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Allocation of Acquisition Costs to Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 28, 2014 | Mar. 18, 2013 | Apr. 30, 2012 | Apr. 11, 2012 | Jul. 20, 2012
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 1,321,277 us-gaap_Goodwill | $ 1,349,456 us-gaap_Goodwill | $ 1,321,727 us-gaap_Goodwill |  |  |  |  |
Aegis Flow Technologies [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 1,147 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Inventory |  |  |  | 6,230 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Other current assets, net of cash acquired |  |  |  | 232 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Property, plant and equipment |  |  |  | 2,988 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Goodwill |  |  |  | 7,711 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Intangible assets |  |  |  | 8,770 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Total assets acquired |  |  |  | 27,078 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Total liabilities assumed |  |  |  | (1,633)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
Net assets acquired |  |  |  | 25,445 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_AegisFlowTechnologiesMember |  |  |  |
FTL |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  | 3,454 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Inventory |  |  |  |  | 4,524 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Other current assets, net of cash acquired |  |  |  |  | 131 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Property, plant and equipment |  |  |  |  | 1,357 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Goodwill |  |  |  |  | 17,994 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Intangible assets |  |  |  |  | 13,016 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Total assets acquired |  |  |  |  | 40,476 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Total liabilities assumed |  |  |  |  | (5,939)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
Net assets acquired |  |  |  |  | 34,537 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_FtlSealsTechnologyMember |  |  |
ERC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | 5,766 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Inventory |  |  | 4,224 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Other current assets, net of cash acquired |  |  | 981 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Property, plant and equipment |  |  | 2,738 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Goodwill |  |  | 8,499 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  | 8,500 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |
Intangible assets |  |  | 5,642 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Other assets |  |  | 1,509 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Total assets acquired |  |  | 29,359 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Total liabilities assumed |  |  | (16,074)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
Net assets acquired |  |  | 13,285 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_ErcMember |  |  |  |  |
PPC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | 877 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Inventory |  |  | 932 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Other current assets, net of cash acquired |  |  | 252 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Property, plant and equipment |  |  | 1,936 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Goodwill |  |  | 13,941 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  | 13,900 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |
Intangible assets |  |  | 5,104 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Other assets |  |  | 13 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Total assets acquired |  |  | 23,055 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Total liabilities assumed |  |  | (2,465)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Net assets acquired |  |  | 20,590 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_PrecisionPhotonicsCorporationMember |  |  |  |  |
Matcon |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | 7,768 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Inventory |  |  | 604 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Other current assets, net of cash acquired |  |  | 1,880 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Property, plant and equipment |  |  | 5,695 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Goodwill |  |  | 27,947 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  | 28,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember
Intangible assets |  |  | 14,081 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Other assets |  |  | 53 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Total assets acquired |  |  | 58,028 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Total liabilities assumed |  |  | (12,215)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
Net assets acquired |  |  | 45,813 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_MatconGroupLimitedMember |  |  |  |  |
ERC, PPC and Matcon [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | 14,411 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Inventory |  |  | 5,760 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Other current assets, net of cash acquired |  |  | 3,113 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Property, plant and equipment |  |  | 10,369 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Goodwill |  |  | 50,387 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Intangible assets |  |  | 24,827 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Other assets |  |  | 1,575 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Total assets acquired |  |  | 110,442 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Total liabilities assumed |  |  | (30,754)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |
Net assets acquired |  |  | $ 79,688 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = iex_ERCPPCandMatconMember |  |  |  |  |

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