Segment Reporting - Financial Information by Business Segment (Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Segment Reporting Information [Line Items]
Total Assets	$ 188,572	$ 190,407
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Total Assets	168,343	171,971
Seamap [Member]
Segment Reporting Information [Line Items]
Total Assets	20,236	18,578
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Assets	$ (7)	$ (142)