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Subsequent Events (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2018 $ / shares | Mar. 20, 2018 installment $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares | Feb. 05, 2018 / $
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends to Arcos Dorados Holdings Inc.'s shareholders, per share (in dollars per share) | $ / shares |  |  | $ 0 | $ 0 | $ 0.24 |
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, dividends per share, declared (in dollars per share) | $ / shares |  | $ 0.10 |  |  |  |
Common stock, dividends, number of payment installments | installment |  | 2 |  |  |  |
Dividends to Arcos Dorados Holdings Inc.'s shareholders, per share (in dollars per share) | $ / shares | $ 0.05 |  |  |  |  |
Venezuela [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Net monetary position |  |  | $ (9.7) |  |  |
Venezuela [Member] | DICOM [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Foreign currency exchange rate (in VEF per USD) | / $ |  |  |  |  |  | 25,000
Cash and Cash Equivalents [Member] | Venezuela [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Assets, reporting currency denominated |  |  | 13.0 |  |  |
Assets, Excluding Cash and Cash Equivalents [Member] | Venezuela [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Assets, reporting currency denominated |  |  | 75.2 |  |  |
Property, Plant and Equipment, and Advances to Suppliers [Member] | Venezuela [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Assets, reporting currency denominated |  |  | $ 33.5 |  |  |

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