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Significant Accounting Judgments, Estimates and Assumptions - Additional Information (Detail) - Aircraft
Dec. 31, 2020
Dec. 31, 2019
Disclosure of voluntary change in accounting policy [line items]    
Salvage value assets rate 15.00%  
Air crafts held for sale   14
Boeing 737-700 [member]    
Disclosure of voluntary change in accounting policy [line items]    
Air crafts held for sale 14