Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Parenthetical) (Detail)

v2.4.1.9
Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
United States [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Increase (decrease) in contribution margin due to misclassification   $ 8.3hlf_IncreaseDecreaseInContributionMargin
/ us-gaap_StatementGeographicalAxis
= country_US
Increase (decrease) in net sales due to misclassification   3.3hlf_IncreaseDecreaseInSales
/ us-gaap_StatementGeographicalAxis
= country_US
Others [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Increase (decrease) in contribution margin due to misclassification   (8.3)hlf_IncreaseDecreaseInContributionMargin
/ us-gaap_StatementGeographicalAxis
= hlf_OtherCountriesMember
Increase (decrease) in net sales due to misclassification   (3.3)hlf_IncreaseDecreaseInSales
/ us-gaap_StatementGeographicalAxis
= hlf_OtherCountriesMember
China [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Independent service providers service fees costs $ 78.7hlf_ForeignSalespersonCompensationAndServiceFeeCosts
/ us-gaap_StatementGeographicalAxis
= country_CN 		$ 61.6hlf_ForeignSalespersonCompensationAndServiceFeeCosts
/ us-gaap_StatementGeographicalAxis
= country_CN