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Insurance Receivable and Impairment - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Leases Disclosure [Line Items]                
Containers, net book value   $ 4,693,533,000     $ 4,693,533,000   $ 4,125,052,000  
Bad debt expense   (15,000)   $ (2,095,000) $ (1,225,000) $ (326,000)    
Previously Insolvent Customer                
Leases Disclosure [Line Items]                
Container loss recovery     $ 7,986,000          
Insurance receivable associated with this insolvent customer             2,106,000  
Previously Insolvent Customer | China, Yuan Renminbi                
Leases Disclosure [Line Items]                
Bankruptcy settlement amount received in cash $ 77,000              
Bankruptcy settlement amount received in stock value $ 5,789,000              
Insolvent Customer                
Leases Disclosure [Line Items]                
Insurance receivable associated with this insolvent customer               $ 0
Bad debt expense             $ 378,000  
Gain on container recovery   $ 176,000 7,577,000 $ 1,525,000        
Insolvent Customer | Owned Containers                
Leases Disclosure [Line Items]                
Containers, net book value     10,538,000          
Insolvent Customer | Container Unrecoverable in Lessees Insolvency                
Leases Disclosure [Line Items]                
Asset impairment charges     $ 1,581,000