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

No definition available.

Name:	io_DebtInstrumentCovenantComplianceRequiredLiquidityMaintainedAnyBusinessDay
Namespace Prefix:	io_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	io_DebtInstrumentCovenantComplianceRequiredLiquidityMaintainedFiveConsecutiveBusinessDays
Namespace Prefix:	io_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Qualified Cash Component, Maximum To Be Removed

+ References

No definition available.

+ Details

Name:	io_DebtInstrumentQualifiedCashComponentMaximumToBeRemoved
Namespace Prefix:	io_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	io_DebtInstrumentRestrictiveCovenantsThresholdForLiquidationValueOfMultiClientDataLibrary
Namespace Prefix:	io_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	io_FixedChargeCoverageRatio
Namespace Prefix:	io_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=io_PNCBankNationalAssociationPNCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term Debt - Narrative (Details)	Aug. 04, 2015 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2014 USD ($)	May. 31, 2013 USD ($)	May. 13, 2013 USD ($)
Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of debt				$ 175,000,000	$ 175,000,000
Stated rate on debt				8.125%
Line of Credit [Member] \| PNC Bank, National Association (PNC) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.1
Line of Credit [Member] \| Revolving line of credit [Member] \| PNC Bank, National Association (PNC) [Member]
Debt Instrument [Line Items]
Current borrowing capacity	$ 40,000,000	$ 40,000,000	$ 80,000,000
Limit for multi-client liquidation component	15,000,000.0
Qualified cash component, maximum to be removed	20,000,000.0
Debt Instrument, Covenant Compliance, Required Liquidity, Maintained Five Consecutive Business Days	5,000,000
Debt Instrument, Covenant Compliance, Required Liquidity, Maintained Any Business Day	$ 4,000,000