Description of Business - Additional Information (Detail)	Mar. 12, 2015	Jan. 01, 2019 state restaurant	Jan. 02, 2018 restaurant
Franchisor Disclosure [Line Items]
Number of states in which entity operates | state		14
Stock purchase agreement date	Mar. 12, 2015
Entity operated units
Franchisor Disclosure [Line Items]
Number of restaurants		322
Franchised units
Franchisor Disclosure [Line Items]
Number of restaurants		258
Franchised units | GUAM
Franchisor Disclosure [Line Items]
Number of restaurants		1	1