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Long-Term Debt and Notes Payable - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) payment | Jan. 31, 2017 USD ($) | Nov. 30, 2016 USD ($) | Oct. 31, 2016 USD ($) | Aug. 22, 2014 USD ($)
London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate of borrowings | 3.00% |  |  |  |
Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowings under the revolving credit facility |  |  | $ 10,000,000 | $ 20,000,000 |
Credit Agreement | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee on the unused portion of the Credit Agreement |  | 0.375% |  |  |
Credit Agreement | Minimum | Eurodollar |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit Agreement basis points |  | 2.50% |  |  |
Credit Agreement | Minimum | ABR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage Ratio |  | 0.015 |  |  |
Credit Agreement | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee on the unused portion of the Credit Agreement |  | 0.50% |  |  |
Available borrowings under the revolving credit facility to secure letters of credit |  |  | $ 10,000,000 |  |
Credit Agreement | Maximum | Eurodollar |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit Agreement basis points |  | 3.50% |  |  |
Credit Agreement | Maximum | ABR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage Ratio |  | 0.025 |  |  |
Seamap Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowings under the revolving credit facility |  |  |  |  | $ 15,000,000
Term Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity period | Aug. 31, 2017 |  |  |  |
Carrying value of debt |  |  |  |  | 10,000,000
Number of periodic quarterly payments | payment | 11 |  |  |  |
Principal payment of term loan portion | $ 800,000 |  |  |  |
Final payment of term portion | $ 1,200,000 |  |  |  |
Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit Agreement basis points | 2.75% |  |  |  |
Term Loan | Seamap Singapore |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowings under the revolving credit facility | $ 3,000,000 |  |  |  |
Term Loan | Minimum | Seamap Singapore |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing period | 1 month |  |  |  |
Term Loan | Maximum | Seamap Singapore |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing period | 3 months |  |  |  |
Singapore Credit Facility Bankers Guarantees |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Carrying value of debt |  |  |  |  | 2,000,000
Revolving line of credit | Term Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowings under the revolving credit facility |  |  |  |  | $ 3,000,000
Seamap Credit Facility | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Average borrowings under the revolving credit facility | $ 801,000 | $ 12,200,000 |  |  |

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