Supplemental Statements of Cash Flows Information - Supplemental Disclosures of Cash Flows Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 860us-gaap_InterestPaid	$ 342us-gaap_InterestPaid	$ 533us-gaap_InterestPaid
Income taxes paid, net	268us-gaap_IncomeTaxesPaid	215us-gaap_IncomeTaxesPaid	9,177us-gaap_IncomeTaxesPaid
Seismic equipment purchases included in accounts payable at year-end	72	7,707	4,268
Stock issued for accrued compensation			$ 516

Carrying value as of the balance sheet date of liabilities incurred and payable to vendors for seismic equipment purchases that are used in an entity's business.

No definition available.

+ Details

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- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP) for accrued compensation.

+ References

No definition available.

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

The amount of cash paid for interest during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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