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