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Balance Sheet (Details 2) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment, gross	$ 249,344	$ 251,408
Accumulated depreciation and amortization	(137,515)	(131,800)
Total seismic equipment lease pool and property and equipment, net	111,829	119,608
Seismic equipment lease pool [Member]
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool	239,233	241,395
Land and buildings [Member]
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment, gross	366	366
Furniture and fixtures [Member]
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment, gross	8,999	8,899
Autos and trucks [Member]
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool and property and equipment, gross	$ 746	$ 748

X

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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-Publisher SEC

-Name Regulation S-X (SX)

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X

- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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X

- Definition

The gross amount of lessor property subject to or available for lease as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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