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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
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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 |

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