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Leases - Schedule of Future Minimum Lease Payments Required under Aircraft and Non-aircraft Operating Leases (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Aircraft [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments $ 400,835
Aircraft [member] | Up to one year [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 111,568
Aircraft [member] | One to five years [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 270,310
Aircraft [member] | Over five years [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 18,957
Others [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 107,440
Others [member] | Up to one year [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 14,988
Others [member] | One to five years [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments 74,943
Others [member] | Over five years [member]  
Disclosure of operating lease by lessee [line items]  
Future minimum lease payments $ 17,509