Net [Member] Venezuela USD ($) | Dec. 31, 2014 Correct Certain Accounting Errors for Hyper-Inflationary Adjustments with Respect to Operations in Venezuela [Member] USD ($) | Dec. 31, 2014 Minimum [Member] Correct Certain Accounting Errors for Hyper-Inflationary Adjustments with Respect to Operations in Venezuela [Member] | Dec. 31, 2014 Building [Member] Minimum [Member] | Dec. 31, 2014 Building [Member] Maximum [Member] | Dec. 31, 2014 Furniture and Fixtures [Member] Minimum [Member] | Dec. 31, 2014 Furniture and Fixtures [Member] Maximum [Member] | Dec. 31, 2014 Computer Equipment [Member] Minimum [Member] | Dec. 31, 2014 Computer Equipment [Member] Maximum [Member] | Dec. 31, 2014 Leasehold Improvements [Member] | Dec. 31, 2014 Scanners [Member] | Dec. 31, 2014 Vehicles [Member] Minimum [Member] | Dec. 31, 2014 Vehicles [Member] Maximum [Member]
Inventories [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-down of estimated surplus intentory | $ 50,000,000 us-gaap_InventoryWriteDown |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Raw materials | 101,479,000 us-gaap_InventoryRawMaterials | 117,982,000 us-gaap_InventoryRawMaterials |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finished goods | 237,012,000 us-gaap_InventoryFinishedGoods | 221,687,000 us-gaap_InventoryFinishedGoods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 338,491,000 us-gaap_InventoryNet | 339,669,000 us-gaap_InventoryNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, adjustments to inventory carrying value | 5,900,000 us-gaap_ValuationAllowancesAndReservesBalance | 5,500,000 us-gaap_ValuationAllowancesAndReservesBalance | 7,100,000 us-gaap_ValuationAllowancesAndReservesBalance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions | 77,400,000 us-gaap_ValuationAllowancesAndReservesAdjustments | 12,300,000 us-gaap_ValuationAllowancesAndReservesAdjustments | 11,600,000 us-gaap_ValuationAllowancesAndReservesAdjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-offs | (27,300,000)us-gaap_ValuationAllowancesAndReservesDeductions | (11,900,000)us-gaap_ValuationAllowancesAndReservesDeductions | (13,200,000)us-gaap_ValuationAllowancesAndReservesDeductions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, adjustments to inventory carrying value | 56,000,000 us-gaap_ValuationAllowancesAndReservesBalance | 5,900,000 us-gaap_ValuationAllowancesAndReservesBalance | 5,500,000 us-gaap_ValuationAllowancesAndReservesBalance | 7,100,000 us-gaap_ValuationAllowancesAndReservesBalance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Shorter of estimated useful life or lease term |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years | 39 years | 5 years | 7 years | 3 years | 5 years |  | 3 years | 3 years | 5 years
Revenue recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued reserve for product returns | 10,100,000 us-gaap_RevenueRecognitionSalesReturnsReserveForSalesReturns | 11,000,000 us-gaap_RevenueRecognitionSalesReturnsReserveForSalesReturns |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales returns | 83,600,000 us-gaap_SalesReturnsGoods | 79,400,000 us-gaap_SalesReturnsGoods | 56,100,000 us-gaap_SalesReturnsGoods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustment related to foreign currency adjustment | 52,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 47,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 54,700,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nus_CorrectCertainAccountingErrorsForHyperInflationaryAdjustmentsWithRespectToOperationsInVenezuelaMember |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustment related to foreign currency adjustment, tax | 10,800,000 nus_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | 10,400,000 nus_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | 12,200,000 nus_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classification of Venezuela as a Highly Inflationary Economy and Devaluation of Its Currency [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,614,434,000 us-gaap_Assets | 1,821,062,000 us-gaap_Assets |  |  |  | 38,800,000 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_VE |  |  | 14,600,000 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monetary assets | 288,415,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 525,153,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 320,025,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 272,974,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 34,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementGeographicalAxis = country_VE |  |  | 8,200,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable to parent company |  |  |  |  |  | 37,900,000 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementGeographicalAxis = country_VE |  |  | 34,800,000 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from subsidiary (in hundredths) |  |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_StatementGeographicalAxis = country_VE | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_StatementGeographicalAxis = country_VE | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative inflation rate (n hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%nus_CumulativeInflationRate / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nus_CorrectCertainAccountingErrorsForHyperInflationaryAdjustmentsWithRespectToOperationsInVenezuelaMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |
Period used to determine highly inflationary economy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Adjustment to accumulated other comprehensive income (equity) | 52,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 47,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 54,700,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nus_CorrectCertainAccountingErrorsForHyperInflationaryAdjustmentsWithRespectToOperationsInVenezuelaMember |  |  |  |  |  |  |  |  |  |  |
Out-of-period adjustment to income statement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nus_CorrectCertainAccountingErrorsForHyperInflationaryAdjustmentsWithRespectToOperationsInVenezuelaMember |  |  |  |  |  |  |  |  |  |  |
Number of foreign exchange mechanisms |  |  |  |  | 2 nus_NumberOfForeignExchangeMechanisms / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange rate |  |  |  |  |  |  |  |  |  | 50 nus_ForeignCurrencyExchangeRateForTranslation / nus_ForeignCurrencyExchangeMechanismAxis = nus_SicadIMember / us-gaap_StatementGeographicalAxis = country_VE | 10.7 nus_ForeignCurrencyExchangeRateForTranslation / nus_ForeignCurrencyExchangeMechanismAxis = nus_SicadIMember / us-gaap_StatementGeographicalAxis = country_VE | 170 nus_ForeignCurrencyExchangeRateForTranslation / nus_ForeignCurrencyExchangeMechanismAxis = nus_SIMADIMember / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Translation of monetary assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 14,700,000 us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting / us-gaap_IncomeStatementLocationAxis = us-gaap_NonoperatingIncomeExpenseMember / us-gaap_StatementGeographicalAxis = country_VE | 25,300,000 us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting / us-gaap_IncomeStatementLocationAxis = us-gaap_NonoperatingIncomeExpenseMember / us-gaap_StatementGeographicalAxis = country_VE |  |  |  |  |  |  |  |  |  |  |  |
Fair value of financial instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value | 252,800,000 us-gaap_LongTermDebtFairValue | 188,300,000 us-gaap_LongTermDebtFairValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense incurred | 19,600,000 us-gaap_AdvertisingExpense | 11,300,000 us-gaap_AdvertisingExpense | 5,100,000 us-gaap_AdvertisingExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expense | 18,900,000 us-gaap_ResearchAndDevelopmentExpense | 18,000,000 us-gaap_ResearchAndDevelopmentExpense | 14,900,000 us-gaap_ResearchAndDevelopmentExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets and liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred tax assets | 39,951,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 64,677,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain Tax Positions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross balance at beginning of year | 7,484,000 us-gaap_UnrecognizedTaxBenefits | 9,045,000 us-gaap_UnrecognizedTaxBenefits | 7,387,000 us-gaap_UnrecognizedTaxBenefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decreases related to prior year tax positions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increases related to current year tax positions | 2,700,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 1,188,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 2,430,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (1,671,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decreases due to lapse of statutes of limitations | (4,106,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (1,086,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (854,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency adjustments | (91,000)nus_UnrecognizedTaxBenefitsCurrencyAdjustments | 8,000 nus_UnrecognizedTaxBenefitsCurrencyAdjustments | 82,000 nus_UnrecognizedTaxBenefitsCurrencyAdjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross balance at end of year | 5,987,000 us-gaap_UnrecognizedTaxBenefits | 7,484,000 us-gaap_UnrecognizedTaxBenefits | 9,045,000 us-gaap_UnrecognizedTaxBenefits | 7,387,000 us-gaap_UnrecognizedTaxBenefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | 1,100,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,100,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of change in gross unrecognized tax benefits, net of foreign adjustments, minimum | 1,000,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of change in gross unrecognized tax benefits, net of foreign currency adjustments, maximum | 2,000,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and penalties expenses/(benefits) | 400,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (100,000)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 300,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest and penalties related to uncertain tax positions | 1,300,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 900,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 1,100,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation expense related to equity compensation plans | 17,500,000 us-gaap_AllocatedShareBasedCompensationExpense | 32,600,000 us-gaap_AllocatedShareBasedCompensationExpense | 21,400,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustment related to foreign currency adjustment | 52,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 47,600,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 54,700,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nus_CorrectCertainAccountingErrorsForHyperInflationaryAdjustmentsWithRespectToOperationsInVenezuelaMember |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  | $ 1,400,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax | $ (10,500,000)us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax | $ 7,300,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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