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v3.23.1

Contract Receivables, Net - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Financing Receivable, Past Due [Line Items] |  |
Cash collected not yet remitted to purchaser of billed receivables | $ 13,225 | $ 6,164
Master Receivables Purchase Agreement with MUFG Bank |  |
Financing Receivable, Past Due [Line Items] |  |
Contract Receivables, Net | 28,600 |
Cash collected not yet remitted to purchaser of billed receivables | $ 13,200 | $ 6,200

X
- Definition Cash collected not yet remitted to purchaser of billed receivables. + References No definition available. + Details
Name: | icfi_CashCollectedNotYetRemittedToPurchaserOfBilledReceivables
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 No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
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: |