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COVID-19 COVID-19 (Details)		1 Months Ended			3 Months Ended	6 Months Ended	60 Months Ended
	Apr. 20, 2020 USD ($) $ / shares shares	Jul. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) Aircraft shares	Apr. 30, 2020	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($) Aircraft engine shares	Apr. 30, 2025
Unusual or Infrequent Item, or Both [Line Items]
Special Charges, Total					$ 100,999,000	$ 273,899,000
Total Expected Receipts of Relief Through Payroll Support Program of CARES Act	$ 171,900,000
Debt Instrument, Term				8 years
Number of Installments Received					3
Proceeds from Government Assistance, Payroll Support Program, CARES Act					$ 154,700,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	25,889		19,700		19,700	19,700
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants			$ 1,000,000.0
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 83.33
Asset Impairment Charges						$ 168,400,000
Other Aircraft Related Costs						$ 58,600,000
Number of Engines Retired | engine						5
Number Of Aircraft In Sale-Leaseback Transactions | Aircraft			4
Postemployment Benefits, Period Expense						$ 19,700,000
Termination Loans			$ 19,800,000		$ 19,800,000	19,800,000
Other Expenses						2,400,000
Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from Government Assistance, Payroll Support Program, CARES Act		$ 17,200,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares		6,189
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants		$ 300,000
Unsecured Debt [Member] | Payroll Support Program Loan CARES Act [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt Instrument, Term	10 years			10 years
Proceeds From Payroll Support Program, Low-Interest Loan					16,400,000	21,600,000
Unsecured Debt [Member] | Payroll Support Program Loan CARES Act [Member] | Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Proceeds From Payroll Support Program, Low-Interest Loan		$ 5,200,000
Debt Instrument, Interest Rate Terms							P5Y
Sunseeker Resorts
Unusual or Infrequent Item, or Both [Line Items]
Special Charges, Total					25,282,000	162,075,000
Asset Impairment Charges					0	136,800,000
Postemployment Benefits, Period Expense						400,000
Construction Suspension Expense						5,000,000.0
Other
Unusual or Infrequent Item, or Both [Line Items]
Special Charges, Total					(185,000)	26,382,000
Asset Impairment Charges						26,600,000
Allegiant Air
Unusual or Infrequent Item, or Both [Line Items]
Special Charges, Total					$ 75,902,000	85,442,000
Asset Impairment Charges						5,000,000.0
Postemployment Benefits, Period Expense						$ 19,300,000
Airbus A320 Aircraft Series
Unusual or Infrequent Item, or Both [Line Items]
Number of Aircraft Retired | Aircraft						7
Airbus A320 Aircraft Series | Allegiant Air
Unusual or Infrequent Item, or Both [Line Items]
Asset Impairment Charges						$ 0

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