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Restaurant Information by Ownership Type (Detail) - Restaurant
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Number of Restaurants 36,525 36,258 35,429
Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 30,081 29,544 28,691
Company-operated restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 6,444 6,714 6,738
Conventional franchised | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 21,147 20,774 20,355
Developmental licensed | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 5,529 5,228 4,747
Affiliated | Franchised restaurants:      
Segment Reporting Information [Line Items]      
Number of Restaurants 3,405 3,542 3,589