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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended			1 Months Ended		3 Months Ended
	Apr. 30, 2014 Containers	Mar. 31, 2014 Vehicle	Dec. 31, 2013	Sep. 30, 2014 Containers	Apr. 30, 2014 Maximum [Member] Containers	Oct. 16, 2014 Subsequent Event [Member] Vehicle Containers	Dec. 31, 2013 Purchase Option Exercised [Member] Containers
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of containers to be purchased at lease expiration date							2,000
Cost of purchasing containers	$ 38.3		$ 0.3				$ 7.8
Leases expiry date							2014
Number of containers purchased				1,925
Number of remaining containers				75
Purchase contract units, tractors		300
Total costs of purchasing tractors		$ 39.3
Number of tractors received						216
Purchase contract units, containers	3,500				4,000
Number of containers received						2,694