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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Disclosure Basis Of Presentation Details [Line Items] |  |  |
Income before income taxes | $ 244,061 | $ 145,080 | $ 84,127
Net income attributable to Weight Watchers International, Inc. | 223,749 | 163,514 | 67,699
Provision for (benefit from) income taxes | $ 20,493 | $ (18,237) | 16,634
Adjustments |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |
Income before income taxes |  |  | 347
Net income attributable to Weight Watchers International, Inc. |  |  | 1,791
Provision for (benefit from) income taxes |  |  | $ 2,138

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