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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue from External Customer [Line Items]        
Net sales $ 1,306,200 $ 1,219,239 $ 2,568,849 $ 2,342,886
Weight Management [Member]
       
Revenue from External Customer [Line Items]        
Net sales 843,500 778,200 1,651,100 1,489,800
Targeted Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net sales 286,100 277,500 570,100 534,400
Energy, Sports and Fitness [Member]
       
Revenue from External Customer [Line Items]        
Net sales 68,900 65,100 135,600 123,400
Outer Nutrition [Member]
       
Revenue from External Customer [Line Items]        
Net sales 47,000 37,800 86,700 76,000
Literature, promotional and other [Member]
       
Revenue from External Customer [Line Items]        
Net sales $ 60,700 $ 60,600 $ 125,300 $ 119,300