Annual report pursuant to Section 13 and 15(d)

Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail)

v2.4.1.9
Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (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
Revenue from External Customer [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
Weight Management [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 3,177.0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
3,063.7us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
2,554.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
Targeted Nutrition [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 1,108.5us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
1,109.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
944.8us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
Energy, Sports & Fitness [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 260.6us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
254.5us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
209.4us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
Outer Nutrition [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 178.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
157.2us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
146.3us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
Literature, Promotional and Other [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 233.6us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember
$ 240.0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember
$ 216.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember