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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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