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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income from continuing operations before provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |
Domestic |  |  |  |  |  |  |  |  | $ 4,577us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 6,111us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 17,625us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign |  |  |  |  |  |  |  |  | 14,437us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 19,465us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 17,814us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations before provision for income taxes | 1,183us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,504us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,748us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,579us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,589us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,296us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,323us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,368us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 19,014us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 25,576us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,439us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (2,713)us-gaap_CurrentFederalTaxExpenseBenefit | (773)us-gaap_CurrentFederalTaxExpenseBenefit | 1,901us-gaap_CurrentFederalTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 514us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 399us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 248us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 5,539us-gaap_CurrentForeignTaxExpenseBenefit | 7,230us-gaap_CurrentForeignTaxExpenseBenefit | 4,714us-gaap_CurrentForeignTaxExpenseBenefit
Subtotal |  |  |  |  |  |  |  |  | 3,340us-gaap_CurrentIncomeTaxExpenseBenefit | 6,856us-gaap_CurrentIncomeTaxExpenseBenefit | 6,863us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (3,804)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,654us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,303us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | (326)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 186us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,207us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 47us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (773)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 158us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Subtotal |  |  |  |  |  |  |  |  | (4,083)us-gaap_DeferredIncomeTaxExpenseBenefit | 1,067us-gaap_DeferredIncomeTaxExpenseBenefit | 3,668us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision (benefit) for income taxes | $ 309us-gaap_IncomeTaxExpenseBenefit | $ 407us-gaap_IncomeTaxExpenseBenefit | $ 2,198us-gaap_IncomeTaxExpenseBenefit | $ (3,657)us-gaap_IncomeTaxExpenseBenefit | $ 776us-gaap_IncomeTaxExpenseBenefit | $ 1,610us-gaap_IncomeTaxExpenseBenefit | $ 3,235us-gaap_IncomeTaxExpenseBenefit | $ 2,302us-gaap_IncomeTaxExpenseBenefit | $ (743)us-gaap_IncomeTaxExpenseBenefit | $ 7,923us-gaap_IncomeTaxExpenseBenefit | $ 10,531us-gaap_IncomeTaxExpenseBenefit
Differences between the statutory U.S. federal income tax rate and the provision for income taxes from continuing operations, as a percentage of income before provision for income taxes |  |  |  |  |  |  |  |  |  |  |
Statutory U.S. federal income tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision for state income taxes (as a percent) |  |  |  |  |  |  |  |  | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
U.S. tax impact of foreign operations (as a percent) |  |  |  |  |  |  |  |  | (73.00%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | (16.20%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Valuation allowance change (as a percent) |  |  |  |  |  |  |  |  | 48.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 4.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (6.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Unrecognized tax benefits (as a percent) |  |  |  |  |  |  |  |  | (8.60%)natr_EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits | 7.90%natr_EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits | 2.90%natr_EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits
Domestic manufacturing deduction (as a percent) |  |  |  |  |  |  |  |  | (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Nondeductible foreign expenses (as a percent) |  |  |  |  |  |  |  |  | (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Other (as a percent) |  |  |  |  |  |  |  |  | (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (as a percent) |  |  |  |  |  |  |  |  | (3.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | 31.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 29.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Components of U.S. tax impact of foreign operations |  |  |  |  |  |  |  |  |  |  |
Dividends received from foreign subsidiaries (as a percent) |  |  |  |  |  |  |  |  | 59.50%natr_EffectiveIncomeTaxRateReconciliationDividendsReceivedFromForeignSubsidiaries | 29.40%natr_EffectiveIncomeTaxRateReconciliationDividendsReceivedFromForeignSubsidiaries | 4.50%natr_EffectiveIncomeTaxRateReconciliationDividendsReceivedFromForeignSubsidiaries
Foreign tax credits (as a percent) |  |  |  |  |  |  |  |  | (121.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign | (34.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign | (4.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Foreign tax rate differential (as a percent) |  |  |  |  |  |  |  |  | (11.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (10.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Unremitted earnings (as a percent) |  |  |  |  |  |  |  |  | (0.20%)natr_EffectiveIncomeTaxRateReconciliationChangesInDeferredTaxLiabilitiesOnForeignEarnings | (0.50%)natr_EffectiveIncomeTaxRateReconciliationChangesInDeferredTaxLiabilitiesOnForeignEarnings | (0.30%)natr_EffectiveIncomeTaxRateReconciliationChangesInDeferredTaxLiabilitiesOnForeignEarnings
Total (as a percent) |  |  |  |  |  |  |  |  | (73.00%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | (16.20%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings | (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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