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Balance Sheet - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended	9 Months Ended		0 Months Ended				0 Months Ended
Balance Sheet - Additional Information (Detail) (USD $)	Oct. 31, 2014 Customer	Jan. 31, 2014 Customer	Oct. 31, 2014 Minimum [Member]	Oct. 31, 2014 Maximum [Member]	May 31, 2014 Seamap Pte Ltd [Member] Ion Geophysical Corporation [Member] Product_Lines	Oct. 31, 2014 Contracts Receivable [Member]	Jan. 31, 2014 Contracts Receivable [Member]	Oct. 31, 2014 Promissory Note [Member]	May 31, 2014 Inventory [Member] Seamap Pte Ltd [Member] Ion Geophysical Corporation [Member]
Balance Sheet [Line Items]
Contracts and notes receivable	$ 3,338,000	$ 1,005,000				$ 849,000	$ 1,005,000	$ 2,800,000
Contracts and notes receivable, Interest rate	2.10%	2.10%
Number of customers due	2	3
Contracts and notes receivable repayment term			1 month	13 months
Allowance for contract and notes receivable	0	0
Business acquisition, fair value consideration					$ 15,600,000				$ 3,600,000
Number of product lines					2

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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