Fair Value Measurement Fair Value Inputs, Liabilities, Quantitative Information (Details)	6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]
Adjusted EBITDA Volatility	29.00%
WACC	10.00%
20-year risk free rate	2.82%
Market price of risk	6.93%
Cost of debt	4.16%

Fair Value Assumptions, Cost of Debt

No definition available.

Name:	icui_FairValueAssumptionsCostofDebt
Namespace Prefix:	icui_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Assumptions, Expected Volatility Rate-Adjusted EBITDA

+ References

No definition available.

+ Details

Name:	icui_FairValueAssumptionsExpectedVolatilityRateAdjustedEBITDA
Namespace Prefix:	icui_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Assumptions, Market Price of Risk

+ References

No definition available.

+ Details

Name:	icui_FairValueAssumptionsMarketPriceofRisk
Namespace Prefix:	icui_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration