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Significant Accounting Policies - Schedule of Significant Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Panama [member] | Copa Airlines [member]
Disclosure of information about unconsolidated subsidiaries [line items]
Ownership interest	99.00%	99.00%
Colombia [member] | Copa Colombia [member]
Disclosure of information about unconsolidated subsidiaries [line items]
Ownership interest	99.00%	99.00%
British Virgin Islands [member] | Oval [member]
Disclosure of information about unconsolidated subsidiaries [line items]
Ownership interest	100.00%	100.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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