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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 39,112	$ 10,653
Denominator:
Weighted average shares of common stock outstanding	65,123	63,978
Effect of dilutive common stock equivalents	4,378	2,549
Weighted average diluted common shares outstanding	69,501	66,527
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.60	$ 0.17
Diluted	$ 0.56	$ 0.16

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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