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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Revenue Recognition [Abstract] |  |  |  |
Contract with Customer, Liability, Forward Bookings |  |  | 39250000000.00% |
Contract with Customer, Liability, Credit Voucher Bookings |  |  | 5860000000.00% |
Revenue, Performance Obligation, Description of Timing |  |  | 12 months |
Air Traffic Liability, Recognized |  | $ 307.5 |  |
Contract with Customer, Liability, Passenger Revenue |  |  | 69.30% |
Credit Voucher Term Expiration | 2 years |  |  |
Points Liability |  |  | $ 29.4 | $ 11.7

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- Definition Air Traffic Liability, Recognized + References No definition available. + Details
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Balance Type: | credit
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- Definition Contract with Customer, Liability, Passenger Revenue + References No definition available. + Details
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Namespace Prefix: | algt_
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- Definition Contract with Customer, Liability, Credit Voucher Bookings + References No definition available. + Details
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- Definition Contract with Customer, Liability, Forward Bookings + References No definition available. + Details
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- Definition Credit Voucher Term Expiration + References No definition available. + Details
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- Definition Points Liability + References No definition available. + Details
Name: | algt_PointsLiability
Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130554-203045 + Details
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- References No definition available. + Details
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