Seismic Equipment Lease Pool and Property and Equipment - Location of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 14,155	$ 22,900	$ 43,838
United States
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	1,566	4,973
Europe
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	5,564	6,557
Canada
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	93	2,134
Latin America
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	1,365	2,390
Singapore
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	4,496	4,793
Malaysia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	1,071	0
Australia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	0	737
Russia
Geographic Information For Property Plant And Equipment [Line Items]
Net book value of seismic equipment lease pool and property and equipment	$ 0	$ 1,316