Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 143,823	$ 160,499
Accumulated depreciation and amortization	(131,821)	(146,722)
Total seismic equipment lease pool and property and equipment, net	12,002	13,777
Seismic equipment lease pool
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	128,418	145,134
Land and buildings
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	4,301	4,274
Furniture and fixtures
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	10,547	10,530
Autos and trucks
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 557	$ 561

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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