Annual report pursuant to Section 13 and 15(d)

Segment Information - Reconciliation of Revenue from Segments to Consolidated (Detail)

v2.4.1.9
Segment Information - Reconciliation of Revenue from Segments to Consolidated (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]                      
Total 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
United States [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Net Sales                 905.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
886.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
816.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
Mexico [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total 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 Korea [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Net Sales                 416.0us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_KR
433.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_KR
421.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_KR
Others [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Net Sales                 2,405.3us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_OtherCountriesMember
2,470.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_OtherCountriesMember
2,059.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_OtherCountriesMember
Primary Reporting Segment [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Net Sales                 4,294.3us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_PrimaryReportingSegmentMember
4,353.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_PrimaryReportingSegmentMember
3,793.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= hlf_PrimaryReportingSegmentMember
China [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total 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