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Employee Benefit Plans - Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postemployment Benefits [Abstract] |  |  |
Total number of shares purchased in year | 99,802 | 73,268 | 39,760
Average price paid per share (in dollars per share) | $ 85.27 | $ 97.85 | $ 174.68
Weighted-average fair value of discount under the ESPP | $ 14.44 | $ 16.25 | $ 30.00

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- Definition This element represents the value of the discount applied to the market value for shares available to participating employees under the employee stock purchase plan. + References No definition available. + Details
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Namespace Prefix: | algt_
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Balance Type: | debit
Period Type: | duration

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- Definition This element represents the weighted average fair value of each purchase right under the employee stock purchase plan. + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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Balance Type: | na
Period Type: | duration