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Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type (Sales Revenue, Services, Net [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]      
Percentage of revenue by contract 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Time And Materials Contract [Member]      
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]      
Percentage of revenue by contract 47.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_TimeAndMaterialsContractMember		 52.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_TimeAndMaterialsContractMember		 49.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_TimeAndMaterialsContractMember
Fixed Price Contract [Member]      
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]      
Percentage of revenue by contract 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_FixedPriceContractMember		 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_FixedPriceContractMember		 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_FixedPriceContractMember
Cost Based Contract [Member]      
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]      
Percentage of revenue by contract 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_CostBasedContractMember		 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_CostBasedContractMember		 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ProductOrServiceAxis
= icfi_CostBasedContractMember