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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%