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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
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)   18,436,146  
Entity Public Float     $ 2,746
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
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    
Auditor Firm ID 248    
Auditor Name Grant Thornton LLP    
Auditor Location Arlington, Virginia    
Auditor Opinion [Text Block]

Opinion on the financial statements

We have audited the accompanying consolidated balance sheets of ICF International, Inc. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of comprehensive income, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule included under Item 15(2) (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated February 28, 2025 expressed an unqualified opinion.

    
Title of each class Common Stock, $0.001 par value    
Trading Symbol ICFI    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Part III incorporates information by reference from the Proxy Statement for the 2025 Annual Meeting of Stockholders expected to be held in June 2025.