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Long-Term Debt and Notes Payable - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 02, 2013 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jan. 31, 2017 SGD | Aug. 22, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit agreement collateralized by percentage of own capital stock |  |  | 65.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate of borrowings |  |  | 2.75% |  |  |
Credit Agreement [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings under the revolving credit facility | $ 50,000,000 | $ 50,000,000 |  |  |  |
Revolving credit facility expiration period | 3 years |  |  |  |  |
Remaining borrowings under the revolving credit facility |  |  | $ 10,000,000 |  |  |
Credit Agreement [Member] | Base Rate [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit Agreement basis points |  |  | 2.50% |  |  |
Credit Agreement [Member] | Eurodollar [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit Agreement basis points |  |  | 3.50% |  |  |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee on the unused portion of the Credit Agreement |  |  | 0.375% |  |  |
Fixed charge coverage ratio |  |  | 1.25% |  | 1.25% |
Adjusted EBITDA |  |  | $ 22,000,000 |  |  |
Capital expenditures to adjusted EBITDA |  |  | 1.0 |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |
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 |  |  |
Leverage Ratio |  |  | 2.00 |  |  |
Fixed charge coverage ratio |  |  | 1.25% |  | 1.25% |
Additional indebtedness |  |  | $ 5,000,000 |  |  |
Seamap Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings under the revolving credit facility |  |  |  |  |  | $ 15,000,000
Minimum shareholder's equity | SGD |  |  |  |  | SGD 15,000,000 |
Seamap Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Minimum ratio of debt to EBITDA |  |  | 125.00% |  |  |
Term Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Carrying value of debt |  |  |  |  |  | 10,000,000
Frequency of periodic payments |  |  | The term loan portion of the Seamap Credit Facility provided for eleven quarterly principal payments of $800,000 and a final payment of the remaining $1.2 million on or before August 22, 2017. |  |  |
Maturity period |  |  | Aug. 22, 2017 |  |  |
Principal payment of term loan portion |  |  | $ 800,000 |  |  |
Final payment of term portion |  |  | $ 1,200,000 |  |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit Agreement basis points |  |  | 2.75% |  |  |
Term Loan [Member] | Seamap Singapore [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings under the revolving credit facility |  |  | $ 3,000,000 |  |  |
Term Loan [Member] | Minimum [Member] | Seamap Singapore [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing period |  |  | 1 month |  |  |
Term Loan [Member] | Maximum [Member] | Seamap Singapore [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowing period |  |  | 3 months |  |  |
Singapore Credit Facility Bankers Guarantees [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Carrying value of debt |  |  |  |  |  | 2,000,000
Third Amendment [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings under the revolving credit facility |  | $ 40,000,000 |  |  |  |
Maturity of the credit agreement |  | Aug. 31, 2017 |  |  |  |
Revolving Credit Facility [Member] | Term Loan [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Borrowings under the revolving credit facility |  |  |  |  |  | $ 3,000,000
Seamap Credit Facility [Member] | Credit Agreement [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Average borrowings under the revolving credit facility |  |  | $ 12,200,000 | $ 17,600,000 |  |

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