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Related party transactions (Summary of Related Party Transactions) (Details) - Axionlog Distribution B.V. - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Food and paper | $ (177,356) | $ (173,387) | $ (163,536)
Occupancy and other operating expenses | (5,322) | (4,281) | (3,882)
Net interest income | 0 | 0 | 47
Logistics service fees from related party | 41,633 | 48,773 | 40,714
Suppliers purchase expense related party | $ 135,723 | $ 124,614 | $ 122,822

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- Definition Food and paper from related party + References No definition available. + Details
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Namespace Prefix: | arco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Logistics service fees from related party + References No definition available. + Details
Name: | arco_LogisticsServiceFeesFromRelatedParty
Namespace Prefix: | arco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Suppliers purchase expense related party + References No definition available. + Details
Name: | arco_SuppliersPurchaseExpenseRelatedParty
Namespace Prefix: | arco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |