Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 0-26224    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 51-0317849    
Entity Address, Address Line One 1100 Campus Road    
Entity Address, Postal Zip Code 08540    
Entity Address, City or Town Princeton    
Entity Address, State or Province NJ    
City Area Code 609    
Local Phone Number 275-0500    
Title of 12(b) Security Common Stock, Par Value $.01 Per Share    
Trading Symbol IART    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Smaller Reporting Company false    
Emerging Growth Company false    
Shell Company false    
Entity Public Float     $ 3,945.6
Entity Common Stock, Shares Outstanding (in shares)   84,442,804  
Documents Incorporated by Reference
Certain portions of the registrant’s definitive proxy statement relating to its scheduled May 13, 2020 Annual Meeting of Stockholders are incorporated by reference in Part III of this report.

Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000917520    
Current Fiscal Year End Date --12-31