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Computation of Basic and Diluted Earnings (Net Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Numerator:
Net income (loss) attributable to Weight Watchers International, Inc.	$ 10,653	$ (10,753)
Denominator:
Weighted average shares of common stock outstanding	63,978	63,546
Effect of dilutive common stock equivalents	2,549	0
Weighted average diluted common shares outstanding	66,527	63,546
Earnings (Net Loss) Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.17	$ (0.17)
Diluted	$ 0.16	$ (0.17)

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