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