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Contract Receivables, Net - Additional Information (Details) - Master Receivables Purchase Agreement with MUFG Bank - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Contract Receivables, Net	$ 37.8	$ 66.4
Cash collected not yet remitted to purchaser of billed receivables	$ 10.3	$ 10.3	$ 6.2

X

- Definition

Cash collected not yet remitted to purchaser of billed receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	icfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Sale of billed contract receivables.

+ References

No definition available.

+ Details

Name:	icfi_SaleOfBilledContractReceivables
Namespace Prefix:	icfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	icfi_ContractReceivablesAxis=icfi_MasterReceivablesPurchaseAgreementWithMufgBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: