Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Seismic equipment lease pool and property and equipment:
Cost of seismic equipment lease pool and property and equipment	$ 199,289	$ 232,517
Accumulated depreciation and amortization	(172,917)	(188,679)
Total seismic equipment lease pool and property and equipment, net	26,372	43,838
Seismic Equipment Lease Pool [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	185,304	219,001
Land and Buildings [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	3,380	3,379
Furniture and Fixtures [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	9,904	9,462
Autos and Trucks [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	$ 701	$ 675