Annual report pursuant to Section 13 and 15(d)

Segment Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail)

v2.4.1.9
Segment Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 1,133.6us-gaap_SalesRevenueNet $ 1,256.2us-gaap_SalesRevenueNet $ 1,306.2us-gaap_SalesRevenueNet $ 1,262.6us-gaap_SalesRevenueNet $ 1,268.9us-gaap_SalesRevenueNet $ 1,213.5us-gaap_SalesRevenueNet $ 1,219.2us-gaap_SalesRevenueNet $ 1,123.7us-gaap_SalesRevenueNet $ 4,958.6us-gaap_SalesRevenueNet $ 4,825.3us-gaap_SalesRevenueNet $ 4,072.3us-gaap_SalesRevenueNet
North America [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 926.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
908.0us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
841.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Mexico [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 567.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_MX
562.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_MX
496.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_MX
South and Central America [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 826.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_SegmentGeographicalGroupOfCountriesGroupTwoMember
973.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_SegmentGeographicalGroupOfCountriesGroupTwoMember
688.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_SegmentGeographicalGroupOfCountriesGroupTwoMember
EMEA [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 843.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
735.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
627.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Asia Pacific [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 1,130.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
1,174.6us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
1,139.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
China [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 $ 664.3us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 471.6us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 278.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CN