Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 7,554	$ 19,545	$ 24,696	$ 45,277
Operating (loss) income	(8,804)	(3,996)	(9,761)	776
(Loss) income before taxes	(8,645)	(4,023)	(9,037)	823
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	5,321	11,836	17,397	31,508
Operating (loss) income	(7,988)	(4,827)	(8,869)	(1,549)
(Loss) income before taxes	(7,940)	(4,755)	(8,119)	(1,232)
Operating Segments [Member] | Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	2,273	8,008	7,388	14,205
Operating (loss) income	(853)	990	(962)	2,490
(Loss) income before taxes	(742)	891	(988)	2,220
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(40)	(299)	(89)	(436)
Operating (loss) income	37	(159)	70	(165)
(Loss) income before taxes	$ 37	$ (159)	$ 70	$ (165)