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Subsequent events (Narrative) (Details) |  |  |  |  |  | 12 Months Ended
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Dec. 12, 2019 $ / shares | Aug. 14, 2019 $ / shares | Apr. 12, 2019 $ / shares | Mar. 26, 2019 installment $ / shares | Mar. 20, 2018 installment | Dec. 31, 2018 $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends to Arcos Dorados Holdings Inc.'s shareholders, per share (in dollars per share) |  |  |  |  |  | $ 0.10
Class A |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, dividends, number of payment installments | installment |  |  |  |  | 2 |
Class A | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, dividends per share, declared (in dollars per share) |  |  |  | $ 0.11 |  |
Common stock, dividends, number of payment installments | installment |  |  |  | 3 |  |
Dividends to Arcos Dorados Holdings Inc.'s shareholders, per share (in dollars per share) | $ 0.03 | $ 0.03 | $ 0.05 |  |  |
Class B |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, dividends, number of payment installments | installment |  |  |  |  | 2 |
Class B | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, dividends per share, declared (in dollars per share) |  |  |  | $ 0.11 |  |
Common stock, dividends, number of payment installments | installment |  |  |  | 3 |  |
Dividends to Arcos Dorados Holdings Inc.'s shareholders, per share (in dollars per share) | $ 0.03 | $ 0.03 | $ 0.05 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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