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Computation of Basic and Diluted (Loss) Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Numerator:    
Net (loss) income attributable to Weight Watchers International, Inc. $ (5,433)us-gaap_NetIncomeLoss $ 21,531us-gaap_NetIncomeLoss
Denominator:    
Weighted average shares of common stock outstanding 56,806us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 56,428us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive common stock equivalents 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 78us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average diluted common shares outstanding 56,806us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 56,506us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
(Loss) Earnings Per Share attributable to Weight Watchers International, Inc.    
Basic $ (0.10)us-gaap_EarningsPerShareBasic $ 0.38us-gaap_EarningsPerShareBasic
Diluted $ (0.10)us-gaap_EarningsPerShareDiluted $ 0.38us-gaap_EarningsPerShareDiluted