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Restructuring - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 employee
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax restructuring expenses related to restructuring initiative | $ 13,672,000 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges | $ 32,473,000 us-gaap_RestructuringCharges |
Restructuring liabilities | 6,056,000 us-gaap_RestructuringReserve | 0 us-gaap_RestructuringReserve | 10,887,000 us-gaap_RestructuringReserve |
2014 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax restructuring expenses related to restructuring initiative | 13,672,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandFourteenInitiativeMember |  |  |
Number of employees | 217 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandFourteenInitiativeMember |  |  |
2011 Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax restructuring expenses related to restructuring initiative |  |  | 32,473,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandElevenInitiativesMember | 32,500,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandElevenInitiativesMember
Number of employees |  |  |  | 491 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandElevenInitiativesMember
Restructuring liabilities |  | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = iex_TwoThousandElevenInitiativesMember |  |

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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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