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Summary of Significant Accounting Policies Basis - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 03, 2025 USD ($) | Aug. 31, 2021 point | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | May 31, 2023 pay
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Inventory Valuation Reserves |  |  |  | $ 12,600 | $ 14,700 | $ 12,600 |  |
Accounts Receivable, before Allowance for Credit Loss, Noncurrent |  |  |  | 15,100 | 10,500 | 15,100 |  |
Capitalized Computer Software, Net |  |  |  | 149,700 | 139,700 | 149,700 |  |
Capitalized Computer Software, Amortization |  |  |  |  | 19,200 | 18,800 | $ 12,400 |
Impairment of Long-Lived Assets to be Disposed of |  |  | $ 100,400 |  |  |  |  |
Deferred Credits and Other Liabilities |  |  |  | 16,800 | 40,200 | 16,800 |  |
Accounts Receivable, Allowance for Credit Loss |  |  |  | 17,000 | 7,100 | 17,000 |  |
Accrued Retention Bonus, Current Payment Percentage |  |  |  |  |  |  |  | 35.00%
Accrued Retention Bonus, Minimum Pay Credit Hours Per Month | pay |  |  |  |  |  |  |  | 85
Accrued Retention Bonus, Employee Exception Percentage |  |  |  |  |  |  |  | 82.00%
Accrued pilot retention bonus |  |  |  | 146,129 | 235,887 | 146,129 |  |
Advertising Expense |  |  |  |  | $ 29,100 | $ 32,000 | 41,000 |
Preopening Expense |  |  |  |  |  |  | $ 26,500 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  | 290,873 | 452,560 | 81,748 |
Allways Rewards Loyalty Program |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number Of Points Earned For Every Dollar Spent | point |  | 1 |  |  |  |  |  |
Number Of Points Earned For Every Dollar Spent Over Five Hundred Dollars | point |  | 2 |  |  |  |  |  |
Sunseeker Resort (1) |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sunseeker impairment | $ 100,400 |  |  | $ 321,800 | $ 98,300 | $ 321,800 |  |
A320 Series Engine |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Deferred Costs for Heavy Maintenance |  |  |  |  | 45,900 | 76,800 |  |
Amortization of Other Deferred Charges |  |  |  |  | $ 64,400 | $ 65,800 | $ 55,500 |
Minimum | Computer hardware and software |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 3 years |  |  |
Maximum | Computer hardware and software |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 15 years |  |  |
Allegiant Travel Company |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00% |  |  |

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