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Schedule of Gain on Disposition of Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014 Vessel	Mar. 31, 2013 Vessel	Mar. 31, 2012 Vessel
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on asset dispositions, net	$ 2,363	$ 7,170	$ 49	$ 2,140	$ 3,839	$ 99	$ 1,833	$ 838	$ 11,722	$ 6,609	$ 17,657
Number of vessels disposed									48	32	60
Vessels
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Gain on asset dispositions, net									$ 12,247	$ 12,191	$ 20,024

X

- Definition

Number of Vessels Sold or Scrapped

+ References

No definition available.

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X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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