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Segment Reporting - Reconciliation of Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | $ (19,708) | $ (31,290) | $ (26,760)
Operating Segments | Marine Technology Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | (2,572) | (508) | 279
Operating Segments | Equipment Leasing |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | (13,930) | (27,782) | (23,454)
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | 5 | 1 | 117
Corporate expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | $ (3,211) | $ (3,001) | $ (3,702)

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