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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 7) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 01, 2014 | Sep. 19, 2014 | Aug. 29, 2014 | Jun. 26, 2014 | Jun. 02, 2014 | Apr. 07, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 25, 2014
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of Dividends | $ 1,871us-gaap_PaymentsOfDividends | $ 28,501us-gaap_PaymentsOfDividends | $ 1,619us-gaap_PaymentsOfDividends |  | $ 1,619us-gaap_PaymentsOfDividends | $ 1,618us-gaap_PaymentsOfDividends | $ 35,228us-gaap_PaymentsOfDividends | $ 30,419us-gaap_PaymentsOfDividends | $ 2,349us-gaap_PaymentsOfDividends |
Premium to Entity Average Stock Price for the Trailing Thirty Day Period |  |  |  | 10.00%natr_PremiumToEntityAverageStockPriceForTrailingThirtyDayPeriod |  |  |  |  |  |
Fosun Pharma [Member] |  |  |  |  |  |  |  |  |  |
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Shares, Issued |  |  |  |  |  |  |  |  |  | 2,855us-gaap_SharesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember
Share Price |  |  |  |  |  |  |  |  |  | $ 16.19us-gaap_SharePrice / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember
Period of Time to Measure Premium of Entity Common Stock |  |  |  | 30 days |  |  |  |  |  |
Related Party Ownership Percentage After Common Stock Purchase |  |  |  |  |  |  |  |  |  | 15.00%natr_RelatedPartyOwnershipPercentageAfterCommonStockPurchase / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember
Common Stock |  |  |  |  |  |  |  |  |  |
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  |  |  | $ 1.50us-gaap_DividendsPayableAmountPerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Dividends payable to shareholders |  |  |  |  |  |  |  |  |  | 28,501natr_DividendsPayableToShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common Stock | Fosun Pharma [Member] |  |  |  |  |  |  |  |  |  |
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  |  |  |  | 44,795us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
China Joint Venture [Member] |  |  |  |  |  |  |  |  |  |
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  |  |  |  |  |  |  |  | 80.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = natr_ChinaJointVentureMember
Initial Capitalization Amount |  |  |  |  |  |  |  |  |  | 20,000natr_InitialCapitalizationAmount / dei_LegalEntityAxis = natr_ChinaJointVentureMember
China Joint Venture [Member] | Fosun Pharma [Member] |  |  |  |  |  |  |  |  |  |
Strategic Alliance and Formation of China Joint Venture [Line Items] |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  |  |  |  |  |  |  |  | 20.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = natr_ChinaJointVentureMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember
Initial Capitalization Amount |  |  |  |  |  |  |  |  |  | $ 16,000natr_InitialCapitalizationAmount / dei_LegalEntityAxis = natr_ChinaJointVentureMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember
Number of Board of Directors Initially Appointed |  |  |  |  |  |  |  |  |  | 1natr_NumberOfBoardOfDirectorsInitiallyAppointed / dei_LegalEntityAxis = natr_ChinaJointVentureMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = natr_FosunPharmaMember

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