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Organization and nature of business (Details) - territory
 12 Months Ended
Dec. 31, 2018
Jul. 20, 2016
Schedule of Equity Method Investments [Line Items]    
Number of territories with operations 20  
Arcos Dorados B.V.    
Schedule of Equity Method Investments [Line Items]    
Equity interest percentage 100.00%  
Martinique, French Guyana, Guadeloupe    
Schedule of Equity Method Investments [Line Items]    
Franchise agreement term 10 years  
Renewed franchise agreement term 10 years  
Number of territories under renewed franchise agreement   3