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CAPITAL TRANSACTIONS (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Sep. 19, 2014 | Aug. 29, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2015
Stock options |  |  |  |  |  |
Number of shares |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  | 1,926,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,784,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,374,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Granted (in shares) |  |  | 258,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 832,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 686,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Forfeited or canceled (in shares) |  |  | (23,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (184,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (35,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Exercised (in shares) |  |  | (124,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (506,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (241,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options outstanding at the end of the period (in shares) |  |  | 2,037,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,926,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,784,000us-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) |  |  | $ 12.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 11.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 9.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Granted (in dollars per share) |  |  | $ 15.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 15.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 15.11us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Forfeited or canceled (in dollars per share) |  |  | $ 13.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 13.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 13.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Exercised (in dollars per share) |  |  | $ 6.42us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 8.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 9.95us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Options outstanding at the end of the period (in dollars per share) |  |  | $ 11.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 12.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 11.81us-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) | $ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.50natr_SpecialOneTimeCommonStockDividendsPerShareCashPaid / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Decrease in exercise price of all outstanding stock options (in dollars per share) |  |  | $ 1.50natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIncreaseDecreaseInExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1.50natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIncreaseDecreaseInExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Aggregate intrinsic values of options exercised |  |  | $ 1,093us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 4,576us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 1,427us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 6.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 6.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 7.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Share-based compensation, related information |  |  |  |  |  |
Share-based compensation expense |  |  | 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Related tax benefit |  |  | 307us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 653us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 378us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Stock options | Maximum |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |
Expected life |  |  | 6 years | 6 years | 6 years |
Risk-free interest rate (as a percent) |  |  | 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Expected volatility (as a percent) |  |  | 56.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 58.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 66.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Dividend yield (as a percent) |  |  | 2.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 2.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Stock options | Minimum |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |
Expected life |  |  |  | 5 years | 4 years |
Risk-free interest rate (as a percent) |  |  |  | 0.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Expected volatility (as a percent) |  |  |  | 55.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 58.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Dividend yield (as a percent) |  |  |  | 2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Time-based stock options |  |  |  |  |  |
Share-based compensation, related information |  |  |  |  |  |
Share-based compensation expense |  |  | 2,932us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 3,166us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 2,101us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
Related tax benefit |  |  | 1,158us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 1,251us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 850us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
Unrecognized share-based compensation expense |  |  | 2,018us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 3,294us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember | 2,715us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember |
Weighted-average period over which the remaining compensation cost is expected to be recognized |  |  | 1 year 9 months 18 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 |  |  |
Share-based compensation, related information |  |  |  |  |  |
Share-based compensation expense |  |  | 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember | 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember | 653us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
Related tax benefit |  |  | 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember | 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember | 255us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
Unrecognized share-based compensation expense |  |  |  |  | $ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember |
Performance based stock options sales and operating income margins |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Operating income margin, two (as a percent) |  |  | 8.00%natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo / us-gaap_AwardTypeAxis = natr_PerformanceBasedStockOptionsVestingUponAchievingSalesAndOperatingIncomeMarginsMember |  |  |
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 |  |  |
2012 Stock Incentive Plan |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Number of shares authorized under the plan |  |  | 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |  |
2012 Stock Incentive Plan | Subsequent event |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Additional number of shares authorized under the plan |  |  |  |  |  | 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
2012 Stock Incentive Plan | Stock options |  |  |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  |  |  | 832,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member | 469,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
Weighted Average Exercise Price Per Share |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 15.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member | $ 14.86us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
Share-based compensation, additional disclosures |  |  |  |  |  |
Expiration period |  |  |  | 10 years | 10 years |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  | $ 6.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member | $ 7.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |
2012 Stock Incentive Plan | Time-based stock options |  |  |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  |  | 258us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 15.38us-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) |  |  | $ 6.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2012Member |  |  |
2009 Incentive Plan |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Number of shares authorized under the plan |  |  | 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member |  |  |
2009 Incentive Plan | Time-based stock options |  |  |  |  |  |
Number of shares |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 217,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member |
Weighted Average Exercise Price Per Share |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 15.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member |
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) |  |  |  |  | $ 7.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = natr_TimeBasedStockOptionsMember / us-gaap_PlanNameAxis = natr_IncentivePlan2009Member |

X
- Definition Represents the period of time during which operating income margins must be achieved in order to vest in performance based stock options. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the consecutive period of time used to assess operating income margins which determine vesting. + References No definition available. + Details
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X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of a performance condition pertaining to achievement of annual net sales targets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the first operating margin percentage to be achieved for the vesting of stock options. + References No definition available. + Details
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Namespace Prefix: | natr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the three operating margin percentage to be achieved for the vesting of stock options. + References No definition available. + Details
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Namespace Prefix: | natr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the second operating margin percentage to be achieved for the vesting of stock options. + References No definition available. + Details
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Namespace Prefix: | natr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase (decrease) in the exercise price of the stock options outstanding under the plan. + References No definition available. + Details
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Namespace Prefix: | natr_
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Balance Type: | na
Period Type: | duration

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- Details
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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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -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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