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Operating Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments 3    
PP&E from VIEs $ 3,258,925 $ 3,010,803  
Passenger 902,187 1,682,955 $ 1,533,701
Third party products 46,482 70,012 58,060
Fixed fee contract 26,865 65,057 50,286
Other 14,539 22,941 25,400
Operating Income (Loss) (280,985) 363,950 243,459
Interest Revenue (Expense), Net 50,917 59,806 44,536
Depreciation and amortization 176,267 155,852 129,351
Payments to Acquire Productive Assets 308,350 523,728 340,290
Allegiant Air      
Segment Reporting Information [Line Items]      
PP&E from VIEs 3,214,523 2,830,236  
Passenger 902,187 1,682,955 1,533,701
Third party products 46,482 70,012 58,060
Fixed fee contract 26,865 65,057 50,286
Other 1,462 4,474 17,125
Operating Income (Loss) (104,745) 388,740 255,888
Interest Revenue (Expense), Net 50,355 58,112 44,534
Depreciation and amortization 174,882 151,060 127,460
Payments to Acquire Productive Assets 262,748 438,765 290,998
Sunseeker Resorts      
Segment Reporting Information [Line Items]      
PP&E from VIEs 36,612 133,362  
Other 650 2,048 601
Operating Income (Loss) (145,721) (6,588) (3,299)
Interest Revenue (Expense), Net 562 1,694 2
Depreciation and amortization 615 1,250 129
Payments to Acquire Productive Assets 45,160 66,659 32,635
Other      
Segment Reporting Information [Line Items]      
PP&E from VIEs 7,790 47,205  
Other 12,427 16,419 7,674
Operating Income (Loss) (30,519) (18,202) (9,130)
Interest Revenue (Expense), Net 0 0 0
Depreciation and amortization 770 3,542 1,762
Payments to Acquire Productive Assets $ 442 $ 18,304 $ 16,657