Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v2.4.1.9
Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 11.1us-gaap_AllocatedShareBasedCompensationExpense $ 11.0us-gaap_AllocatedShareBasedCompensationExpense  
Unrecognized compensation cost on non-vested stock awards 80.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition 1 year 8 months 12 days    
Total intrinsic value of awards exercised for options and SARs 17.6hlf_IntrinsicValueOfAwardsExercisedForOptionsAndSars 14.8hlf_IntrinsicValueOfAwardsExercisedForOptionsAndSars  
Total vesting date fair value of stock units   8.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Unrealized excess tax benefits 24.2hlf_UnrealizedExcessTaxBenefits   23.6hlf_UnrealizedExcessTaxBenefits
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total vesting date fair value of stock units $ 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of SARs granted $ 12.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
$ 28.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember