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Debt Parenthetical (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 Senior unsecured notes [Member] Variable Rate Senior Unsecured Convertible Notes [Member] | Jun. 30, 2012 Senior unsecured notes [Member] Variable Rate Senior Unsecured Convertible Notes [Member] | Jun. 30, 2011 Senior unsecured notes [Member] Variable Rate Senior Unsecured Convertible Notes [Member] | Apr. 05, 2007 Senior unsecured notes [Member] Variable Rate Senior Unsecured Convertible Notes [Member] | Jun. 30, 2012 Revolving Credit Facility [Member] Food Packaging Segment [Member] Secured Debt [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] Food Packaging Segment [Member] Secured Debt [Member] | Jun. 30, 2012 Line of Credit [Member] Food Packaging Segment [Member] Unsecured Debt [Member] | Dec. 31, 2011 Line of Credit [Member] Food Packaging Segment [Member] Unsecured Debt [Member] | Jun. 30, 2012 Letter of Credit [Member] Food Packaging Segment [Member] Secured Debt [Member] | Dec. 31, 2011 Letter of Credit [Member] Food Packaging Segment [Member] Secured Debt [Member] | Jun. 30, 2012 Letter of Credit [Member] Automotive Segment [Member] Debt Facility [Member] | Dec. 31, 2011 Letter of Credit [Member] Automotive Segment [Member] Debt Facility [Member] | Jun. 30, 2012 Term Loan [Member] Gaming Segment [Member] Secured Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate notes, distribution amount | $ 0 | $ 0 | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding borowings |  |  |  |  | 0 | 0 | 0 | 0 |  |  | 40,000,000 | 38,000,000 |
Basis points spread on debt |  |  |  | 1.25% | 2.00% |  |  |  |  |  |  |  |
Trailing months used to calculate ratio of indebtedness to net capital |  |  |  |  |  |  |  |  |  |  |  |  | 12 years
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |

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- Definition Debt Instrument, Distribution Amount + References No definition available. + Details
Name: | iep_DebtInstrumentDistributionAmount
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Trailing Months Used to Calculate Leverage Ratios + References No definition available. + Details
Name: | iep_TrailingMonthsUsedToCalculateLeverageRatios
Namespace Prefix: | iep_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant