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NET INCOME PER SHARE (Narrative) (Details) - shares shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Shares excluded from computation as their effect would be antidilutive (in shares) | 0.4 | 0.4
Performance Shares and Restricted Units |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Additional EPS shares (in shares) | 0.5 |

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- Definition Additional shares included in the basic and diluted calculation from their date of issuance because no further consideration is due related to the issuance of the underlying common shares + References No definition available. + Details
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Namespace Prefix: | iart_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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