Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 20,275	$ 18,573	$ 68,461	$ 76,284
Operating (loss) income	(2,552)	(1,862)	3,505	11,145
(Loss) Income before taxes	(3,106)	(2,178)	3,847	10,159
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	14,738	14,078	52,039	53,983
Operating (loss) income	(3,398)	(2,760)	1,332	2,954
(Loss) Income before taxes	(3,733)	(2,714)	1,598	2,378
Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	5,608	4,839	16,584	23,134
Operating (loss) income	804	1,232	2,038	8,410
(Loss) Income before taxes	585	870	2,114	8,000
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(71)	(344)	(162)	(833)
Operating (loss) income	42	(334)	135	(219)
(Loss) Income before taxes	$ 42	$ (334)	$ 135	$ (219)