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CAPITAL TRANSACTIONS (Details 4) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 19, 2014 USD ($) $ / shares | Aug. 29, 2013 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) installment $ / shares shares | Dec. 31, 2012 shares
Stock options |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 | $ 1.50 |  |  |  |
Outstanding options to purchase (in shares) | shares |  |  | 1,683,000 | 2,037,000 | 1,926,000 | 1,784,000
Exercisable (in shares) | shares |  |  | 958,000 | 1,069,000 |  |
Expected to vest (in shares) | shares |  |  | 588,000 | 794,000 |  |
Aggregate Intrinsic value, outstanding | $ |  |  | $ 900,000 | $ 6,800,000 |  |
Aggregate Intrinsic value, exercisable | $ |  |  | 900,000 | 4,900,000 |  |
Aggregate Intrinsic value, expected to vest | $ |  |  | $ 0 | $ 1,800,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Exercised (in dollars per share) |  |  | $ 9.78 | $ 6.42 | $ 8.56 |
Share-based compensation, additional disclosures |  |  |  |  |  |
Share-based compensation expense | $ | $ 0 | $ 0 |  |  |  |
Related tax benefits | $ |  |  | $ 500,000 | $ 300,000 | $ 700,000 |
RSUs |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 | $ 1.50 |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Finnerty Model discount for lack of marketability |  |  | 17.50% |  |  |
Share-based compensation expense | $ | $ 0 | $ 0 | $ 2,900,000 | 1,000,000 | $ 200,000 |
Unrecognized share-based compensation expense, options | $ |  |  | 2,500,000 | $ 800,000 |  |
Unrecognized share-based compensation expense, other than options | $ |  |  | $ 2,800,000 |  |  |
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  | 1 year 10 months 24 days |  |  |
Minimum statutory withholding requirements that the Company pays on behalf of its employees | shares |  |  | 8,000 |  |  |
SARs |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 | $ 1.50 |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 22,000 |  |  |
Unrecognized share-based compensation expense, options | $ |  |  | $ 32,000 |  |  |
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  | 1 year 9 months 18 days |  |  |
SARs | Minimum |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 12 months |  |  |
SARs | Maximum |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 48 months |  |  |
2012 Stock Incentive Plan | RSUs |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Units outstanding at the beginning of the period (in shares) | shares |  |  | 180,000 | 32,000 | 18,000 |
Granted (in shares) | shares |  |  | 679,000 | 156,000 | 17,000 |
Issued (in shares) | shares |  |  | (30,000) | 0 | (3,000) |
Forfeited or canceled (in shares) | shares |  |  | (85,000) | (8,000) | 0 |
Units outstanding at the end of the period (in shares) | shares |  |  | 744,000 | 180,000 | 32,000 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  | $ 15.09 | $ 12.47 | $ 12.07 |
Granted (in dollars per share) |  |  | 12.61 | 10.73 | 12.90 |
Issued (in dollars per share) |  |  | 13.63 | 0.00 | 12.07 |
Forfeited or canceled (in dollars per share) |  |  | 12.84 | 15.37 | 0.00 |
Units outstanding at the end of the period (in dollars per share) |  |  | $ 12.48 | $ 15.09 | $ 12.47 |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  |  | 4 years | 1 year |
Number of monthly installments for vesting of stock awards | installment |  |  |  |  | 12 |
2012 Stock Incentive Plan | RSUs | Minimum |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 12 months |  |  |
2012 Stock Incentive Plan | RSUs | Maximum |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 48 months |  |  |
2012 Stock Incentive Plan | RSUs | Board of Directors |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Number of shares subject to restriction period | shares |  |  | 60,000 | 32,000 |  |
Restriction period |  |  | 2 years |  |  |
2012 Stock Incentive Plan | Time-based RSUs |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 12.97 |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
2012 Stock Incentive Plan | Time-based RSUs | Cliff vesting |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
2012 Stock Incentive Plan | Performance-based RSUs |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 12.13 |  |  |
2012 Stock Incentive Plan | Performance-based RSUs | Net sales and operating income targets |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
2012 Stock Incentive Plan | Performance-based RSUs | Earnings per share targets |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Vesting period |  |  | 6 years |  |  |
2012 Stock Incentive Plan | SARs |  |  |  |  |  |
Number of Shares |  |  |  |  |  |
Units outstanding at the beginning of the period (in shares) | shares |  |  | 30,000 |  |  |
Granted (in shares) | shares |  |  | 0 | 30,000 |  |
Issued (in shares) | shares |  |  | 0 |  |  |
Forfeited or canceled (in shares) | shares |  |  | (10,000) |  |  |
Units outstanding at the end of the period (in shares) | shares |  |  | 20,000 | 30,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  | $ 5.47 |  |  |
Granted (in dollars per share) |  |  | 0.00 | $ 5.47 |  |
Issued (in dollars per share) |  |  | 0.00 |  |  |
Exercised (in dollars per share) |  |  |  | 13.86 |  |
Forfeited or canceled (in dollars per share) |  |  | 5.86 |  |  |
Units outstanding at the end of the period (in dollars per share) |  |  | $ 5.27 | $ 5.47 |  |
Share-based compensation, additional disclosures |  |  |  |  |  |
Termination period |  |  | 10 years |  |  |

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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_StockAppreciationRightsSARSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=natr_IncentivePlan2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=natr_TimeBasedRestrictedStockUnitsRSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=natr_CliffVestingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=natr_PerformanceBasedRestrictedStockUnitsRSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=natr_NetSalesandOperatingIncomeTargetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=natr_EarningsPerShareTargetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |