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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Oct. 01, 2016 | Oct. 03, 2015
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |
Income before income taxes | $ 38,609 | $ 32,553 |  | $ 66,721 | $ 70,170
Net income attributable to Weight Watchers International, Inc. | 34,658 | 21,790 |  | 54,400 | 44,234
Provision for income taxes | 3,989 | $ 10,761 |  | $ 12,420 | $ 26,082
Adjustments |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |
Income before income taxes |  |  | $ 1,650 |  |
Net income attributable to Weight Watchers International, Inc. | (2,684) |  | $ 420 |  |
Provision for income taxes | $ 2,684 |  |  |  |

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