Segment Reporting - Financial Information by Business Segment (Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 209,192	$ 205,419
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Total Assets	172,881	183,911
Seamap [Member]
Segment Reporting Information [Line Items]
Total Assets	36,726	21,814
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ (415)	$ (306)