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Leasing Arrangements - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Restaurant
Dec. 31, 2017
USD ($)
Restaurant
Dec. 31, 2016
USD ($)
Restaurant
Operating Leased Assets [Line Items]      
Document Fiscal Year Focus 2018    
Document Period End Date Dec. 31, 2018    
Number of Restaurants 37,855 37,241 36,899
Lease term 20 years    
Company-operated restaurants:      
Operating Leased Assets [Line Items]      
Number of Restaurants 2,770 3,133 5,669
Rents in excess of minimum rents | $ $ 82.1 $ 115.6 $ 135.0
Franchised restaurants:      
Operating Leased Assets [Line Items]      
Number of Restaurants 35,085 34,108 31,230
Rents in excess of minimum rents | $ $ 200.8 $ 204.9 $ 186.4
Ground Leases      
Operating Leased Assets [Line Items]      
Number of Restaurants 12,334    
Minimum      
Operating Leased Assets [Line Items]      
Escalation timing 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Escalation timing 5 years