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Leases - Lease liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Lease Liabilities [Line Items]    
Current portion of lease liability $ 83,605 $ 97,732
Long Term Lease liability 146,905 206,832
Lease Liabilities 230,510 304,564
Aircraft [member]    
Disclosure Of Lease Liabilities [Line Items]    
Current portion of lease liability 77,777 91,246
Long Term Lease liability 125,216 179,031
Real Estate [Member]    
Disclosure Of Lease Liabilities [Line Items]    
Current portion of lease liability 5,828 6,486
Long Term Lease liability $ 21,689 $ 27,801