Segment Reporting - Financial Information by Business Segment (Assets) (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Segment Reporting Information [Line Items]
Total Assets	$ 159,710	$ 179,611
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Total Assets	129,435	148,985
Operating Segments [Member] | Seamap [Member]
Segment Reporting Information [Line Items]
Total Assets	30,566	30,982
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ (291)	$ (356)