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Summary of significant accounting policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Cash accounting $ (4,321,006) $ (4,682,266)  
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Allowance for credit loss $ 67,153 0  
Decrease to retained earnings (7,399,703) (7,734,609)  
Basic lease rents      
Summary Of Significant Accounting Policies [Line Items]      
Cash accounting (3,761,611) (4,281,260)  
Basic lease rents | Cash accounting      
Summary Of Significant Accounting Policies [Line Items]      
Cash accounting $ 310,600    
Cumulative effect due to adoption of new accounting standard      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for credit loss   $ 30,264 $ 30,300
Decrease to retained earnings     $ 25,800
Flight Equipment      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of asset, years 25 years    
Percentage of estimates for residual values of original manufacture cost 15.00%