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Contract Receivables, Net - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Financing Receivable, Past Due [Line Items] |  |  |
Proceeds from (payments for) sale of billed contract receivables amount | $ (2.6) | $ 23.0 |
Master Receivables Purchase Agreement with MUFG Bank |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Cash collected not yet remitted to purchaser of billed receivables | $ 0.2 |  | $ 7.9

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- Definition Cash collected not yet remitted to purchaser of billed receivables. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds from (payments for) sale and collection of receivables. + References No definition available. + Details
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Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |