XML 42 R27.htm IDEA: XBRL DOCUMENT v2.4.0.8
Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2014
Containers
Jun. 30, 2014
Containers
Apr. 30, 2014
Maximum [Member]
Containers
Mar. 31, 2014
Purchase Contract [Member]
Vehicle
Dec. 31, 2013
Purchase Option Exercised [Member]
Containers
Jun. 30, 2014
Purchase Option Exercised [Member]
Containers
Jun. 30, 2014
Purchase Option Exercised [Member]
Scenario, Forecast [Member]
Containers
Purchase Commitment, Excluding Long-term Commitment [Line Items]              
Number of containers to be purchased at lease expiration date         2,000 1,750 250
Cost of purchasing containers $ 38.3       $ 7.8 $ 0.9  
Leases expiry date         2014    
Purchase contract units, tractors       300      
Total costs of purchasing tractors       $ 39.3      
Purchase contract units, containers 3,500 418 4,000