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Contract Receivables, Net - Summary of Reconciliation of Cash Collections from Customers of Billed Contract Receivables Previously Sold to MUFG Including Previous Sold Receivables And Remittance of Cash Collections to MUFG And Cash Collected But Not Yet Remitted to MUFG (Parenthetical) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | [2] | Dec. 31, 2022 | [2]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Procceds from sale of billed receivables but not yet remitted to MUFG | $ 9,600 |  | $ 4,100 |  |  |
Sale of billed receivables | $ 31,389 | [1] | $ 10,283 | [1] | $ 21,796 | $ 6,164
[1] | The ending balances are included as part of “Accrued expenses and other current liabilities” on the Company’s consolidated balance sheets.
[2] | The beginning balances represent cash collected from customers on behalf of MUFG for billed contract receivables that were previously sold and derecognized by the Company but have not yet been remitted to MUFG as of January 1, 2024 and 2023, respectively.

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- Definition Proceeds from sale of billed receivables not yet remitted. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sale of receivables liabilities. + References No definition available. + Details
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Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
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Period Type: | duration