XML 92 R78.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenue From Contract With Customer [Line Items] |  |
Net contract assets (liabilities) | $ 15,474 |
Revenue related to contract liabilities | $ 17,600 | $ 17,800

X
- Definition Change in contract with customer assets liability net current. + References No definition available. + Details
Name: | icfi_ChangeInContractWithCustomerAssetsLiabilitiesNetCurrent
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue from contract with customer. + References No definition available. + Details
Name: | icfi_RevenueFromContractWithCustomerLineItems
Namespace Prefix: | icfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration