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Commitments and contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended 36 Months Ended
Aug. 03, 2007
period
Dec. 31, 2024
Dec. 31, 2023
USD ($)
restaurant
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]            
Reinvestment plan term     3 years      
Percentage of gross sales of restaurants 5.00%          
Initial royalty period 10 years          
Royalty fee (as a percent)     6.00% 5.60% 5.20%  
Number of subsequent payment periods | period 2          
Percentage of gross sales on advertising and promotion activities     5.00%      
Required minimum fixed charge coverage ratio     1.50      
Maximum leverage ratio     4.25      
Number of new restaurants | restaurant     200      
Number of modernize restaurants | restaurant     400      
Provision for contingencies     $ 50,619 $ 44,839    
Provision for contingencies, current     1,447 2,272    
Provision for contingencies, noncurrent     49,172 42,567    
Provision related to claims covered by indemnification agreement     1,458 $ 1,297    
Minimum            
Line of Credit Facility [Line Items]            
Tax law, estimate of possible loss     511,000      
Maximum            
Line of Credit Facility [Line Items]            
Tax law, estimate of possible loss     576,000      
Standby letters of credit            
Line of Credit Facility [Line Items]            
Standby letters of credit with an aggregate drawing amount     $ 80,000      
Scenario, forecast            
Line of Credit Facility [Line Items]            
Royalty fee (as a percent)   6.00%        
Capital expenditures           $ 650,000
Next five years            
Line of Credit Facility [Line Items]            
Royalty fee (as a percent) 6.00%          
Last five years            
Line of Credit Facility [Line Items]            
Initial royalty period 5 years          
Royalty fee (as a percent) 7.00%