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Acquired Intangible Assets and Weighted Average Amortization Periods (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Mar. 18, 2013 | Dec. 31, 2012 | Apr. 28, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | $ 13,016 us-gaap_FinitelivedIntangibleAssetsAcquired1 | $ 24,827 us-gaap_FinitelivedIntangibleAssetsAcquired1 |
Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 1,005 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 8,973 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Weighted Average Life | 15 years | 15 years |
Non-Compete Agreements |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 224 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 470 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Weighted Average Life | 3 years | 3 years |
Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 10,950 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 11,343 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Weighted Average Life | 9 years | 6 years |
Unpatented technology and other |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total | 837 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember | 4,041 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember |
Weighted Average Life | 8 years | 8 years |
Aegis Flow Technologies [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total |  |  | 8,770 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember
Aegis Flow Technologies [Member] | Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total |  |  | 3,304 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Weighted Average Life |  |  | 15 years
Aegis Flow Technologies [Member] | Customer Relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total |  |  | 4,393 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted Average Life |  |  | 13 years 6 months
Aegis Flow Technologies [Member] | Unpatented technology and other |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, Total |  |  | $ 1,073 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnpatentedTechnologyMember
Weighted Average Life |  |  | 7 years 6 months

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