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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 Yet Collected from Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Receivables [Abstract] |  |  |  |  |
Beginning balance | [1] | $ 21,302 | [2] | $ 3,818 |
Billed receivables sold during the period | [3] | 634,081 |  | 260,904 |
Collections from customers during the period | [3],[4] | (629,417) |  | (243,420) |
Ending balance | [2] | $ 25,966 |  | $ 21,302 | [1]
[1] | The beginning balances represent billed contract receivables that were previously sold and derecognized by the Company but have not yet been collected from customers as of January 1, 2024 and 2023, respectively.
[2] | The ending balances represent billed contract receivables that were sold and derecognized by the Company but have not yet been collected from customers as of December 31, 2024 and 2023, respectively.
[3] | For the twelve months ended December 31, 2024 and 2023, the Company recorded net inflows of $4.7 million and $17.5 million, respectively, in its cash flows from operating activities from the sale of billed contract receivables.
[4] | For the twelve months ended December 31, 2024 and 2023, the Company recorded net inflows of $1.5 million and $15.6 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.

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- Definition Billed contract receivables sold but not yet collected from customers. + References No definition available. + Details
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Namespace Prefix: | icfi_
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Balance Type: | credit
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- Definition Amount of decrease from sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
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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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Balance Type: | debit
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- References No definition available. + Details
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