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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 378,911 | $ 419,977
Allegiant Air |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 378,911 | 419,977
Allegiant Air | Scheduled Service Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 197,261 | 234,772
Allegiant Air | Air-related revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 176,964 | 181,700
Allegiant Air | Co-brand Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 4,686 | $ 3,505

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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