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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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