Seismic Equipment Lease Pool and Property and Equipment - Location of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	$ 43,838	$ 73,516	$ 100,087
United States [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	16,510	26,913
Canada [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	8,525	13,985
Latin America [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	2,317	3,074
Australia [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	1,462	2,611
Russia [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	1,973	2,026
Singapore [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	5,321	6,408
Europe [Member]
Geographic Information For Property Plant And Equipment [Line Items]
Seismic equipment lease pool and property and equipment, net	$ 7,730	$ 18,499