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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
Dec. 31, 2012
Purchase Option Exercised [Member]
Mar. 19, 2013
Purchase Contract [Member]
Mar. 18, 2013
Purchase Contract [Member]
Tractors [Member]
Vehicle
Commitments and Contingencies Disclosure [Line Items]      
Purchase contract units, containers   2,529  
Total costs of purchasing containers $ 15.0 $ 29.0  
Number of tractors acquired     80
Total costs of purchasing containers     $ 9.1
Number of containers to be purchased at lease expiration date 4,000    
Leases expiry date 2013