Seismic Equipment Lease Pool and Property and Equipment - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Cost of property and equipment	$ 15,365	$ 14,509
Cost of seismic equipment lease pool and property and equipment	160,499	162,028
Less accumulated depreciation	(146,722)	(147,873)
Net book value of seismic equipment lease pool and property and equipment	13,777	14,155	$ 22,900
Recording channels
Property, Plant and Equipment [Line Items]
Cost of property and equipment	80,378	84,207
Other peripheral equipment
Property, Plant and Equipment [Line Items]
Cost of property and equipment	64,756	63,312
Cost of seismic equipment lease pool
Property, Plant and Equipment [Line Items]
Cost of property and equipment	145,134	147,519
Land and buildings
Property, Plant and Equipment [Line Items]
Cost of property and equipment	4,274	4,041
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Cost of property and equipment	10,530	9,897
Autos and trucks
Property, Plant and Equipment [Line Items]
Cost of property and equipment	$ 561	$ 571