Goodwill and other intangible assets Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Intangible Assets And Goodwill [Line Items]
Gross carrying amount	$ 1,607,299	$ 1,609,084
Accumulated amortization	(250,142)	(230,364)
Net carrying amount	1,357,157	1,378,720
Trade names | Indefinite-lived intangible:
Intangible Assets And Goodwill [Line Items]
Gross carrying amount	1,190,970	1,190,970
Net carrying amount	$ 1,190,970	$ 1,190,970
Franchise rights | Definite-lived intangibles:
Intangible Assets And Goodwill [Line Items]
Weighted average amortization period (years)	20 years	20 years
Gross carrying amount	$ 358,228	$ 358,166
Accumulated amortization	(211,892)	(193,940)
Net carrying amount	$ 146,336	$ 164,226
Favorable operating leases acquired | Definite-lived intangibles:
Intangible Assets And Goodwill [Line Items]
Weighted average amortization period (years)	18 years	18 years
Gross carrying amount	$ 58,101	$ 59,948
Accumulated amortization	(38,250)	(36,424)
Net carrying amount	$ 19,851	$ 23,524