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Schedule of Vessel Commitments (Parenthetical) (Detail)	6 Months Ended
	Sep. 30, 2015 Vessel
Option Agreement
Significant Purchase and Supply Commitment [Line Items]
Number of vessels under construction	7

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- Definition

Significant Commitments, New Construction

+ References

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- Definition

Significant Purchase and Supply Commitment [Line Items]

+ References

No definition available.

+ Details

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- Details

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