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Subsequent Events - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
shares
Awards
Aircraft
Boeing 737 MAX aircraft [member]  
Disclosure of non-adjusting events after reporting period [line items]  
No of aircrafts held for sale delivered | Aircraft 6
Major ordinary share transactions [member]  
Disclosure of non-adjusting events after reporting period [line items]  
Non-vested stock, number of awards approved | Awards 2
Non-vested stock, grant | shares 136,654
Estimated fair vaule $ 11.5
Estimated compensation cost for next year $ 5.7
Non-vested stock, vesting period vest over a period of three to five years.