Seismic Equipment Lease Pool and Property and Equipment - Location of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 22,900	$ 43,838	$ 73,516
United States
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	4,973	16,510
Europe
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	6,557	7,730
Canada
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	2,134	8,525
Latin America
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	2,390	2,317
Singapore
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	4,793	5,321
Australia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	737	1,462
Russia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 1,316	$ 1,973