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Summary of Significant Accounting Policies Restaurant Information by Ownership Type (Detail)
Dec. 31, 2023
Restaurant
Dec. 31, 2022
Restaurant
Dec. 31, 2021
Restaurant
Segment Reporting Information [Line Items]      
Number of Restaurants 41,822 40,275 40,031
Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 39,680 38,169 37,295
Company-operated restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 2,142 2,106 2,736
Conventional franchised | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 21,818 21,720 21,607
Developmental licensed | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 8,684 8,229 7,913
Affiliated | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 9,178 8,220 7,775