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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail) - shares shares in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Market condition awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 0.1 | 0.1
Performance condition SARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding SARs | 3.3 | 2.9
Exercisable SARs | 1.1 |

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- Definition The number of exercisable stock appreciation rights (SARs). + References No definition available. + Details
Name: | hlf_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockAppreciationRightsExercisableNumber
Namespace Prefix: | hlf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of outstanding stock appreciation rights (SARs). + References No definition available. + Details
Name: | hlf_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockAppreciationRightsOutstandingNumber
Namespace Prefix: | hlf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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

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- Details
Name: | us-gaap_AwardTypeAxis=hlf_MarketConditionAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=hlf_PerformanceConditionAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |