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Schedule of Compensation Cost for Stock Options and Unvested Shares (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Total expense before income taxes | $ 20,717 us-gaap_ShareBasedCompensation | $ 16,993 us-gaap_ShareBasedCompensation | $ 13,102 us-gaap_ShareBasedCompensation
Stock Option |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Total expense before income taxes | 6,826 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 6,268 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 6,292 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Income tax benefit | (2,194)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (2,016)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (1,988)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Total expense after income taxes | 4,632 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 4,252 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 4,304 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 | 581 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 479 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 650 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 | 6,245 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 5,789 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 5,642 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 | 10,670 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 9,851 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 6,810 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember
Income tax benefit | (2,233)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | (2,296)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | (1,682)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember
Total expense after income taxes | 8,437 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 7,555 iex_ShareBasedCompensationAfterTax / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember | 5,128 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 | 1,753 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 1,380 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 991 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 | $ 8,917 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | $ 8,471 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | $ 5,819 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = iex_UnvestedSharesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember

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