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Impairment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Long-Lived Assets	$ 0		$ 0
Segment Reporting Information [Line Items]
Asset Impairment Charges			168,400,000
Allegiant Air
Segment Reporting Information [Line Items]
Asset Impairment Charges			5,000,000.0
Sunseeker Resorts
Segment Reporting Information [Line Items]
Asset Impairment Charges	0		136,800,000
Other
Segment Reporting Information [Line Items]
Asset Impairment Charges			26,600,000
Allegiant Nonstop | Other
Segment Reporting Information [Line Items]
Asset Impairment Charges	$ 0	$ 18,300,000
Teesnap | Other
Segment Reporting Information [Line Items]
Asset Impairment Charges		$ 8,300,000
Airbus A320 Aircraft Series | Allegiant Air
Segment Reporting Information [Line Items]
Asset Impairment Charges			$ 0

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

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- References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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