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Legal settlements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Legal Settlements [Abstract] |  |  |
Legal settlements, including amounts awarded in a dispute and charges/amounts paid out in a separate dispute. | $ 0 | $ 0 | $ 1,798
Legal settlement charge |  |  | 6,500
LegalSettlementChargeForLegalFees |  |  | 700
Payments for Legal Settlements |  |  | 7,500
Gross legal settlement award |  |  | 8,800
Legal settlements |  |  | $ 5,300

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- Definition Gross legal settlement award, before legal fees + References No definition available. + Details
Name: | icui_Grosslegalsettlementaward
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reimbursement of legal fees and expenses associated wtih an arbitration ruling. + References No definition available. + Details
Name: | icui_LegalSettlementChargeForLegalFees
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Legal Settlements [Abstract] + References No definition available. + Details
Name: | icui_LegalSettlementsAbstract
Namespace Prefix: | icui_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Legal settlement charge + References No definition available. + Details
Name: | icui_Legalsettlementcharge
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Legal settlements:Amounts awarded in a dispute and/or charges/amounts paid out in a separate dispute. + References No definition available. + Details
Name: | icui_Legalsettlementsincludingamountsawardedinadisputeandchargesamountspaidoutinaseparatedispute.
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net legal settlement + References No definition available. + Details
Name: | icui_Netlegalsettlement
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration