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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 (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Receivables [Abstract] |  |  |
Beginning balance | [1] | $ 25,966 | $ 21,302
Billed receivables sold during the period | [2] | 362,563 | 482,469
Collections from customers during the period | [2],[3] | (349,981) | (473,037)
Ending balance | [4] | $ 38,549 | $ 30,735
[1] | The beginning balanc es represent billed contract receivables that were previously sold and derecognized by the Company but had not been collected from customers 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 represent billed contract receivables that were sold and derecognized by the Company but had not been collected from customers as of September 30, 2025 and 2024, respectively.

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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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration