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Leasing Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]      
Net Investment in Lease, Change in Present Value, Expense (Reversal) $ 600.0    
Lease term 20 years    
Weighted Average Lease Term 20 years    
Operating Lease, Weighted Average Discount Rate, Percent 3.80% 4.00%  
Company-operated restaurants:      
Operating Leased Assets [Line Items]      
Percent rents in excess of minimum rents $ 53.7 $ 74.4 $ 82.1
Franchised restaurants:      
Operating Leased Assets [Line Items]      
Percent rents in excess of minimum rents $ 136.5 $ 200.7 $ 200.8
Minimum      
Operating Leased Assets [Line Items]      
Escalation timing 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Escalation timing 5 years