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Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail) (USD $)
In Millions, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Revenue from External Customer [Line Items] |
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| Net sales |
$ 1,133.6us-gaap_SalesRevenueNet
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$ 1,256.2us-gaap_SalesRevenueNet
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$ 1,306.2us-gaap_SalesRevenueNet
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$ 1,262.6us-gaap_SalesRevenueNet
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$ 1,268.9us-gaap_SalesRevenueNet
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$ 1,213.5us-gaap_SalesRevenueNet
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$ 1,219.2us-gaap_SalesRevenueNet
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$ 1,123.7us-gaap_SalesRevenueNet
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$ 4,958.6us-gaap_SalesRevenueNet
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$ 4,825.3us-gaap_SalesRevenueNet
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$ 4,072.3us-gaap_SalesRevenueNet
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| Weight Management [Member] |
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| Revenue from External Customer [Line Items] |
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| Net sales |
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3,177.0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
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3,063.7us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
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2,554.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_WeightManagementMember
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| Targeted Nutrition [Member] |
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| Revenue from External Customer [Line Items] |
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| Net sales |
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1,108.5us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
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1,109.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
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944.8us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_TargetedNutritionMember
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| Energy, Sports & Fitness [Member] |
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| Revenue from External Customer [Line Items] |
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| Net sales |
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260.6us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
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254.5us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
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209.4us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_EnergySportsAndFitnessMember
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| Outer Nutrition [Member] |
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| Revenue from External Customer [Line Items] |
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| Net sales |
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178.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
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157.2us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
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146.3us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_OuterNutritionMember
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| Literature, Promotional and Other [Member] |
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| Revenue from External Customer [Line Items] |
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| Net sales |
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$ 233.6us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember
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$ 240.0us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember
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$ 216.9us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= hlf_LiteraturePromotionalAndOtherMember
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