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Contract Receivables, Net - Summary of Reconciliation of Billed Contract Receivables Sold to MUF Including Receivables Sold to MUFC And Collected from Customers on Behalf of MUFG And Receivables Not Collected from Customers (Parenthetical) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Receivables [Abstract]
Proceeds from (payments for) sale of billed contract receivables	$ 12.6	$ 9.4

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- Definition

Proceeds from (payments for) sale of billed contract receivables.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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