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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, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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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, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | $ 1,268,900 | $ 1,213,500 | $ 1,219,200 | $ 1,123,600 | $ 1,059,300 | $ 1,016,900 | $ 1,031,900 | $ 964,200 | $ 4,825,308 | $ 4,072,330 | $ 3,454,537 |
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Operating Segments [Member] | Weight Management [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | 3,063,700 | 2,554,900 | 2,158,700 | ||||||||
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Operating Segments [Member] | Targeted Nutrition [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | 1,109,900 | 944,800 | 789,600 | ||||||||
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Operating Segments [Member] | Energy, Sports and Fitness [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | 254,500 | 209,400 | 169,800 | ||||||||
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Operating Segments [Member] | Outer Nutrition [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | 157,200 | 146,300 | 147,800 | ||||||||
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Operating Segments [Member] | Literature, Promotional and Other [Member]
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| Revenue from External Customer [Line Items] | |||||||||||
| Net Sales | $ 240,000 | $ 216,900 | $ 188,600 | ||||||||