Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue from External Customer [Line Items]        
Net Sales $ 1,213,543 $ 1,016,887 $ 3,556,429 $ 3,013,010
Operating Segments [Member] | Weight Management [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 772,900 635,900 2,262,700 1,884,500
Operating Segments [Member] | Targeted Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 280,700 237,400 815,100 703,300
Operating Segments [Member] | Energy, Sports and Fitness [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 65,500 54,800 188,900 155,400
Operating Segments [Member] | Outer Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 36,400 34,200 112,400 108,600
Operating Segments [Member] | Literature, promotional and other [Member]
       
Revenue from External Customer [Line Items]        
Net Sales $ 58,000 $ 54,600 $ 177,300 $ 161,200