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
Mar. 31, 2013
Mar. 31, 2012
Revenue from External Customer [Line Items]    
Net sales $ 1,123,647 $ 964,175
Weight Management [Member]
   
Revenue from External Customer [Line Items]    
Net sales 711,600 601,800
Targeted Nutrition [Member]
   
Revenue from External Customer [Line Items]    
Net sales 256,900 224,900
Energy, Sports and Fitness [Member]
   
Revenue from External Customer [Line Items]    
Net sales 58,300 48,100
Outer Nutrition [Member]
   
Revenue from External Customer [Line Items]    
Net sales 38,200 36,700
Literature, promotional and other [Member]
   
Revenue from External Customer [Line Items]    
Net sales $ 58,600 [1] $ 52,700 [1]
[1] Product buybacks and returns in all product categories are included in the literature, promotional and other category.