Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 174,198	$ 188,598
Accumulated depreciation and amortization	(157,543)	(165,698)
Total seismic equipment lease pool and property and equipment, net	16,655	22,900
Seismic equipment lease pool
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	159,312	174,274
Land and buildings
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	4,021	3,380
Furniture and fixtures
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	10,103	10,222
Autos and trucks
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 762	$ 722

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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