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Long-Term Obligations Line of Credit Pricing (Details) | 12 Months Ended
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Dec. 31, 2019
Pricing Level I [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Commitment Fee Percentage | 0.15%
LIBOR Basis Spread on Variable Rate | 1.25%
Debt Instrument, Basis Spread on Variable Rate | 0.25%
Pricing Level II [Member] [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Commitment Fee Percentage | 0.20%
LIBOR Basis Spread on Variable Rate | 1.50%
Debt Instrument, Basis Spread on Variable Rate | 0.50%
Pricing Level III [Member] [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Commitment Fee Percentage | 0.25%
LIBOR Basis Spread on Variable Rate | 1.75%
Debt Instrument, Basis Spread on Variable Rate | 0.75%
Pricing Level IV [Member] [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Commitment Fee Percentage | 0.30%
LIBOR Basis Spread on Variable Rate | 2.00%
Debt Instrument, Basis Spread on Variable Rate | 1.00%

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- Definition LIBOR Basis Spread on Variable Rate + References No definition available. + Details
Name: | icui_LIBORBasisSpreadonVariableRate
Namespace Prefix: | icui_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=icui_PricingLevelIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=icui_PricingLevelIIMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=icui_PricingLevelIIIMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=icui_PricingLevelIVMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |