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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Commitments and Contingencies Disclosure [Line Items]
Purchase contract units, containers	2,100
Total costs of purchasing containers	$ 24.1
Number of containers received	1,729
Number of containers to be received	371

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Number of Containers Received

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Number of Containers to Be Received

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Purchase contract units, containers

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