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Summary of Significant Accounting Policies Restaurant Information by Ownership Type (Detail)
Dec. 31, 2021
Restaurant
Dec. 31, 2020
Restaurant
Dec. 31, 2019
Restaurant
Segment Reporting Information [Line Items]      
Number of Restaurants 40,031 39,198 38,695
Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 37,295 36,521 36,059
Company-operated restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 2,736 2,677 2,636
Conventional franchised | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 21,607 21,712 21,837
Developmental licensed | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 7,913 7,663 7,648
Affiliated | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 7,775 7,146 6,574