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Impact of the COVID-19 Pandemic - Summary of Special Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Unusual or Infrequent Items, or Both [Abstract] |  |  |  |
Operating | $ 142 | $ 1,738 |  |
Non-operating | 0 | 0 |  |
Total special charges | $ 142 | $ 1,738 | $ 100 | $ 1,700

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

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

X
- Definition Special Charges, Total + References No definition available. + Details
Name: | algt_SpecialChargesTotal
Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration