Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 17,142us-gaap_Revenues	$ 25,732us-gaap_Revenues
Operating (loss) income	(957)us-gaap_OperatingIncomeLoss	4,772us-gaap_OperatingIncomeLoss
(Loss) income before taxes	(392)	4,846
Operating Segments [Member] \| Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	12,076	19,672
Operating (loss) income	(881)	3,278
(Loss) income before taxes	(179)	3,523
Operating Segments [Member] \| Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	5,115	6,197
Operating (loss) income	(109)	1,500
(Loss) income before taxes	(246)	1,329
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(49)	(137)
Operating (loss) income	33	(6)
(Loss) income before taxes	$ 33	$ (6)

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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