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Commitments and contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
USD ($)
period
Dec. 31, 2019
USD ($)
Dec. 31, 2014
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    
Number of subsequent payment periods | period   2    
Percentage of gross sales on advertising and promotion activities   5.00% 5.00%  
Required minimum fixed charge coverage ratio   1.50    
Maximum leverage ratio   4.25    
Provision for contingencies   $ 26,948 $ 26,158  
Provision for contingencies, current   2,024 2,035  
Provision for contingencies, noncurrent   24,924 24,123  
Provision related to claims covered by indemnification agreement   $ 1,259 $ 1,612  
Covid-19 Pandemic        
Line of Credit Facility [Line Items]        
Percentage of gross sales on advertising and promotion activities   4.00%    
Scenario, Forecast        
Line of Credit Facility [Line Items]        
Percentage of gross sales of restaurants 5.30%      
Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Standby letters of credit with an aggregate drawing amount   $ 80,000    
Puerto Rican Franchisees Lawsuit        
Line of Credit Facility [Line Items]        
Damage sought   66,700    
Puerto Rico Owner Operator's Association        
Line of Credit Facility [Line Items]        
Damage sought   $ 31,000   $ 30,000
Next Five Years        
Line of Credit Facility [Line Items]        
Royalty fee (as a percent)   6.00%    
Subsequent period of the agreement   5 years    
Last Five Years        
Line of Credit Facility [Line Items]        
Royalty fee (as a percent)   7.00%    
Subsequent period of the agreement   5 years    
Credit Suisse        
Line of Credit Facility [Line Items]        
Debt to EBITDA ratio (lower than)   4.0    
Credit Suisse | Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Standby letters of credit with an aggregate drawing amount   $ 45,000    
Itau Unibanco S.A | Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Standby letters of credit with an aggregate drawing amount   $ 15,000    
JP Morgan S.A.        
Line of Credit Facility [Line Items]        
Debt to EBITDA ratio (lower than)   4.5    
JP Morgan S.A. | Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Standby letters of credit with an aggregate drawing amount   $ 20,000    
Minimum        
Line of Credit Facility [Line Items]        
Tax law, estimate of possible loss   226,000    
Maximum        
Line of Credit Facility [Line Items]        
Tax law, estimate of possible loss   $ 249,000