v3.25.2
Cover
6 Months Ended
Jun. 30, 2025
Cover [Abstract]  
Document Type 6-K
Document Fiscal Year Focus 2025
Entity Registrant Name ICON plc
Amendment Flag false
Document Fiscal Period Focus Q2
Entity Central Index Key 0001060955
Current Fiscal Year End Date --12-31
Document Period End Date Jun. 30, 2025