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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		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 70,720	$ 45,173	$ 109,832	$ 55,825
Denominator:
Weighted average shares of common stock outstanding	66,400	64,269	65,761	64,124
Effect of dilutive common stock equivalents	3,754	3,468	4,153	3,180
Weighted average diluted common shares outstanding	70,154	67,737	69,914	67,304
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 1.07	$ 0.70	$ 1.67	$ 0.87
Diluted	$ 1.01	$ 0.67	$ 1.57	$ 0.83

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