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Summary of Significant Accounting Policies - Leasing Equipment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]                      
Net gain (loss) on sale of leasing equipment $ 4,857,000 $ 6,196,000 $ 7,519,000 $ 8,469,000 $ 7,999,000 $ 7,055,000 $ 11,105,000 $ 9,218,000 $ 27,041,000 $ 35,377,000 $ 35,812,000
Property Subject to or Available for Operating Lease, Net 8,392,547,000       8,923,451,000       8,392,547,000 8,923,451,000  
Property Available for Operating Lease, Net 721,700,000       551,100,000       $ 721,700,000 551,100,000  
Dry Container Units 20 Foot                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 13 years    
Residual values from date of manufacture 1,000               $ 1,000    
Dry Container Units 40 Foot [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 13 years    
Residual values from date of manufacture 1,200               $ 1,200    
Dry Container Units 40 Foot High Cube [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 13 years    
Residual values from date of manufacture 1,400               $ 1,400    
Refrigerated Container Units 20 Foot [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 12 years    
Residual values from date of manufacture         2,350         2,350  
Refrigerated Container Units 40 Foot High Cube [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 12 years    
Residual values from date of manufacture         3,350         $ 3,350  
Special Container Units 40 Foot Flat Rack [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                   16 years  
Residual values from date of manufacture         1,700         $ 1,700  
Special Container Units 40 Foot Open Top [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 16 years 16 years  
Residual values from date of manufacture 2,300               $ 2,300    
Dry container units                      
Property, Plant and Equipment [Line Items]                      
Property Subject to or Available for Operating Lease, Net 6,308,038,000       6,666,560,000       6,308,038,000 $ 6,666,560,000  
Refrigerated container units                      
Property, Plant and Equipment [Line Items]                      
Property Subject to or Available for Operating Lease, Net 1,520,747,000       1,676,331,000       1,520,747,000 1,676,331,000  
Special container units                      
Property, Plant and Equipment [Line Items]                      
Property Subject to or Available for Operating Lease, Net 321,099,000       322,607,000       $ 321,099,000 322,607,000  
Tank Container Units [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 20 years    
Residual values from date of manufacture 3,000               $ 3,000    
Property Subject to or Available for Operating Lease, Net 101,677,000       107,284,000       $ 101,677,000 107,284,000  
Chassis [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                 20 years    
Residual values from date of manufacture 1,200               $ 1,200    
Property Subject to or Available for Operating Lease, Net $ 140,986,000       150,669,000       140,986,000 150,669,000  
Long Lived Assets Held-for-sale, Name [Domain]                      
Property, Plant and Equipment [Line Items]                      
Net gain (loss) on sale of leasing equipment                 (5,299,000) (3,933,000) 3,000
Equipment, net of selling costs [Member]                      
Property, Plant and Equipment [Line Items]                      
Net gain (loss) on sale of leasing equipment                 $ 32,340,000 39,310,000 $ 35,809,000
Minimum [Member] | Refrigerated Container Units 20 Foot [Member]                      
Property, Plant and Equipment [Line Items]                      
Residual values from date of manufacture         2,250         2,250  
Minimum [Member] | Refrigerated Container Units 40 Foot High Cube [Member]                      
Property, Plant and Equipment [Line Items]                      
Residual values from date of manufacture         3,250         $ 3,250  
Minimum [Member] | Special Container Units 40 Foot Flat Rack [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                   12 years  
Residual values from date of manufacture         1,500         $ 1,500  
Minimum [Member] | Special Container Units 40 Foot Open Top [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                   12 years  
Residual values from date of manufacture         2,300         $ 2,300  
Maximum [Member] | Refrigerated Container Units 20 Foot [Member]                      
Property, Plant and Equipment [Line Items]                      
Residual values from date of manufacture         2,500         2,500  
Maximum [Member] | Refrigerated Container Units 40 Foot High Cube [Member]                      
Property, Plant and Equipment [Line Items]                      
Residual values from date of manufacture         3,500         $ 3,500  
Maximum [Member] | Special Container Units 40 Foot Flat Rack [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                   14 years  
Residual values from date of manufacture         3,000         $ 3,000  
Maximum [Member] | Special Container Units 40 Foot Open Top [Member]                      
Property, Plant and Equipment [Line Items]                      
Useful Lives                   14 years  
Residual values from date of manufacture         $ 2,500         $ 2,500