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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 | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | $ 1,059,300 | $ 1,016,900 | $ 1,031,900 | $ 964,200 | $ 884,500 | $ 895,200 | $ 879,700 | $ 795,100 | $ 4,072,330 | $ 3,454,537 | $ 2,734,226 |
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Weight Management [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | 2,554,900 | 2,158,700 | 1,698,900 | ||||||||
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Targeted Nutrition [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | 944,800 | 789,600 | 629,200 | ||||||||
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Energy, Sports and Fitness [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | 209,400 | 169,800 | 121,300 | ||||||||
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Outer Nutrition [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | 146,300 | 147,800 | 127,500 | ||||||||
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Literature, promotional and other [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net sales | $ 216,900 | $ 188,600 | $ 157,300 | ||||||||