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Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of summary of significant accounting policies [line items]      
Impairment loss $ 0 $ 0 $ 0
Useful lives of property and equipment   The Company concluded that airframe and engines are now expected to remain in operation for 27 years from the purchase date. As consequence the expected useful life of the fleet decreased by 3 years.  
Applicable tax rate 25.00% 25.00% 25.00%
Panama [member]      
Disclosure of summary of significant accounting policies [line items]      
Applicable tax rate 25.00%    
Dividends Tax Rate, Panamanian source income 10.00%    
Dividends Tax Rate, foreign source income 5.00%    
Bottom of range [member] | Computer software licenses [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 3 years    
Bottom of range [member] | Software development [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 5 years    
Bottom of range [member] | Computer software development [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 3 years    
Top of range [member] | Computer software licenses [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 8 years    
Top of range [member] | Software development [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 15 years    
Top of range [member] | Computer software development [member]      
Disclosure of summary of significant accounting policies [line items]      
Estimated useful lives 5 years