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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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