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Investments - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
engine
aircraft.
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]    
Ownership interest 50.00%  
Net book value of equipment held for operating lease $ 31,753 $ 31,520
Assets Leased to Others    
Schedule of Equity Method Investments [Line Items]    
Net book value of equipment held for operating lease $ 1,886,613 1,650,918
WMES    
Schedule of Equity Method Investments [Line Items]    
Ownership interest 50.00%  
Number of engines in lease portfolio | engine 36  
Number of aircraft in lease portfolio | aircraft. 5  
WMES | Other Revenue    
Schedule of Equity Method Investments [Line Items]    
Management fees earned $ 1,600 $ 2,900
WMES | Assets Leased to Others    
Schedule of Equity Method Investments [Line Items]    
Net book value of equipment held for operating lease $ 289,200  
CASC Willis    
Schedule of Equity Method Investments [Line Items]    
Ownership interest 50.00%  
Number of engines in lease portfolio | engine 4  
CASC Willis | Assets Leased to Others    
Schedule of Equity Method Investments [Line Items]    
Net book value of equipment held for operating lease $ 50,100