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Segment Reporting - Reconciliation of Income (Loss) Before Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before taxes |  |  |  |  |  |  |  |  | $ 6,026 | $ 13,524 | $ 34,330
Reconciling items: |  |  |  |  |  |  |  |  |  |  |
Consolidated income before taxes | 2,179 | (3,106) | (966) | 7,919 | 3,365 | (2,178) | 1,274 | 11,063 | 6,026 | 13,524 | 34,330
Equipment Leasing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before taxes |  |  |  |  |  |  |  |  | 1,087 | 2,865 | 24,081
Seamap [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before taxes |  |  |  |  |  |  |  |  | 4,720 | 10,835 | 10,195
Intersegment Sales Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |
Consolidated income before taxes |  |  |  |  |  |  |  |  | $ 219 | $ (176) | $ 54

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References 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 + Details
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