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Financial Instrument - Risk Management and Fair Value - Summary of Financial Instruments Measured at Fair Value (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Disclosure of fair value measurement of liabilities [line items]  
Fuel derivatives $ 2,801
Fuel derivative instruments [member]  
Disclosure of fair value measurement of liabilities [line items]  
Fuel derivatives 2,801
Level 2 of Fair Value Hierarchy [Member]  
Disclosure of fair value measurement of liabilities [line items]  
Fuel derivatives 2,801
Level 2 of Fair Value Hierarchy [Member] | Fuel derivative instruments [member]  
Disclosure of fair value measurement of liabilities [line items]  
Fuel derivatives $ 2,801