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Inventories - Finished Goods Available for Resale (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|
| Inventory By Segment [Line Items] | ||
| Total | $ 339,411 | $ 247,696 |
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Weight Management, Targeted Nutrition and Energy, Sports and Fitness [Member]
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| Inventory By Segment [Line Items] | ||
| Total | 303,800 | 223,500 |
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Outer Nutrition [Member]
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| Inventory By Segment [Line Items] | ||
| Total | 17,500 | 11,100 |
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Literature, Promotional and Other [Member]
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| Inventory By Segment [Line Items] | ||
| Total | $ 18,100 | $ 13,100 |