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Leases - Disclosure of Lease Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation and amortization      
Depreciation and amortization $ 94,841 $ 102,824 $ 107,127
Impairment of non financial assets      
Impairment 1,541 0 0
Other operating and administrative expenses      
Short-term leases 90 364 1,412
Leases of low-value assets 330 733 853
Variable lease payments not include in the measurement of lease liabilities 827 706 611
Lease Cost Operating And Adimninstrative Expenses 758 1,803 2,876
Variable lease payments by rental concessions received (489) 0 0
Finance cost      
Unwinding Of Discount And Changes In The Discount Rate 832 846 796
Finance costs 10,734 14,140 14,975
Total lease costs 107,874 118,767 124,978
Aircraft [member]      
Depreciation and amortization      
Depreciation and amortization 88,451 95,564 100,857
Impairment of non financial assets      
Impairment 1,541    
Finance cost      
Interest expense on lease liabilities 8,185 11,221 12,074
Real Estate [Member]      
Depreciation and amortization      
Depreciation and amortization 6,390 7,260 6,270
Impairment of non financial assets      
Impairment 0    
Finance cost      
Interest expense on lease liabilities $ 1,717 $ 2,073 $ 2,105