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Shareholders' equity - Narrative (Details)
12 Months Ended
Aug. 12, 2020
shares
Jul. 06, 2020
USD ($)
period
$ / shares
shares
Mar. 03, 2020
installment
$ / shares
Feb. 15, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Dec. 10, 2020
$ / shares
Aug. 13, 2020
$ / shares
Apr. 10, 2020
$ / shares
May 22, 2018
USD ($)
$ / shares
Dec. 31, 2017
$ / shares
shares
Class of Stock [Line Items]                        
Common stock authorized (in shares)         500,000,000              
Common stock, par value (in dollars per share) | $ / shares         $ 0             $ 0
Common stock outstanding (in shares)                       211,072,508
Repurchased share distributed (in shares) 2,723,614 2,723,614                    
Common stock issued (in shares)         207,265,773 204,070,029 205,232,247         211,072,508
Dividends payable (in dollars per share) | $ / shares   $ 0.03                    
Number of dividend payments | period   2                    
Stock Dividends to Arcos Dorados Holdings Inc.’s shareholders, Shares   0.0133333                    
Dividends paid, cash | $   $ 16     $ 10,204,000              
Class A                        
Class of Stock [Line Items]                        
Common stock authorized (in shares)         420,000,000              
Common stock outstanding (in shares)                       131,072,508
Shares issued during the period (in shares)         472,130 470,558 520,565          
Common stock issued (in shares)         127,265,773 124,070,029 125,232,247         131,072,508
Number of votes per share (in votes) | vote         1              
Dividends payable (in dollars per share) | $ / shares     $ 0.11         $ 0.03 $ 0.03 $ 0.05    
Common stock, dividends, number of payment installments | installment     3                  
Class B shares of common stock                        
Class of Stock [Line Items]                        
Common stock authorized (in shares)         80,000,000              
Common stock outstanding (in shares)                       80,000,000
Common stock issued (in shares)         80,000,000 80,000,000 80,000,000         80,000,000
Number of votes per share (in votes) | vote         5              
The Repurchase Program                        
Class of Stock [Line Items]                        
Number of shares repurchased (in shares)       7,993,602                
Value of shares repurchased | $       $ 60,000,000                
The Repurchase Program | Class A                        
Class of Stock [Line Items]                        
Common stock, par value (in dollars per share) | $ / shares                     $ 0  
Shares authorized, value | $                     $ 60,000,000