Note A - Basis of Presentation and Nature of Operations	12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE A—BASIS OF PRESENTATION AND NATURE OF OPERATIONS Basis of Presentation and Nature of Operations The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”), and its subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, “the Company”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. All significant intercompany transactions and balances have been eliminated. Nature of Operations The Company provides management, technology, and policy professional services in the areas of energy, environment, and infrastructure; health, social programs, and consumer/financial; and public safety and defense. The Company’s major clients are U.S. federal government departments and agencies, most significantly Department of Health and Human Services (“HHS”), Department of State and Department of Defense. We also serve U.S. state and local government departments and agencies; international governments; and commercial clients worldwide, such as airlines, airports, electric and gas utilities, oil companies, hospitals and health-related companies, banks and other financial services companies, travel and hospitality, non-profits/associations, law firms, manufacturing, retail, and distribution. The Company offers a full range of services to these clients, including strategy, analysis, program management, and information technology solutions that combine experienced professional staff, industry and institutional knowledge, and analytical methods. The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including over 55 offices in the United States and over 15 offices in key markets outside the United States, including offices in the United Kingdom, Belgium, China, India and Canada. Reclassifications Certain amounts in the 2013 and 2012 consolidated financial statements have been reclassified to conform to the current year presentation.

Note A - Basis of Presentation and Nature of Operations

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

NOTE A—BASIS OF PRESENTATION AND NATURE OF OPERATIONS

Basis of Presentation and Nature of Operations

The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”), and its subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, “the Company”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. All significant intercompany transactions and balances have been eliminated.

Nature of Operations

The Company provides management, technology, and policy professional services in the areas of energy, environment, and infrastructure; health, social programs, and consumer/financial; and public safety and defense. The Company’s major clients are U.S. federal government departments and agencies, most significantly Department of Health and Human Services (“HHS”), Department of State and Department of Defense. We also serve U.S. state and local government departments and agencies; international governments; and commercial clients worldwide, such as airlines, airports, electric and gas utilities, oil companies, hospitals and health-related companies, banks and other financial services companies, travel and hospitality, non-profits/associations, law firms, manufacturing, retail, and distribution. The Company offers a full range of services to these clients, including strategy, analysis, program management, and information technology solutions that combine experienced professional staff, industry and institutional knowledge, and analytical methods.

The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including over 55 offices in the United States and over 15 offices in key markets outside the United States, including offices in the United Kingdom, Belgium, China, India and Canada.

Reclassifications

Certain amounts in the 2013 and 2012 consolidated financial statements have been reclassified to conform to the current year presentation.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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