XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.23.2

Revenue Recognition - Contract with Customer, Contract Asset, Contract Liability, and Receivable (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Points Liability [Abstract] |  |
Points balance at January 1 | $ 56,541 | $ 40,490
Points awarded (deferral of revenue) | 35,625 | 35,821
Points redeemed (recognition of revenue) | (27,321) | (22,354)
Points balance at June 30 | $ 64,845 | $ 53,957

X
- Definition Points Liability [Abstract] + References No definition available. + Details
Name: | algt_PointsLiabilityAbstract
Namespace Prefix: | algt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Points awarded + References No definition available. + Details
Name: | algt_Pointsawarded
Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Points redeemed + References No definition available. + Details
Name: | algt_Pointsredeemed
Namespace Prefix: | algt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant