Seismic Equipment Lease Pool and Property and Equipment - Location of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 13,777	$ 14,155	$ 22,900
United States
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	5,400	1,566
Europe
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	4,110	5,564
Canada
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	1,136	93
Latin America
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	1,170	1,365
Singapore
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	773	4,496
Malaysia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 1,188	$ 1,071