Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Seismic equipment lease pool and property and equipment:
Cost of seismic equipment lease pool and property and equipment	$ 259,897	$ 253,698
Accumulated depreciation and amortization	(164,128)	(153,611)
Total seismic equipment lease pool and property and equipment, net	95,769us-gaap_PropertyPlantAndEquipmentNet	100,087us-gaap_PropertyPlantAndEquipmentNet
Seismic Equipment Lease Pool [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	249,236	243,211
Land and Buildings [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	366	366
Furniture and Fixtures [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	9,563	9,399
Autos and Trucks [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	$ 732	$ 722

Property plant and equipment including cost of seismic equipment gross.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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