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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, 2015 | Jan. 31, 2014 | Jan. 31, 2013
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Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | $ 100,087 us-gaap_PropertyPlantAndEquipmentNet | $ 129,573 us-gaap_PropertyPlantAndEquipmentNet | $ 119,608 us-gaap_PropertyPlantAndEquipmentNet
United States [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 43,541 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 42,087 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |
Canada [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 22,451 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA | 35,931 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA |
Latin America [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 7,519 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_LatinAmericaMember | 18,128 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_LatinAmericaMember |
Australia [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 4,600 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | 7,198 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU |
Russia [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 2,698 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_RU | 2,134 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_RU |
Singapore [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 6,627 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_SG | 6,451 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_SG |
United Kingdom [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | 125 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB | 218 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB |
Europe [Member] |  |  |
Geographic Information For Property Plant And Equipment [Line Items] |  |  |
Seismic equipment lease pool and property and equipment, net | $ 12,526 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | $ 17,426 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |

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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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