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Concentrations - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2018 USD ($) Customer Supplier | Jan. 31, 2017 USD ($) Customer
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |
Minimum rate of consolidated accounts receivable | 10.00% | 10.00%
Foreign bank deposits | $ 3.9 |
Number of suppliers manufacture land based seismic systems and equipment in use | Supplier | 2 |
Credit Risk |  |
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |
Aggregate amount of accounts receivable from customers | $ 5.8 | $ 5.1
Concentration risk number of customer | Customer | 3 | 3

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