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Summary of Significant Accounting Policies Restaurant Information by Ownership Type (Detail)
Dec. 31, 2019
Restaurant
Dec. 31, 2018
Restaurant
Dec. 31, 2017
Restaurant
Segment Reporting Information [Line Items]      
Number of Restaurants 38,695 37,855 37,241
Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 36,059 35,085 34,108
Company-operated restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 2,636 2,770 3,133
Conventional franchised | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 21,837 21,685 21,366
Developmental licensed | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 7,648 7,225 6,945
Affiliated | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 6,574 6,175 5,797