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Summary of Significant Accounting Policies - (Details)
 12 Months Ended
Dec. 31, 2020
Building | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 10.00
Building | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 25.00
Equipment And Leasehold Improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 3.00
Equipment And Leasehold Improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 10.00
Computer Hardware and Software | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 3.00
Property, Plant and Equipment, Useful Life 3 years
Computer Hardware and Software | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 10.00
Property, Plant and Equipment, Useful Life 10 years
Airbus A320 Aircraft Series | Aircraft And Engines | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 10.00
Airbus A320 Aircraft Series | Aircraft And Engines | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Estimated Useful Lives 25.00