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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Goodwill [Line Items]
Beginning balance			$ 157,916
Goodwill impairment	$ 0	$ 0	(3,665)	$ 0
Effect of exchange rate changes			(1,460)
Ending balance	152,791		152,791
North America
Goodwill [Line Items]
Beginning balance			143,940
Goodwill impairment			0
Effect of exchange rate changes			(933)
Ending balance	143,007		143,007
Continental Europe
Goodwill [Line Items]
Beginning balance			7,015
Goodwill impairment			0
Effect of exchange rate changes			228
Ending balance	7,243		7,243
United Kingdom
Goodwill [Line Items]
Beginning balance			1,213
Goodwill impairment			0
Effect of exchange rate changes			(31)
Ending balance	1,182		1,182
Other
Goodwill [Line Items]
Beginning balance			5,748
Goodwill impairment			(3,665)
Effect of exchange rate changes			(724)
Ending balance	$ 1,359		$ 1,359

X

- Definition

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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