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

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