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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 $ 434,000us-gaap_AmortizationOfFinancingCosts $ 429,000us-gaap_AmortizationOfFinancingCosts  
Amount to be recognized from hedged transactions within 12 months, approximate 7,000,000us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred    
Interest Rate Exchange Agreement Expiring 2010 and 2011      
Derivative [Line Items]      
Amortization of interest expense     $ 68,900,000us-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     2us-gaap_DerivativeNumberOfInstrumentsHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember