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Fair Value Measurements - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
equipment
Sep. 30, 2020
USD ($)
engine
Sep. 30, 2021
USD ($)
equipment
Sep. 30, 2021
USD ($)
equipment
engine
Sep. 30, 2021
USD ($)
equipment
airframe
Sep. 30, 2020
USD ($)
engine
Dec. 31, 2020
USD ($)
Derivative [Line Items]              
Fair value of notes receivable $ 198,500,000   $ 198,500,000 $ 198,500,000 $ 198,500,000   $ 159,200,000
Fair value of notes payable 1,862,200,000   1,862,200,000 $ 1,862,200,000 $ 1,862,200,000   1,691,000,000
Interest expense 18,325,000 $ 15,351,000 50,331,000     $ 47,136,000  
Asset write-down 0 $ 5,200,000 4,100,000     $ 14,400,000  
Number of assets impaired       4 1    
Remaining book value $ 30,700,000   $ 30,700,000 $ 30,700,000 $ 30,700,000    
Number of assets previously impaired | equipment 16   16 16 16    
Assets to be Sold or Parted Out              
Derivative [Line Items]              
Number of assets impaired | engine   6       10  
Impaired Assets              
Derivative [Line Items]              
Number of assets impaired | engine           2  
Interest rate contract              
Derivative [Line Items]              
Net fair value of swap asset (liability) $ 2,400,000   $ 2,400,000 $ 2,400,000 $ 2,400,000   $ (4,000,000)
Fair value of interest rate swap, asset 4,200,000   4,200,000 4,200,000 4,200,000    
Fair value of interest rate swap, liability 1,800,000   1,800,000 $ 1,800,000 $ 1,800,000    
Interest expense $ 500,000 $ 700,000 $ 1,900,000     $ 1,300,000