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Impairment (Details)
6 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Property, Plant and Equipment [Abstract]    
Long-Lived Assets $ 0 $ 0
Segment Reporting Information [Line Items]    
Asset Impairment Charges   168,400,000
Allegiant Air    
Segment Reporting Information [Line Items]    
Asset Impairment Charges   5,000,000.0
Sunseeker Resorts    
Segment Reporting Information [Line Items]    
Asset Impairment Charges 0 136,800,000
Other    
Segment Reporting Information [Line Items]    
Asset Impairment Charges   26,600,000
Allegiant Nonstop | Other    
Segment Reporting Information [Line Items]    
Asset Impairment Charges $ 0 18,300,000
Teesnap | Other    
Segment Reporting Information [Line Items]    
Asset Impairment Charges   8,300,000
Airbus A320 Aircraft Series | Allegiant Air    
Segment Reporting Information [Line Items]    
Asset Impairment Charges   $ 0