Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 183,971	$ 188,598
Accumulated depreciation and amortization	(164,206)	(165,698)
Total seismic equipment lease pool and property and equipment, net	19,765	22,900
Seismic equipment lease pool
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	168,646	174,274
Land and buildings
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	3,381	3,380
Furniture and fixtures
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	11,166	10,222
Autos and trucks
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment	$ 778	$ 722