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Revenue Contract Liabilities Text (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Contract asset and liability balances [Line Items] |
Contract with Customer, Liability, Revenue Recognized | $ 3.8
Equipment revenue [Member] |
Contract asset and liability balances [Line Items] |
Revenue, Remaining Performance Obligation, Amount | 3.3
Software revenue [Member] |
Contract asset and liability balances [Line Items] |
Revenue, Remaining Performance Obligation, Amount | $ 1.6

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- Definition [Line Items] for Contract asset and liability balances [Table] + References No definition available. + Details
Name: | icui_ContractassetandliabilitybalancesLineItems
Namespace Prefix: | icui_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=icui_EquipmentrevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=icui_SoftwarerevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |