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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 |

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