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Leases - Right of use assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Right of use assets, Beginning balance $ 290,843 $ 361,993 $ 384,350
Additions   31,674 84,770
Additions/(Terminations) 19,818    
Impairment (1,541) 0 0
Depreciation expense (94,841) (102,824) (107,127)
Right of use assets, Ending balance 214,279 290,843 361,993
Aircraft [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right of use assets, Beginning balance 260,647 333,049 350,517
Additions   23,162 83,389
Additions/(Terminations) 21,706    
Impairment (1,541)    
Depreciation expense (88,451) (95,564) (100,857)
Right of use assets, Ending balance 192,361 260,647 333,049
Real Estate [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right of use assets, Beginning balance 30,196 28,944 33,833
Additions   8,512 1,381
Additions/(Terminations) (1,888)    
Impairment 0    
Depreciation expense (6,390) (7,260) (6,270)
Right of use assets, Ending balance $ 21,918 $ 30,196 $ 28,944