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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 Remitted to MUFG (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Receivables [Abstract] |  |  |
Beginning balance | [1] | $ 23,339 | $ 21,796
Collections from customers during the period | [2],[3] | 349,981 | 473,037
Remittances to MUFG during the period | [3] | (361,462) | (463,558)
Ending balance | [4] | $ 11,857 | $ 31,275
[1] | 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 had not been remitted to MUFG as of January 1, 2025 and 2024, respectively.
[2] | For t he nine months ended September 30, 2025 and 2024, the Company recorded net inflows of $12.6 million and $9.4 million, respectively, in its cash flows from operating activities from the sale of billed contract receivables.
[3] | For the nine months ended September 30, 2025 and 2024, the Company recorded a net outflow of $11.5 million and a net inflow of $9.5 million, respectively, in its cash flows from operating activities from the collection of billed contract receivables that were sold but not yet remitted to MUFG.
[4] | The ending balances are included as part of “Accrued expenses and other current liabilities” on the Company’s consolidated balance sheets.

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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
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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- References No definition available. + Details
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- Definition Repayments of securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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