Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 22,906	$ 20,275	$ 68,183	$ 68,461
Operating (loss) income	194	(2,552)	970	3,505
(Loss) income before taxes	(340)	(3,106)	483	3,847
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	17,115	14,738	48,623	52,039
Operating (loss) income	(188)	(3,398)	(1,737)	1,332
(Loss) income before taxes	(1,071)	(3,733)	(2,303)	1,598
Operating Segments [Member] | Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	5,827	5,608	20,032	16,584
Operating (loss) income	337	804	2,827	2,038
(Loss) income before taxes	686	585	2,906	2,114
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(36)	(71)	(472)	(162)
Operating (loss) income	45	42	(120)	135
(Loss) income before taxes	$ 45	$ 42	$ (120)	$ 135