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Leasing Arrangements - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Restaurant
Dec. 31, 2016
USD ($)
Restaurant
Dec. 31, 2015
USD ($)
Restaurant
Operating Leased Assets [Line Items]      
Document Fiscal Year Focus 2017    
Document Period End Date Dec. 31, 2017    
Number of Restaurants 37,241 36,899 36,525
Lease term 20 years    
Company-operated restaurants:      
Operating Leased Assets [Line Items]      
Number of Restaurants 3,133 5,669 6,444
Rents in excess of minimum rents | $ $ 115.6 $ 135.0 $ 146.6
Franchised restaurants:      
Operating Leased Assets [Line Items]      
Number of Restaurants 34,108 31,230 30,081
Rents in excess of minimum rents | $ $ 204.9 $ 186.4 $ 178.8
Ground Leases      
Operating Leased Assets [Line Items]      
Number of Restaurants 12,262    
Minimum      
Operating Leased Assets [Line Items]      
Escalation timing 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Escalation timing 5 years