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Income Taxes: Deferred tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets and liabilities [Line Items]    
Deferred Tax Assets, Net, Current $ 4,683us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 4,351us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax asset 9,258icui_Noncurrentdeferredtaxasset 7,518icui_Noncurrentdeferredtaxasset
Deferred Tax Liabilities, Gross, Noncurrent 1,376us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 3,630us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Current deferred tax asset, gross total [Member]    
Deferred tax assets and liabilities [Line Items]    
Deferred Tax Assets, State Taxes 252us-gaap_DeferredTaxAssetsStateTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 298us-gaap_DeferredTaxAssetsStateTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 406us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 706us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 2,110us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 1,973us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Tax Credit Carryforward, Deferred Tax Asset 226us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 276us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts 151us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 140us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Inventory 1,538us-gaap_DeferredTaxAssetsInventory
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember		 958us-gaap_DeferredTaxAssetsInventory
/ us-gaap_BalanceSheetLocationAxis
= icui_CurrentDeferredTaxAssetGrossTotalMember
Non-current deferred tax asset, gross total [Member]    
Deferred tax assets and liabilities [Line Items]    
Deferred Tax Assets, State Taxes (2,114)us-gaap_DeferredTaxAssetsStateTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 0us-gaap_DeferredTaxAssetsStateTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 1,499us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 1,338us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 494us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 546us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Noncurrent deferred tax asset - depreciation and amortization (5,594)icui_NoncurrentDeferredTaxAssetDepreciationAndAmortization
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 (429)icui_NoncurrentDeferredTaxAssetDepreciationAndAmortization
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Noncurrent deferred tax asset - acquired future tax deductions 639icui_Noncurrentdeferredtaxassetacquiredfuturetaxdeductions
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 0icui_Noncurrentdeferredtaxassetacquiredfuturetaxdeductions
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 6,778us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Deferred Tax Assets, Unrealized Currency Losses 2,680us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 0us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Noncurrent deferred tax asset - tax credits state 4,876icui_NoncurrentDeferredTaxAssetTaxCreditsState
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember		 6,063icui_NoncurrentDeferredTaxAssetTaxCreditsState
/ us-gaap_BalanceSheetLocationAxis
= icui_NonCurrentDeferredTaxAssetGrossTotalMember
Noncurrent deferred tax liability [Member]    
Deferred tax assets and liabilities [Line Items]    
Noncurrent deferred tax liability - state income taxes 0icui_NoncurrentDeferredTaxLiabilityStateIncomeTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 2,163icui_NoncurrentDeferredTaxLiabilityStateIncomeTaxes
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Noncurrent deferred tax liability - foreign 1,376icui_NoncurrentDeferredTaxLiabilityForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 0icui_NoncurrentDeferredTaxLiabilityForeign
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 186us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Noncurrent deferred tax liability - depreciation and amortization 0icui_NoncurrentDeferredTaxLiabilityDepreciationAndAmortization
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 5,906icui_NoncurrentDeferredTaxLiabilityDepreciationAndAmortization
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Noncurrent deferred tax liability - acquired future tax deductions 0icui_NoncurrentDeferredTaxLiabilityAcquiredFutureTaxDeductions
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 610icui_NoncurrentDeferredTaxLiabilityAcquiredFutureTaxDeductions
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Noncurrent deferred tax liability - stock based compensation 0icui_NoncurrentDeferredTaxLiabilityStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 (5,684)icui_NoncurrentDeferredTaxLiabilityStockBasedCompensation
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember
Deferred Tax Liabilities, Unrealized Currency Transaction Gains $ 0us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember		 $ 449us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
/ us-gaap_BalanceSheetLocationAxis
= icui_NoncurrentDeferredTaxLiabilityMember