Segment Reporting - Financial Information by Business Segment (Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 207,228	$ 205,419
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Total Assets	173,702	183,911
Operating Segments [Member] | Seamap [Member]
Segment Reporting Information [Line Items]
Total Assets	33,882	21,814
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ (356)	$ (306)