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Leases - Total cash outflow for leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Cash Flows For Leases [Line Items]    
Cash outflow for leases $ 103,392 $ 117,068
Aircraft [member]    
Disclosure Of Cash Flows For Leases [Line Items]    
Cash outflow for leases 97,353 107,610
Real Estate [Member]    
Disclosure Of Cash Flows For Leases [Line Items]    
Cash outflow for leases $ 6,039 $ 9,458