Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (55,516)us-gaap_ProfitLoss	$ 76,449us-gaap_ProfitLoss
Other comprehensive loss, net of taxes, as appropriate:
Foreign currency translation adjustments	(1,345)	486
Equity interest in investees' other comprehensive loss	0	(1,173)
Other changes in other comprehensive income	0	26
Total other comprehensive loss, net of taxes	(1,345)	(661)
Comprehensive net income (loss)	(56,861)	75,788
Comprehensive (income) loss attributable to noncontrolling interest	252	(470)
Comprehensive net income (loss) attributable to ION	$ (56,609)us-gaap_ComprehensiveIncomeNetOfTax	$ 75,318us-gaap_ComprehensiveIncomeNetOfTax

Other Comprehensive Income (Loss), Equity Method Investment

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Other Comprehensive Income (Loss), Other Changes in Net of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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