Business Combination - Schedule of Preliminary Values Allocated to Intangible Assets and Useful Lives (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Jan. 02, 2019	Jan. 02, 2018	Jan. 03, 2017
Business Acquisition [Line Items]
Restaurant closure liability	$ 400	$ 2,400
Finite lived intangible assets acquired	10,827	18,507
Total intangible assets	10,827	18,507	$ 10,931
Franchise rights
Business Acquisition [Line Items]
Finite lived intangible assets acquired	$ 8,833	$ 10,621
Useful life of finite lived intangible assets (in years)		40 years
Weighted average life of definite-lived intangibles (in years)	12 years 10 months 25 days
Restaurant Closures Prior to 2015 [Member]
Business Acquisition [Line Items]
Restaurant closure liability		$ 0
Closure of 12 Underperforming Restaurants [Member]
Business Acquisition [Line Items]
Restaurant closure liability	$ 437	$ 2,092		$ 1,611	$ 1,773