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Commitments and Contingencies (Venezuelan Operations) - Additional Information (Detail)	1 Months Ended
	May 31, 2009 Venezuelan National Oil Company Vessel	Jul. 31, 2009 Petrosucre S Vessel
Commitments and Contingencies Disclosure [Line Items]
Number of vessels seized	11	4

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- Definition

Number of vessels seized.

+ References

No definition available.

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