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Commitments and Contingencies Contingency (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Contract settlement | $ 0 | $ 0 | $ 28,917 | $ 0

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

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration