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Computed Amount and Differences in Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Pretax income | $ 392,440 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 353,129 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 86,204 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Computed amount at statutory rate of 35% | 137,354 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 123,595 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 30,171 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income tax (net of federal tax benefit) | 4,875 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 4,382 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,406 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Taxes on non-U.S. earnings-net of foreign tax credits | (9,378)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (9,683)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 1,189 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Effect of flow-through entities | (9,018)iex_EffectOfPassThroughEntitiesOnTax | (7,267)iex_EffectOfPassThroughEntitiesOnTax | (7,846)iex_EffectOfPassThroughEntitiesOnTax
Goodwill and intangible asset impairments | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 28,524 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
U.S. business tax credits | (1,680)us-gaap_IncomeTaxReconciliationTaxCredits | (1,516)us-gaap_IncomeTaxReconciliationTaxCredits | 0 us-gaap_IncomeTaxReconciliationTaxCredits
Domestic activities production deduction | (7,489)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (6,217)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (5,267)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Other | (1,610)us-gaap_IncomeTaxReconciliationTaxContingenciesOther | (5,380)us-gaap_IncomeTaxReconciliationTaxContingenciesOther | (603)us-gaap_IncomeTaxReconciliationTaxContingenciesOther
Total provision for income taxes | $ 113,054 us-gaap_IncomeTaxExpenseBenefit | $ 97,914 us-gaap_IncomeTaxExpenseBenefit | $ 48,574 us-gaap_IncomeTaxExpenseBenefit

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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