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Commitments And Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Commitments and Contingencies Disclosure [Line Items]
Purchase contract units, containers	2,100
Total costs of purchasing containers	$ 24.1

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- Details

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- Definition

Purchase contract units, containers

+ References

No definition available.

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- Definition

Total Cost Of Purchasing The Container

+ References

No definition available.

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