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Share Based Award Share Award data (Details)	Dec. 31, 2016 $ / shares
Share award data [Abstract]
Share Price	$ 147.35

Share award data [Abstract]

No definition available.

Name:	icui_ShareawarddataAbstract
Namespace Prefix:	icui_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Price of a single share of a number of saleable stocks of a company.

No definition available.

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant