Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 158,724	$ 162,028
Accumulated depreciation and amortization	(146,883)	(147,873)
Total seismic equipment lease pool and property and equipment, net	11,841	14,155
Seismic equipment lease pool
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	143,894	147,519
Land and buildings
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	4,055	4,041
Furniture and fixtures
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	10,205	9,897
Autos and trucks
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 570	$ 571

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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