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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue from External Customer [Line Items]        
Net Sales $ 1,256,164 $ 1,213,543 $ 3,825,013 $ 3,556,429
Weight Management [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 805,100 772,900 2,456,200 2,262,700
Targeted Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 281,800 280,700 851,900 815,100
Energy, Sports and Fitness [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 67,100 65,500 202,700 188,900
Outer Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net Sales 43,300 36,400 130,000 112,400
Literature, promotional and other [Member]
       
Revenue from External Customer [Line Items]        
Net Sales $ 58,900 $ 58,000 $ 184,200 $ 177,300