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Related party transactions (Summary of Related Party Transactions) (Details) - Axionlog Distribution B.V. - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

X

- Definition

Logistics service fees 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

X

- 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

X

- 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_
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Balance Type:	debit
Period Type:	duration

X

- 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_
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X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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