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Computation of Basic and Diluted (Loss) Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ (10,687)	$ 39,112
Denominator:
Weighted average shares of common stock outstanding	66,964	65,123
Effect of dilutive common stock equivalents		4,378
Weighted average diluted common shares outstanding	66,964	69,501
(Loss) earnings per share attributable to Weight Watchers International, Inc.
Basic	$ (0.16)	$ 0.60
Diluted	$ (0.16)	$ 0.56

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