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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2016 | Jul. 04, 2015 | Jul. 02, 2016 | Jul. 04, 2015
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |
Income before income taxes | $ 44,515 | $ 46,476 | $ 28,111 | $ 37,617
Net income attributable to Weight Watchers International, Inc. | $ 30,494 | 27,877 | $ 19,741 | $ 22,444
Adjustments |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |
Income before income taxes |  | 1,650 |  |
Net income attributable to Weight Watchers International, Inc. |  | $ 420 |  |

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