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Capital Transactions (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 19, 2013 | Aug. 29, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Stock options |  |  |  |  |
Number of shares |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  | 2,037 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Granted (in shares) |  |  | 310 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Forfeited or canceled (in shares) |  |  | (49)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Exercised (in shares) |  |  | (227)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Options outstanding at the end of the period (in shares) |  |  | 2,071 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  |  | $ 11.69 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Granted (in dollars per share) |  |  | $ 14.27 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Forfeited or canceled (in dollars per share) |  |  | $ 15.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Exercised (in dollars per share) |  |  | $ 7.63 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Options outstanding at the end of the period (in dollars per share) |  |  | $ 12.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Share-based compensation, additional disclosures |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.50 natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Dividend yield (as a percent) |  |  | 2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Stock options | Minimum |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |
Expected life |  |  | 5 years |  |
Expected volatility (as a percent) |  |  | 46.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Stock options | Maximum |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |
Expected life |  |  | 6 years |  |
Expected volatility (as a percent) |  |  | 52.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Time-based stock options |  |  |  |  |
Share-based compensation, related information |  |  |  |  |
Share-based compensation expense |  |  | $ 580 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | $ 897 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
Related tax benefit |  |  | 229 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 354 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
Unrecognized share-based compensation expense |  |  | 2,589 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |  | 2,018 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember
Weighted-average period over which the remaining compensation cost is expected to be recognized |  |  | 1 year 10 months 24 days |  |
Time-based stock options | Maximum |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period |  |  | 48 months |  |
Performance based stock options operating income margins |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Operating income margin, one (as a percent) |  |  | 6.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsOne / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |  |
Operating income margin, two (as a percent) |  |  | 8.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |  |
Operating income margin, three (as a percent) |  |  | 10.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsThree / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |  |
Period of time during which operating income margins must be achieved in order to vest in performance based stock options |  |  | 12 months |  |
Consecutive period of time used to assess operating income margins which determine vesting |  |  | 15 months |  |
Performance based stock options sales and operating income margins |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period |  |  | 2 years |  |
Performance based stock options sales and operating income margins | Minimum |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Operating income margin, two (as a percent) |  |  | 8.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesAndOperatingIncomeMarginsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Performance based stock options sales |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period based on achieving annual net sales targets |  |  | 1 year |  |
Performance based stock options sales | Maximum |  |  |  |  |
Share-based compensation, related information |  |  |  |  |
Potential compensation expense |  |  | $ 800 natr_ShareBasedCompensationPotentialCompensationExpenseToBeRecognized / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
2012 Stock Incentive Plan |  |  |  |  |
Share Based Compensation |  |  |  |  |
Number of shares authorized under the plan |  |  |  |  | 1,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member
Additional number of shares authorized under the plan |  |  | 1,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |
2012 Stock Incentive Plan | Time-based stock options |  |  |  |  |
Number of shares |  |  |  |  |
Granted (in shares) |  |  | 310 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Granted (in dollars per share) |  |  | $ 14.27 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |
Share-based compensation, additional disclosures |  |  |  |  |
Expiration period |  |  | 10 years |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 4.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |
2009 Incentive Plan | Maximum |  |  |  |  |
Share Based Compensation |  |  |  |  |
Number of shares authorized under the plan |  |  | 400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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