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Commitments and contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended
Aug. 03, 2007
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
USD ($)
restaurant
period
Dec. 31, 2021
USD ($)
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)       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  
Capital expenditures       $ 650,000  
Provision for contingencies       44,839 $ 34,086
Provision for contingencies, current       2,272 2,140
Provision for contingencies, noncurrent       42,567 31,946
Provision related to claims covered by indemnification agreement       1,297 $ 1,188
Scenario, Forecast          
Line of Credit Facility [Line Items]          
Royalty fee (as a percent)   6.00%      
Scenario, Forecast | Subsequent Event          
Line of Credit Facility [Line Items]          
Royalty fee (as a percent)     6.00%    
Standby Letters of Credit          
Line of Credit Facility [Line Items]          
Standby letters of credit with an aggregate drawing amount       $ 80,000  
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%        
Minimum          
Line of Credit Facility [Line Items]          
Tax law, estimate of possible loss       $ 430,000  
Maximum          
Line of Credit Facility [Line Items]          
Tax law, estimate of possible loss       $ 469,000