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Share-Based Compensation (Schedule of Compensation Cost for Stock Options, Unvested Shares and Performance Share Units) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | $ 6,882 us-gaap_ShareBasedCompensation | $ 6,312 us-gaap_ShareBasedCompensation
Stock Option |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 2,423 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 2,432 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Income tax benefit | (767)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (755)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Total expense after income taxes | 1,656 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,677 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Option | Cost Of Goods Sold |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 226 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 242 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Stock Option | Selling, General And Administrative Expenses |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 2,197 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 2,190 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Unvested Shares |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 3,117 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 3,218 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember
Income tax benefit | (806)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | (687)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember
Total expense after income taxes | 2,311 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 2,531 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember
Unvested Shares | Cost Of Goods Sold |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 420 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 472 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Unvested Shares | Selling, General And Administrative Expenses |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 2,697 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 2,746 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Performance Shares |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 1,342 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 661 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Income tax benefit | (430)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | (186)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Total expense after income taxes | 912 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 475 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Performance Shares | Cost Of Goods Sold |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | 0 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 0 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Performance Shares | Selling, General And Administrative Expenses |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |
Total expense before income taxes | $ 1,342 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | $ 661 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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