RETIREMENT PLANS (Details 2)	12 Months Ended
Dec. 31, 2013
Minimum
Non-qualified Deferred Compensation Plan
Employee's contribution (as a percent)	2.00%
Maximum
Non-qualified Deferred Compensation Plan
Employee's contribution (as a percent)	100.00%

Represents the percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a non-qualified deferred compensation plan.

No definition available.

Name:	gnc_DeferredCompensationArrangementAnnualContributionPerEmployeePercent
Namespace Prefix:	gnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration