Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Reclassified from Accumulated Other Comprehensive Loss into Income Effective Portion (Detail)

v2.4.1.9
Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Reclassified from Accumulated Other Comprehensive Loss into Income Effective Portion (Detail) (Foreign exchange currency contracts relating to inventory hedges [Member], Derivatives designated as hedging instruments [Member], Cost of sales [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Foreign exchange currency contracts relating to inventory hedges [Member] | Derivatives designated as hedging instruments [Member] | Cost of sales [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income $ 1.4us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hlf_ForeignExchangeCurrencyContractsRelatingToInventoryHedgesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember 		$ 0.3us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hlf_ForeignExchangeCurrencyContractsRelatingToInventoryHedgesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember