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COVID-19 COVID-19 Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Operating Special Charge, Total | $ 81,169 |  | $ 247,267
Non-Operating Special Charge, Total | 19,830 |  | 26,632
Special Charges | 100,999 |  | 273,899
Allegiant Air |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Special Charge | 75,902 |  | 85,442
Non-Operating Special Charge | 0 |  | 0
Special Charges | 75,902 |  | 85,442
Sunseeker Resorts |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Special Charge | 5,452 |  | 135,443
Non-Operating Special Charge | 19,830 | $ 6,800 | 26,632
Special Charges | 25,282 |  | 162,075
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Special Charge | (185) |  | 26,382
Non-Operating Special Charge | 0 |  | 0
Special Charges | $ (185) |  | $ 26,382

X
- Definition Non-Operating Special Charge + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Non-Operating Special Charge, Total + References No definition available. + Details
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Namespace Prefix: | algt_
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- Definition Operating Special Charge + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Operating Special Charge, Total + References No definition available. + Details
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- Definition Special Charges, Total + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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