Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Detail)

v3.10.0.1
Contingencies - Additional Information (Detail)
 9 Months Ended
Aug. 23, 2018
Plaintiff
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 31, 2017
USD ($)
Dec. 29, 2016
USD ($)
Jul. 31, 2016
USD ($)
Jan. 31, 2016
USD ($)
May 10, 2013
USD ($)
May 07, 2010
USD ($)
Sep. 30, 2009
USD ($)
Loss Contingencies [Line Items]                    
Other assets   $ 222,400,000 $ 250,300,000              
Prepaid expenses and other current assets   199,100,000 $ 147,000,000              
Deductible for product liability insurance   12,500,000                
Putative Class Plaintiffs [Member]                    
Loss Contingencies [Line Items]                    
Number of plaintiffs | Plaintiff 4                  
Pending Litigation due to Plaintiffs Arbitration [Member]                    
Loss Contingencies [Line Items]                    
Number of plaintiffs | Plaintiff 4                  
Herbalife International of America, Inc., [Member] | U.S. Federal Trade Commission [Member]                    
Loss Contingencies [Line Items]                    
Settlement amount paid for consent order   $ 200,000,000                
Third-party monitoring by independent compliance auditor, period   7 years                
Federal Revenue Office of Brazil [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service             $ 4,400,000     $ 1,800,000
Mexican Tax Administration Service [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service               $ 15,700,000 $ 61,300,000  
Surety bond through insurance company to guarantee payment of tax assessment   $ 19,300,000                
Other assets current and non current   35,700,000                
Other assets   26,400,000                
Prepaid expenses and other current assets   9,300,000                
Loss related to other assets   0                
Brazilian ICMS [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service   6,000,000                
Surety bond through insurance company to guarantee payment of tax assessment   10,800,000                
Other assets current and non current   7,700,000                
Other assets   2,100,000                
Prepaid expenses and other current assets   5,600,000                
Brazilian ICMS [Member] | State of Sao Paulo [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service       $ 14,700,000   $ 39,700,000        
Brazilian ICMS [Member] | State of Rio de Janeiro [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service   8,700,000                
Indian VAT Authorities [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service   8,700,000                
South Korean Customs Authority [Member] | Other Noncurrent Assets [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service   $ 32,000,000                
Greek Social Security Agency [Member]                    
Loss Contingencies [Line Items]                    
Assessment amount from tax administration service         $ 2,300,000