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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. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 53,834	$ 70,720	$ 43,148	$ 109,832
Denominator:
Weighted average shares of common stock outstanding	67,124	66,400	67,044	65,761
Effect of dilutive common stock equivalents	2,017	3,754	2,224	4,153
Weighted average diluted common shares outstanding	69,141	70,154	69,268	69,914
Earnings per share attributable to Weight Watchers International, Inc.
Basic	$ 0.80	$ 1.07	$ 0.64	$ 1.67
Diluted	$ 0.78	$ 1.01	$ 0.62	$ 1.57

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