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Restructuring and Other Charges - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 4 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]    
Crude oil, lowest prices, number of years evaluated 5 years  
Percentage reduction in full-time employee base   20.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent
Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected additional restructuring charges to incur 2us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 2us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected additional restructuring charges to incur 4us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Towed Streamer [Member] | Systems [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of locations 2io_NumberOfLocations
/ us-gaap_ProductOrServiceAxis
= io_TowedStreamerMember
/ us-gaap_StatementBusinessSegmentsAxis
= io_SystemsMember		 2io_NumberOfLocations
/ us-gaap_ProductOrServiceAxis
= io_TowedStreamerMember
/ us-gaap_StatementBusinessSegmentsAxis
= io_SystemsMember