Sale/ Leaseback Arrangements - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
Sep. 30, 2014 Vessel	Jun. 30, 2014 Vessel	Sep. 30, 2014	Sep. 30, 2013
Sale Leaseback Transaction [Line Items]
Number of vessels sold	1	1
Proceeds from sale	$ 19,400,000	$ 13,400,000	$ 32,751,000	$ 65,550,000
Deferred gain	11,200,000	9,400,000	11,200,000
Carrying value	$ 8,200,000	$ 4,000,000	$ 8,200,000
Reacquisition percentage of original sales price	47.00%	61.00%
Length of extension period, months	24 months	24 months
Agreement during the first quarter of fiscal 2015
Sale Leaseback Transaction [Line Items]
Lease expiration date			Quarter ending June 2021
Agreement during the second quarter of fiscal 2015
Sale Leaseback Transaction [Line Items]
Lease expiration date			Quarter ending March 2023

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- Definition

Sale Leaseback Transaction, Expiration Date

+ References

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- Definition

Sale Leaseback Transaction, Number of Vessels

+ References

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- Definition

Sale Leaseback Transaction, Percentage of Sales Price to Reacquire

+ References

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- Definition

The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 25

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750

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- Definition

Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

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- Definition

The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller.

+ References

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