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Summary of Significant Accounting Policies Basis - Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2021
point
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Property, Plant and Equipment [Line Items]        
Inventory Valuation Reserves   $ 8,100 $ 6,000  
Accounts Receivable, before Allowance for Credit Loss, Noncurrent   18,300 12,400  
Capitalized Computer Software, Net   80,200 43,300  
Capitalized Computer Software, Amortization   15,200 10,600 $ 9,600
Asset Impairment Charges   0 500 161,600
Advertising Expense   $ 40,100 $ 31,300 $ 12,400
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   79,644 815 24,004
Allegiant Travel Company        
Property, Plant and Equipment [Line Items]        
Equity Method Investment, Ownership Percentage   50.00%    
Allways Rewards Loyalty Program        
Property, Plant and Equipment [Line Items]        
Number Of Points Earned For Every Dollar Spent | point 1      
Number Of Points Earned For Every Dollar Spent Over Five Hundred Dollars | point 2      
A320 Series Engine        
Property, Plant and Equipment [Line Items]        
Deferred Costs for Heavy Maintenance   $ 4,100 $ 23,300  
Amortization of Other Deferred Charges   21,500 21,000 $ 17,600
Airbus A320 Aircraft Series        
Property, Plant and Equipment [Line Items]        
Deferred Costs for Heavy Maintenance   56,500 39,000  
Amortization of Other Deferred Charges   $ 22,300 $ 21,100 $ 19,900
Minimum | Computer Hardware and Software        
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Useful Life   3 years    
Maximum | Computer Hardware and Software        
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Useful Life   10 years