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Commitments and Contingencies Payments Related to Commitments to Purchase (Tables) | 3 Months Ended
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Mar. 31, 2020
Payments Related to Commitments to Purchase [Abstract] |
Long-term Purchase Commitment [Table Text Block] | The Company's contractual purchase commitments consist primarily of aircraft and engine acquisitions. The total future commitments are as follows:
(in thousands) | March 31, 2020
Remaining in 2020 | $ | 126,141 |
2021 | 37,900 |
2022 | 21,000 |
Total commitments | $ | 185,041 |

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- Definition Payments Related to Commitments to Purchase [Abstract] + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | xbrli:stringItemType
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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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