Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v2.4.1.9
Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Vietnam | Discontinued Operations.    
Classification of Venezuela and Belarus as a Highly Inflationary Economy and Devaluation of Its Currencies    
Net sales revenue as a percent of consolidated net sales revenue 0.30%natr_NetSalesRevenueAsPercentageOfConsolidatedNetSalesRevenue
/ us-gaap_StatementGeographicalAxis
= country_VN
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
0.40%natr_NetSalesRevenueAsPercentageOfConsolidatedNetSalesRevenue
/ us-gaap_StatementGeographicalAxis
= country_VN
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Belarusian subsidiary    
Classification of Venezuela and Belarus as a Highly Inflationary Economy and Devaluation of Its Currencies    
Gains or losses from a re-measurement of the financial statements using official exchange rates 0us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTaxPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= natr_BelarusianSubsidiariesMember
0us-gaap_TranslationAdjustmentFunctionalToReportingCurrencyNetOfTaxPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= natr_BelarusianSubsidiariesMember
Net sales revenue as a percent of consolidated net sales revenue 2.10%natr_NetSalesRevenueAsPercentageOfConsolidatedNetSalesRevenue
/ dei_LegalEntityAxis
= natr_BelarusianSubsidiariesMember
2.50%natr_NetSalesRevenueAsPercentageOfConsolidatedNetSalesRevenue
/ dei_LegalEntityAxis
= natr_BelarusianSubsidiariesMember