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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Disclosure Basis of Presentation Details [Line Items]
Net income attributable to Weight Watchers International, Inc.	$ 44,719	$ 34,658	$ 100,544	$ 54,400
Provision for income taxes	$ 19,593	3,989	$ 36,457	$ 12,420
Adjustments
Disclosure Basis of Presentation Details [Line Items]
Net income attributable to Weight Watchers International, Inc.		(2,684)
Provision for income taxes		$ 2,684

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