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Business Segments and Geographic Information Schedule of Information on Company's Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | $ 2,147,767 us-gaap_Revenues |  | $ 2,024,130 us-gaap_Revenues |  | $ 1,954,258 us-gaap_Revenues |
Total net sales | 523,899 us-gaap_SalesRevenueNet | 533,179 us-gaap_SalesRevenueNet | 546,693 us-gaap_SalesRevenueNet | 543,996 us-gaap_SalesRevenueNet | 520,620 us-gaap_SalesRevenueNet | 490,617 us-gaap_SalesRevenueNet | 518,445 us-gaap_SalesRevenueNet | 494,448 us-gaap_SalesRevenueNet | 2,147,767 us-gaap_SalesRevenueNet |  | 2,024,130 us-gaap_SalesRevenueNet |  | 1,954,258 us-gaap_SalesRevenueNet |
Total operating income | 94,454 us-gaap_OperatingIncomeLoss | 110,847 us-gaap_OperatingIncomeLoss | 112,088 us-gaap_OperatingIncomeLoss | 113,835 us-gaap_OperatingIncomeLoss | 103,873 us-gaap_OperatingIncomeLoss | 97,369 us-gaap_OperatingIncomeLoss | 99,559 us-gaap_OperatingIncomeLoss | 94,712 us-gaap_OperatingIncomeLoss | 431,224 us-gaap_OperatingIncomeLoss | [1] | 395,513 us-gaap_OperatingIncomeLoss | [1] | 128,218 us-gaap_OperatingIncomeLoss | [1]
Interest expense |  |  |  |  |  |  |  |  | 41,895 us-gaap_InterestExpense |  | 42,206 us-gaap_InterestExpense |  | 42,250 us-gaap_InterestExpense |
Other (income) expense - net |  |  |  |  |  |  |  |  | (3,111)us-gaap_OtherNonoperatingIncomeExpense |  | 178 us-gaap_OtherNonoperatingIncomeExpense |  | (236)us-gaap_OtherNonoperatingIncomeExpense |
Income before taxes |  |  |  |  |  |  |  |  | 392,440 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 353,129 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 86,204 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Total assets | 2,908,070 us-gaap_Assets |  |  |  | 2,887,577 us-gaap_Assets |  |  |  | 2,908,070 us-gaap_Assets |  | 2,887,577 us-gaap_Assets |  | 2,785,390 us-gaap_Assets |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 76,907 us-gaap_DepreciationDepletionAndAmortization | [2] | 79,334 us-gaap_DepreciationDepletionAndAmortization | [2] | 78,312 us-gaap_DepreciationDepletionAndAmortization | [2]
Total capital expenditures |  |  |  |  |  |  |  |  | 47,997 us-gaap_PaymentsToAcquireProductiveAssets |  | 31,536 us-gaap_PaymentsToAcquireProductiveAssets |  | 35,520 us-gaap_PaymentsToAcquireProductiveAssets |
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | (6,591)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  | (7,383)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  | (11,318)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Corporate Office |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (69,155)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | (55,180)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | (51,717)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1]
Total assets | 269,836 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  | 264,540 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |  |  | 269,836 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 264,540 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 170,493 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 1,393 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [2] | 1,353 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [2] | 1,587 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [2]
Total capital expenditures |  |  |  |  |  |  |  |  | 3,860 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 2,635 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  | 2,191 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
Fluid & Metering Technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 899,588 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 871,814 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 833,288 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |
Total operating income |  |  |  |  |  |  |  |  | 216,886 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [1],[3] | 211,256 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [1],[3] | 146,650 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [1],[3]
Total assets | 1,026,238 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  |  |  | 1,025,352 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  |  |  | 1,026,238 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 1,025,352 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 1,023,143 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 26,453 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [2] | 27,633 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [2] | 29,637 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember | [2]
Total capital expenditures |  |  |  |  |  |  |  |  | 18,215 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 11,581 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 13,535 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |
Fluid & Metering Technologies | External Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 898,530 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 870,720 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 829,320 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |
Fluid & Metering Technologies | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 1,058 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 1,094 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |  | 3,968 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FluidAndMeteringTechnologiesMember |
Health & Science Technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 752,021 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 714,650 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 695,235 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |
Total operating income |  |  |  |  |  |  |  |  | 152,999 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [1],[3] | 136,707 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [1],[3] | (62,835)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [1],[3]
Total assets | 1,101,155 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  |  |  | 1,113,546 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  |  |  | 1,101,155 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 1,113,546 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 1,102,868 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 42,478 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [2] | 43,496 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [2] | 39,981 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember | [2]
Total capital expenditures |  |  |  |  |  |  |  |  | 19,161 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 12,280 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 13,140 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |
Health & Science Technologies | External Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 747,186 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 708,940 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 689,574 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |
Health & Science Technologies | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 4,835 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 5,710 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |  | 5,661 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_HealthAndScienceTechnologiesMember |
Fire & Safety/Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 502,749 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 445,049 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 437,053 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |
Total operating income |  |  |  |  |  |  |  |  | 130,494 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [1] | 102,730 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [1] | 96,120 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [1]
Total assets | 510,841 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  |  |  | 484,139 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  |  |  | 510,841 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 484,139 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 488,886 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 6,583 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [2] | 6,852 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [2] | 7,107 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember | [2]
Total capital expenditures |  |  |  |  |  |  |  |  | 6,761 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 5,040 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 6,654 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |
Fire & Safety/Diversified Products | External Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | 502,051 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 444,470 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | 435,364 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |
Fire & Safety/Diversified Products | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total segment sales |  |  |  |  |  |  |  |  | $ 698 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | $ 579 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |  | $ 1,689 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = iex_FireAndSafetyDiversifiedProductsMember |
[1] | Segment operating income (loss) excludes net unallocated corporate operating expenses.
[2] | Excludes amortization of debt issuance expenses.
[3] | Segment operating income (loss) includes asset impairment charges in 2012 of $27.7 million within the Fluid & Metering Technologies segment and $170.8 million within the Health & Science Technologies segment.

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