{"cik":1362004,"taxonomy":"us-gaap","tag":"ContractWithCustomerLiabilityNoncurrent","label":"Contract with Customer, Liability, Noncurrent","description":"Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.","entityName":"ICF International, Inc.","units":{"USD":[{"end":"2025-12-31","val":3043000,"accn":"0001193125-26-212358","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07","frame":"CY2025Q4I"},{"end":"2026-03-31","val":12017000,"accn":"0001193125-26-212358","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07","frame":"CY2026Q1I"}]}}