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Derivative Instruments (Additional Information) (Detail) (USD $) | 3 Months Ended | 24 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2011
Derivative [Line Items] |  |  |
Amortization of interest expense | $ 434,000 us-gaap_AmortizationOfFinancingCosts | $ 429,000 us-gaap_AmortizationOfFinancingCosts |
Amount to be recognized from hedged transactions within 12 months, approximate | 7,000,000 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred |  |
Interest Rate Exchange Agreement Expiring 2010 and 2011 |  |  |
Derivative [Line Items] |  |  |
Amortization of interest expense |  |  | $ 68,900,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DerivativeByNatureAxis = iex_InterestRateExchangeAgreementExpiringTwoThousandTenandElevenMember
Term of amortized interest expense, years |  |  | 10 years
4.5% Senior Notes, due December 2020 |  |  |
Derivative [Line Items] |  |  |
Interest rate on senior notes | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = iex_FourPointFivePercentageSeniorNotesMember |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = iex_FourPointFivePercentageSeniorNotesMember
4.2% Senior Notes, due December 2021 |  |  |
Derivative [Line Items] |  |  |
Interest rate on senior notes | 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = iex_FourPointTwoPercentageSeniorNotesMember |  | 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = iex_FourPointTwoPercentageSeniorNotesMember
Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Number of instruments held |  |  | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 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 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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