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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items]        
Reporting unit, percentage of fair value in excess of carrying amount       15.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Amortization of intangible assets $ 43,187,000us-gaap_AmortizationOfIntangibleAssets $ 44,327,000us-gaap_AmortizationOfIntangibleAssets $ 41,485,000us-gaap_AmortizationOfIntangibleAssets  
Expected amortization expense, 2015 40,400,000iex_FiniteLivedIntangibleAssetsAmortizationExpenseYearOne      
Expected amortization expense, 2016 38,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
Expected amortization expense, 2017 29,800,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
Expected amortization expense, 2018 18,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
Expected amortization expense, 2019 $ 14,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
IOP [Member] | Banjo Trade Name        
Goodwill and Intangible Assets Disclosure [Line Items]        
Reporting unit, percentage of fair value in excess of carrying amount       40.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= iex_BanjoTradeNameMember
/ us-gaap_StatementBusinessSegmentsAxis
= iex_IOPMember