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EMPLOYEE BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
401(k) plans |  |  |
Employer's matching contribution (as a percent) | 60.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Maximum contribution by employer as a percentage of employee's compensation | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Employer's matching contribution before change (as a percent) | 50.00%natr_DefinedContributionPlanEmployerMatchingContributionPercentBeforeChange |  |
Vesting period of employer's contributions | 3 years |  |
Contributions by employer | $ 838us-gaap_DefinedContributionPlanCostRecognized | $ 832us-gaap_DefinedContributionPlanCostRecognized | $ 551us-gaap_DefinedContributionPlanCostRecognized
Nonqualified deferred compensation plan |  |  |
Maximum percentage of annual salary and bonus that may be deferred | 100.00%natr_DeferredCompensationArrangementsMaximumPercentageOfSalaryAndBonusThatMayBeDeferred |  |
Period for payment of obligation upon separation, one | 3 years |  |
Period for payment of obligation upon separation, two | 5 years |  |
Deferred compensation plan assets | $ 1,038us-gaap_DeferredCompensationPlanAssets | $ 971us-gaap_DeferredCompensationPlanAssets |

X
- Definition Represents the maximum percentage of salary and bonus that may be deferred by participating employees under the deferred compensation plan. + References No definition available. + Details
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Period Type: | duration

X
- Definition Represents the period one for the payment of obligation upon separation of employment of the participant under the deferred compensation plan. + References No definition available. + Details
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X
- Definition Represents the period two for the payment of obligation upon separation of employment of the participant under the deferred compensation plan. + References No definition available. + Details
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X
- Definition Represents the period after which employer's contribution vest under the defined contribution plan. + References No definition available. + Details
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X
- Definition Percentage of matching contributions made by employer to a defined contribution plan before change. + References No definition available. + Details
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Namespace Prefix: | natr_
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Balance Type: | na
Period Type: | duration

X
- Details
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Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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