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New Standards and Interpretations Not Yet Adopted - Summary of Impacts Due to the Adoption of New Standard In Consolidated Statement of Profit or Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenue      
Passenger revenue $ 2,462,419 $ 2,155,167 $ 2,185,465
Cargo and mail revenue 55,290 53,989 56,738
Other operating revenue 9,847 12,696 11,507
Total operating revenue 2,527,556 2,221,852 2,253,710
Operating expenses      
Sales and distribution 200,413 193,984 188,961
Total operating expenses 2,097,913 1,954,332 2,001,076
Operating profit 429,643 267,520 252,634
Non - operating income (expense) (10,675) 96,679 (460,509)
Profit (loss) before taxes 418,968 364,199 (207,875)
Income tax expense (49,310) (38,271) (32,759)
Net profit (loss) 369,658 325,928 $ (240,634)
Restatement information without impact of IFRS 15 [Member]      
Operating revenue      
Passenger revenue 2,462,419 2,155,167  
Cargo and mail revenue 55,290 53,989  
Other operating revenue 9,847 12,696  
Total operating revenue 2,527,556 2,221,852  
Operating expenses      
Other operating expenses 1,897,500 1,760,348  
Sales and distribution 200,413 193,984  
Total operating expenses 2,097,913 1,954,332  
Operating profit 429,643 267,520  
Non - operating income (expense) (10,675) 96,679  
Profit (loss) before taxes 418,968 364,199  
Income tax expense (49,310) (38,271)  
Net profit (loss) 369,658 325,928  
Transition impact [member]      
Operating revenue      
Passenger revenue (18,442) (6,666)  
Other operating revenue 12,672 4,000  
Total operating revenue (5,770) (2,666)  
Operating expenses      
Sales and distribution (157) (147)  
Total operating expenses (157) (147)  
Operating profit (5,613) (2,519)  
Profit (loss) before taxes (5,613) (2,519)  
Income tax expense 471 349  
Net profit (loss) (5,142) (2,170)  
IFRS15 [member]      
Operating revenue      
Passenger revenue 2,443,977 2,148,501  
Cargo and mail revenue 55,290 53,989  
Other operating revenue 22,519 16,696  
Total operating revenue 2,521,786 2,219,186  
Operating expenses      
Other operating expenses 1,897,500 1,760,348  
Sales and distribution 200,256 193,837  
Total operating expenses 2,097,756 1,954,185  
Operating profit 424,030 265,001  
Non - operating income (expense) (10,675) 96,679  
Profit (loss) before taxes 413,355 361,680  
Income tax expense (48,839) (37,922)  
Net profit (loss) $ 364,516 $ 323,758