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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]      
Undistributed earnings of non-U.S. subsidiaries $ 683,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries $ 597,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Foreign earnings repatriated 6,500,000us-gaap_ForeignEarningsRepatriated 11,700,000us-gaap_ForeignEarningsRepatriated 0us-gaap_ForeignEarningsRepatriated
Incremental income tax expense 200,000iex_ForeignEarningsRepatriatedIncomeTaxExpenseBenefit 900,000iex_ForeignEarningsRepatriatedIncomeTaxExpenseBenefit  
Accrued interest related to uncertain tax positions 700,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 500,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 700,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Accrued penalties related to uncertain tax positions 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued
Unrecognized tax benefits that would affect our effective tax rate 2,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 4,500,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 5,800,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized tax benefits possible change, estimated range, lower bound 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Unrecognized tax benefits possible change, estimated range, upper bound 2,100,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Loss carry forwards for U.S. federal 7,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 9,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Loss carry forwards for non-U.S. 5,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 7,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign  
Loss carry forwards, subject to expiration amount 1,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration    
Loss carry forwards, not subject to expiration amount 2,200,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration    
Foreign capital loss carry forward 1,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 1,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Deferred tax assets, capital loss carry forwards 200,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 200,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Operating loss and credit carry forwards 23,700,000us-gaap_OperatingLossCarryforwards 22,400,000us-gaap_OperatingLossCarryforwards  
Operating loss carry forwards, valuation allowance $ 800,000us-gaap_OperatingLossCarryforwardsValuationAllowance $ 700,000us-gaap_OperatingLossCarryforwardsValuationAllowance  
Federal | Minimum      
Income Tax Disclosure [Line Items]      
Operating loss carry forwards, expiration dates Dec. 31, 2018    
Federal | Maximum      
Income Tax Disclosure [Line Items]      
Operating loss carry forwards, expiration dates Dec. 31, 2031    
State and Local Jurisdiction | Minimum      
Income Tax Disclosure [Line Items]      
Operating loss carry forwards, expiration dates Dec. 31, 2022    
State and Local Jurisdiction | Maximum      
Income Tax Disclosure [Line Items]      
Operating loss carry forwards, expiration dates Dec. 31, 2034