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Long-Term Debt - Components of Long-Term Debt (Detail)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Aircraft
Sep. 30, 2021
USD ($)
Apr. 23, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Aircraft
Feb. 13, 2020
USD ($)
Feb. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Components of Long-Term Debt [Abstract]                    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   $ 130,053                
Long-term Debt, Maturities, Repayments of Principal in Year Two   130,723                
Long-term Debt, Maturities, Repayments of Principal in Year Three   800,849                
Long-term Debt, Maturities, Repayments of Principal in Year Four   107,434                
Long-term Debt, Maturities, Repayments of Principal in Year Five   100,776                
Long-term Debt, Maturities, Repayments of Principal after Year Five   472,704                
Secured Long-term Debt, Noncurrent   1,742,539     $ 1,659,011          
Debt Issuance Costs, Net   $ 23,400     $ 23,500          
Debt Instrument, Face Amount     $ 84,000 $ 1,700   $ 150,000 $ 31,000 $ 545,500 $ 450,000  
Line of Credit Facility, Maximum Borrowing Capacity $ 50,000                 $ 81,000
Repayments of Lines of Credit $ 46,500                  
Debt Instrument, Term 24 months                  
Number Of Aircrafts Included As Collateral | Aircraft   0         2      
Deposit into Construction Disbursement Account   $ 30,000