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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 item | Dec. 31, 2014
Value-added tax assessments and other civil litigation |  |
Commitments and contingencies |  |
Minimum number of claims that the Company's insurance coverage may not be sufficient to cover | 1 natr_MinimumNumberOfClaimsCompaniesInsuranceCoverageMayNotCover / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_ValueAddedTaxAssessmentsAndOtherCivilLitigationMember |
Provision for losses | $ 0 us-gaap_LossContingencyLossInPeriod / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_ValueAddedTaxAssessmentsAndOtherCivilLitigationMember |
Future payments related to value-added tax assessments and other civil litigation, minimum | 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_ValueAddedTaxAssessmentsAndOtherCivilLitigationMember |
Future payments related to value-added tax assessments and other civil litigation, maximum | 500 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_ValueAddedTaxAssessmentsAndOtherCivilLitigationMember |
Non-income Tax Contingencies |  |
Commitments and contingencies |  |
Accrued liabilities | $ 2,228 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_NonIncomeTaxMember | $ 2,760 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = natr_NonIncomeTaxMember

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- Definition Represents the minimum number of claims the Company's insurance coverage may not be sufficient to cover. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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