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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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