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General and Summary of Significant Accounting Policies Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost $ 224,714,000us-gaap_PropertyPlantAndEquipmentGross $ 213,001,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated Depreciation 138,623,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 125,140,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net property and equipment 86,091,000us-gaap_PropertyPlantAndEquipmentNet 87,861,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation 17,000,000us-gaap_Depreciation 17,000,000us-gaap_Depreciation 16,400,000us-gaap_Depreciation
Government incentive reimbursement 3,300,000icui_GovernmentIncentiveReimbursement 3,700,000icui_GovernmentIncentiveReimbursement  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost 90,744,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
84,317,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Land, Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost 71,415,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandBuildingsAndImprovementsMember
64,238,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandBuildingsAndImprovementsMember
 
Molds [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost 33,166,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= icui_MoldsMember
30,813,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= icui_MoldsMember
 
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost 3,571,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
3,552,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Computer Equipment and Software [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost 23,228,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= icui_ComputerEquipmentAndSoftwareMember
21,625,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= icui_ComputerEquipmentAndSoftwareMember
 
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, cost $ 2,590,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 8,456,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
 
Minimum [Member] | Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 15    
Minimum [Member] | Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 15    
Minimum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 2    
Minimum [Member] | Furniture, fixtures and molds [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 2    
Minimum [Member] | Computer Equipment and Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 3    
Maximum [Member] | Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 30    
Maximum [Member] | Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 15    
Maximum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 10    
Maximum [Member] | Furniture, fixtures and molds [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 5    
Maximum [Member] | Computer Equipment and Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 5