Debt Instrument, Basis Spread on Variable Rate, Increase (Decrease)

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Required Liquidity, Maintained Any Business Day

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No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Required Liquidity, Maintained Five Consecutive Business Days

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No definition available.

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- Definition

Debt Instrument, Number Of Days Early Commitment Termination Date And Early Maturity Date, Eliminated By Amendment

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No definition available.

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- Definition

Debt Instrument, Number Of Days Prior To Stated Maturity Borrowing Capacity Reduced By Reserve

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No definition available.

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- Definition

Debt Instrument, Percentage Of Ownership Interest In Subsidiaries Subject To First Priority Security Interest

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No definition available.

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- Definition

Debt Instrument, Restrictive Covenants, Threshold For Liquidation, Value Of Multi-Client Data Library

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No definition available.

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- Definition

Fixed charge coverage ratio.

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No definition available.

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- Definition

Line Of Credit Facility, Covenant Terms, Maximum Amount Of Permitted Junior Debt

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No definition available.

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Period Type:	instant

- Definition

Line Of Credit Facility, Excess Availability To Borrow

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligations including current maturities.

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No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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Balance Type:	credit
Period Type:	duration

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- Details

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Long-term Debt - Narrative (Details)				3 Months Ended
Long-term Debt - Narrative (Details)	Mar. 26, 2018 USD ($)	Apr. 28, 2016 USD ($)	Apr. 27, 2016 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Cash and cash equivalents				$ 50,750,000	$ 52,056,000	$ 49,640,000
Aggregate principal amount of debt				117,930,000	$ 156,744,000
Domestic subsidiaries
Debt Instrument [Line Items]
Cash and cash equivalents				41,400,000
Non-domestic subsidiaries
Debt Instrument [Line Items]
Cash and cash equivalents				9,400,000
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC)
Debt Instrument [Line Items]
Maximum amount of certain indebtedness				$ 40,000,000
Increase in applicable margin due to amendment to Credit Facility		0.50%
Number of days prior to stated maturity borrowing capacity reduced by reserve				90 days
Maximum amount of certain permitted junior indebtedness		$ 200,000,000	$ 175,000,000
Number of days early commitment termination date and early maturity date, eliminated by amendment				90 days
Limit for multi-client liquidation component				$ 15,000,000.0
Current borrowing capacity				23,600,000
Indebtedness under the Credit Facility				0
Required liquidity maintained five consecutive business days				7,500,000.0
Required liquidity maintained any business day				6,500,000.0
Excess availability to borrow				$ 23,600,000
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC) \| Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio				1.1
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC) \| Subsidiary Issuer
Debt Instrument [Line Items]
Percentage of obligations secured by stock of Subsidiary Borrowers		100.00%
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC) \| ION International Holdings L.P.
Debt Instrument [Line Items]
Percentage of obligations secured by stock of Subsidiary Borrowers		65.00%
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC) \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate for debt		3.00%	2.50%
Line of credit \| Revolving credit facility \| PNC Bank, National Association (PNC) \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate for debt		4.00%	3.50%
Senior secured notes \| Senior secured third-priority lien notes (redeemed on March 26, 2018)
Debt Instrument [Line Items]
Stated rate on debt					8.125%
Aggregate principal amount of debt					$ 28,500,000
Amount of notes redeemed by paying principal amount	$ 28,500,000
Senior secured notes \| Senior secured second-priority lien notes (maturing December 15, 2021)
Debt Instrument [Line Items]
Stated rate on debt					9.125%
Aggregate principal amount of debt					$ 120,600,000