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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 07, 2017	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016	Jun. 27, 2016
Goodwill and Intangible Assets Disclosure
Goodwill		$ 170,731		$ 170,731		$ 166,138
Franchise right maturity period				7 years
Finite-lived intangible assets, aggregate amortization expense		$ 9,120	$ 9,137	$ 27,310	$ 26,161
Weight Watchers of Greater Miami, Inc.
Goodwill and Intangible Assets Disclosure
Goodwill							$ 2,945
Franchise Rights | VPM
Goodwill and Intangible Assets Disclosure
Amortization period				2 years
Franchise Rights | Weight Watchers of Greater Miami, Inc.
Goodwill and Intangible Assets Disclosure
Amortization period				3 months
Maximum | Franchise Rights
Goodwill and Intangible Assets Disclosure
Finite-lived intangible assets, estimated useful life (in years)				1 year
BRAZIL
Goodwill and Intangible Assets Disclosure
Reporting unit, percentage of fair value in excess of carrying amount		10.00%		10.00%
Goodwill		$ 20,044		$ 20,044
Franchise Rights
Goodwill and Intangible Assets Disclosure
Indefinite-lived intangible assets, impairment charges	$ 0

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+ References

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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