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Revenue Recognition Passenger Revenue (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |  |
Contract with Customer, Liability, Forward Bookings |  | 45.00% |
Contract with Customer, Liability, Credit Voucher Bookings |  | 55.00% |
Revenue, Performance Obligation, Description of Timing |  | P12M |
Increase (Decrease) in Revenue from Contract with Customer |  | $ 191,600 |
Contract with Customer, Liability, Current |  | $ 303,835 | $ 249,950
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Credit Voucher Term Expiration | 2 years |  |

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- Definition Contract with Customer, Liability, Credit Voucher Bookings + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract with Customer, Liability, Forward Bookings + References No definition available. + Details
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Namespace Prefix: | algt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Credit Voucher Term Expiration + References No definition available. + Details
Name: | algt_CreditVoucherTermExpiration
Namespace Prefix: | algt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (Decrease) in Revenue from Contract with Customer + References No definition available. + Details
Name: | algt_IncreaseDecreaseinRevenuefromContractwithCustomer
Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 http://asc.fasb.org/extlink&oid=118956577&loc=SL49130554-203045 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |