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Restaurant Information by Ownership Type (Detail) - Restaurant
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Number of Restaurants 36,899 36,525 36,258
Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 31,230 30,081 29,544
Company-operated restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 5,669 6,444 6,714
Conventional franchised | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 21,559 21,147 20,774
Developmental licensed | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 6,300 5,529 5,228
Affiliated | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 3,371 3,405 3,542