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Financial Instrument - Risk Management and Fair Value - Summary of Financial Liabilities According to Maturity Date (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount $ 1,304,015 $ 1,296,987
Derivative financial liabilities   2,801
Up to one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 458,718 365,535
Derivative financial liabilities   2,801
Between 1 and 4 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 549,726 616,031
More than 4 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 434,181 466,105
Debt [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 1,174,581 1,184,132
Debt [member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 329,284 252,680
Debt [member] | Between 1 and 4 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 549,726 616,031
Debt [member] | More than 4 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 434,181 466,105
Accounts payable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 116,554 104,174
Accounts payable [member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 116,554 104,174
Account payable to related parties [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 12,880 8,681
Account payable to related parties [member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 12,880 8,681
Fuel derivative instruments [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities   2,801
Fuel derivative instruments [member] | Up to one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities   2,801
Contractual cash flow [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 1,442,625 1,447,671
Derivative financial liabilities   2,801
Contractual cash flow [member] | Debt [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 1,313,191 1,334,816
Contractual cash flow [member] | Accounts payable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount 116,554 104,174
Contractual cash flow [member] | Account payable to related parties [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Non - derivative financial liabilities carrying amount $ 12,880 8,681
Contractual cash flow [member] | Fuel derivative instruments [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities   $ 2,801