Balance Sheet - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jan. 31, 2016
Seismic equipment lease pool and property and equipment:
Cost of seismic equipment lease pool and property and equipment	$ 249,312	$ 244,397
Accumulated depreciation and amortization	(180,718)	(170,881)
Total seismic equipment lease pool and property and equipment, net	68,594	73,516
Seismic Equipment Lease Pool [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	235,404	230,923
Land and Buildings [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	3,375	3,375
Furniture and Fixtures [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	9,835	9,405
Autos and Trucks [Member]
Seismic equipment lease pool and property and equipment:
Cost of property and equipment	$ 698	$ 694