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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, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
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Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | $ 129,573 | $ 119,608 | $ 120,377
United States [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 42,087 | 40,908 |
Canada [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 35,931 | 22,639 |
Latin America [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 18,128 | 23,109 |
Australia [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 7,198 | 7,973 |
Russia [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 2,134 | 3,708 |
Singapore [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 6,451 | 9,433 |
United Kingdom [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 218 | 329 |
Europe [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | $ 17,426 | $ 11,509 |

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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