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Sale/ Leaseback Arrangements - Additional Information (Detail) - Vessel	3 Months Ended							12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2015	Mar. 31, 2014
Leases [Abstract]
Number of vessels sold	1	3	1	1	4	4	2	6	10

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- Definition

Sale leaseback transaction, number of vessels.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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