Segment Reporting - Financial Information by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Fixed assets, net	$ 100,087				$ 129,573				$ 100,087	$ 129,573	$ 119,608
Intangible assets, net	10,831				3,201				10,831	3,201	3,989
Goodwill	5,594				4,320				5,594	4,320	4,320
Total Assets	179,611				205,419				179,611	205,419	190,407
Revenues	14,963	22,906	19,545	25,732	23,647	20,275	20,895	27,291	83,146	92,108	104,685
Interest income (expense), net									(673)	(10)	11
Income before taxes									(10,186)	6,026	13,524
Capital expenditures									34,400	44,058	45,659
Depreciation and amortization expense									36,986	31,037	34,939
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Fixed assets, net	98,964				128,847				98,964	128,847	118,801
Intangible assets, net	1,006				1,529				1,006	1,529	2,111
Total Assets	148,985				183,911				148,985	183,911	171,971
Revenues									59,830	67,022	73,516
Interest income (expense), net									(549)	(12)	11
Income before taxes									(12,373)	1,087	2,865
Capital expenditures									15,874	43,663	45,181
Depreciation and amortization expense									35,472	30,353	34,320
Seamap [Member]
Segment Reporting Information [Line Items]
Fixed assets, net	1,123				726				1,123	726	807
Intangible assets, net	9,825				1,672				9,825	1,672	1,878
Goodwill	5,594				4,320				5,594	4,320	4,320
Total Assets	30,982				21,814				30,982	21,814	18,578
Revenues									23,805	25,252	32,210
Interest income (expense), net									(124)	2
Income before taxes									2,271	4,720	10,835
Capital expenditures									18,526	395	478
Depreciation and amortization expense									$ 1,514	$ 684	$ 619