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Professional Fees and Other Expenses - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Selling, General and Administrative Expenses [Member] |  |  |
Professional Fees And Other Expenses [Line Items] |  |  |
Professional fees and other expenses | $ 12.1 | $ 18.7 | $ 25.1

X
- Definition Professional fees and other expenses incurred in response to allegations. + References No definition available. + Details
Name: | hlf_ProfessionalFeesAndOtherExpenses
Namespace Prefix: | hlf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Professional fees and other expenses. + References No definition available. + Details
Name: | hlf_ProfessionalFeesAndOtherExpensesLineItems
Namespace Prefix: | hlf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |