2.4.0.8100620 - Disclosure - Other Income (Loss), Net (Detail)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$C_0001085621_20130401_20130630http://www.sec.gov/CIK0001085621duration2013-04-01T00:00:002013-06-30T00:00:00U_iso4217USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$C_0001085621_20120401_20120630http://www.sec.gov/CIK0001085621duration2012-04-01T00:00:002012-06-30T00:00:00U_iso4217USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$C_0001085621_20130101_20130630http://www.sec.gov/CIK0001085621duration2013-01-01T00:00:002013-06-30T00:00:00U_iso4217USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$C_0001085621_20120101_20120630http://www.sec.gov/CIK0001085621duration2012-01-01T00:00:002012-06-30T00:00:00U_iso4217USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_ScheduleOfEquityMethodInvestmentsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule Of Equity Method Investments [Line Items]2false 4us-gaap_MarketableSecuritiesRealizedGainLossus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2300023USD$falsetruefalse2truefalsefalse14460001446USD$falsetruefalse3truefalsefalse2300023USD$falsetruefalse4truefalsefalse14460001446USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 false2Realized gains on sales of marketable securities3false 4icge_EquityMethodOrCostMethodInvestmentRealizedGainLossOnDisposalOwnershipInteresticge_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1200012falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse220000220falsefalsefalsexbrli:monetaryItemTypemonetaryEquity method investment or cost method investment realized gain loss on disposal ownership interest.No definition available.false2Gains on sales/distributions of ownership interests4false 4icge_OtherNonOperatingIncomeExpenseOthericge_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-68000-68falsefalsefalse2truefalsefalse1200012falsefalsefalse3truefalsefalse-126000-126falsefalsefalse4truefalsefalse-39000-39falsefalsefalsexbrli:monetaryItemTypemonetaryOther non operating income expense other.No definition available.false2Other5false 4icge_OtherNonOperatingIncomeLossOfParentEntityicge_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-45000-45falsefalsefalse2truefalsefalse14700001470falsefalsefalse3truefalsefalse-103000-103falsefalsefalse4truefalsefalse16270001627falsefalsefalsexbrli:monetaryItemTypemonetaryOther non operating income loss of parent entity.No definition available.true2Total other income (loss) for parent company6false 4icge_OtherNonOperatingIncomeLossOfConsolidatedCoreCompaniesicge_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse106000106falsefalsefalse2truefalsefalse-416000-416falsefalsefalse3truefalsefalse-809000-809falsefalsefalse4truefalsefalse-176000-176falsefalsefalsexbrli:monetaryItemTypemonetaryOther Non operating income loss of consolidated core companies.No definition available.false2Total other income (loss) for consolidated core companies7false 4us-gaap_OtherNonoperatingIncomeExpenseus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse6100061USD$falsetruefalse2truefalsefalse10540001054USD$falsetruefalse3truefalsefalse-912000-912USD$falsetruefalse4truefalsefalse14510001451USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 true2Other income (loss), netfalseOther Income (Loss), Net (Detail) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.icg.com/20130630/taxonomy/role/DisclosureOtherIncomeLossNetDetail47