v3.26.1
Cover
3 Months Ended
Mar. 31, 2026
Cover [Abstract]  
Document Type 6-K
Document Fiscal Year Focus 2026
Entity Registrant Name ICON plc
Amendment Flag false
Document Fiscal Period Focus Q1
Entity Central Index Key 0001060955
Current Fiscal Year End Date --12-31
Document Period End Date Mar. 31, 2026