Represents the restriction period before shares will be issued related to a share-based compensation plan.

No definition available.

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Namespace Prefix:	natr_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	natr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the first operating margin percentage to be achieved for the vesting of stock options.

+ References

No definition available.

+ Details

Name:	natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsOne
Namespace Prefix:	natr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the three operating margin percentage to be achieved for the vesting of stock options.

+ References

No definition available.

+ Details

Name:	natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsThree
Namespace Prefix:	natr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the second operating margin percentage to be achieved for the vesting of stock options.

+ References

No definition available.

+ Details

Name:	natr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOperatingMarginsTwo
Namespace Prefix:	natr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=natr_TimeBasedStockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_AwardTypeAxis=natr_PerformanceBasedStockOptionsVestingUponAchievingOperatingIncomeMarginsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_PlanNameAxis=natr_A2012IncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 4)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Time-based stock options \| Maximum
Share Based Compensation
Vesting period	48 months
Performance based stock options operating income margins
Share Based Compensation
Operating income margin, one (as a percent)	6.00%
Operating income margin, two (as a percent)	8.00%
Operating income margin, three (as a percent)	10.00%
RSUs \| 2012 Stock Incentive Plan
Share Based Compensation
Vesting period	1 year	1 year	1 year
RSUs \| 2012 Stock Incentive Plan \| Board of Directors
Share Based Compensation
Vesting period based on achieving annual net sales targets	1 year
Restriction period	2 years
RSUs \| 2012 Stock Incentive Plan \| Minimum
Share Based Compensation
Vesting period	12 months
RSUs \| 2012 Stock Incentive Plan \| Maximum
Share Based Compensation
Vesting period	48 months