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Cover
 12 Months Ended
Dec. 31, 2022
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2022
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 333-08704
Entity Registrant Name ICON PLC
Entity Incorporation, State or Country Code L2
Entity Address, Address Line One South County Business Park,
Entity Address, Address Line Two Leopardstown,
Entity Address, City or Town Dublin 18, D18 X5R3
Entity Address, Postal Zip Code D18 X5R3
Entity Address, Country IE
Title of 12(b) Security ORDINARY SHARES, PAR VALUE €0.06 EACH
Trading Symbol ICLR
Security Exchange Name NASDAQ
Entity common stock, shares outstanding (in shares) 81,723,555
Entity Well Known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filler Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Accounting Standard U.S. GAAP
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Entity Central Index Key 0001060955
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One South County Business Park
Entity Address, Address Line Two Leopardstown
Entity Address, City or Town Dublin 18
Entity Address, Postal Zip Code D18 X5R3
Entity Address, Country IE
Contact Personnel Name Brendan Brennan
Contact Personnel Email Address Brendan.Brennan@iconplc.com
Country Region 353
City Area Code 1
Local Phone Number 291-2000