ICF International (ICFI) 10-K/A 28 May 24 2023 FY Annual report (amended) Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 23, 2024	Jun. 30, 2023
Cover [Abstract]
Entity Registrant Name	ICF INTERNATIONAL, INC.
Entity Central Index Key	0001362004
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Annual Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		18,715,376
Entity Public Float			$ 2,309
Document Type	10-K/A
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 to Form 10-K (“Form 10-K/A”) amends the Annual Report on Form 10-K of ICF International, Inc. (the “Company”) for the year ended December 31, 2023, previously filed with the Securities and Exchange Commission (the “SEC”) on February 28, 2024 (“Form 10-K”).The Form 10-K/A is being filed to replace the consent of Grant Thornton LLP (the “Consent”), filed as Exhibit 23.1 to the Form 10-K, with an updated version of the Consent as Exhibit 23.1 to the Form 10-K/A to include the reference to Form S-8 File No. 333-272833, which was inadvertently omitted in the February 28, 2024 filing. Pursuant to Rule 12b-15 under the Security Exchange Act of 1934, as amended (the “Exchange Act”), the Form 10-K/A also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. The Form 10-K/A neither includes financial statements nor amends any disclosures with respect to Items 307 and 308 of Regulation S-K under the Exchange Act, consequently paragraphs 3, 4, and 5 of the certifications have been omitted.Except as set forth in the Form 10-K/A, no other changes have been made to the Form 10-K. Additionally, the Form 10-K has not been amended or updated to reflect events occurring after February 28, 2024, except as specifically set forth in the Form 10-K/A.
Entity File Number	001-33045
Entity Tax Identification Number	22-3661438
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Incorporation State Country Code	DE
Entity Address, Address Line One	1902 Reston Metro Plaza
Entity Address, City or Town	Reston
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20190
City Area Code	703
Local Phone Number	934-3000
Title of each class	Common Stock, $0.001 par value
Trading Symbol	ICFI
Security Exchange Name	NASDAQ
Documents Incorporated by Reference	List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980). Part III incorporates information by reference from the Proxy Statement for the 2024 Annual Meeting of Stockholders expected to be held in June 2024 .