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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Commitments [Member]
Jun. 30, 2013
Purchase Contract [Member]
Jun. 30, 2013
Purchase Option Exercised [Member]
Dec. 31, 2012
Purchase Option Exercised [Member]
Sep. 30, 2013
Purchase Option Exercised [Member]
Commitments and Contingencies Disclosure [Line Items]                    
Purchase contract units, containers     4,029              
Total costs of purchasing containers             $ 45,700,000      
Number of containers delivered       3,258            
Number of containers outstanding       771            
Accrued liabilities for container purchase           11,300,000        
Liabilities current           25,800,000        
Number of containers to be purchased at lease expiration date               200 4,000  
Total price of containers to be purchased at lease expiration date                 14,800,000  
Leases expiry date                 2013  
Number of containers purchased                   3,193
Cost of purchasing containers $ 26,877,000 $ 13,628,000   $ 66,079,000 $ 34,671,000         $ 11,400,000