Basis of Presentation - Net Property, Plant and Equipment (Parenthetical) (Detail) $ in Millions	Dec. 31, 2014 USD ($)
Property, plant and equipment — at cost:
Property, plant and equipment understated value	$ 90

Property, plant and equipment at cost and accumulated depreciation understated value.

No definition available.

Name:	hlf_PropertyPlantAndEquipmentAtCostAndAccumulatedDepreciationUnderstatedValue
Namespace Prefix:	hlf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant