Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CrossCurrencyInterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=iart_CodmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=iart_CrossCurrencyInterestRateContractThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=iart_CrossCurrencyInterestRateContractOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=iart_CrossCurrencyInterestRateContractTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DERIVATIVE INSTRUMENTS - Schedule of Cross Currency Swap Derivatives (Details)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 CHF (SFr)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CHF (SFr)	Dec. 21, 2020 USD ($)	Dec. 21, 2020 CHF (SFr)	Oct. 02, 2017 USD ($)	Oct. 02, 2017 CHF (SFr)
Cross-currency swap
Derivative [Line Items]
Aggregate Notional Amount			$ 7,300,000			$ 471,600,000	SFr 420,100,000
Codman \| Cross-currency swap \| Long
Derivative [Line Items]
Aggregate Notional Amount \| SFr									SFr 291,200,000
Codman \| Cross-currency swap \| Short
Derivative [Line Items]
Aggregate Notional Amount								$ 300,000,000
Cash Flow Hedges \| Designated as Hedging Instrument
Derivative [Line Items]
Fair Value Asset (Liability)	$ (54,814,000)			$ (93,769,000)
Cash Flow Hedges \| Designated as Hedging Instrument \| Cross Currency Interest Rate Swap Three \| Long
Derivative [Line Items]
Fixed Rate	3.00%	3.00%
Aggregate Notional Amount \| SFr		SFr 402,887,000			SFr 420,137,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Cross Currency Interest Rate Swap Three \| Short
Derivative [Line Items]
Fixed Rate	3.98%	3.98%
Aggregate Notional Amount	$ 452,275,000			471,640,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman
Derivative [Line Items]
Fair Value Asset (Liability)	8,759,000			(23,440,000)
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap One
Derivative [Line Items]
Fair Value Asset (Liability)	$ (1,727,000)			(4,335,000)
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap One \| Long
Derivative [Line Items]
Fixed Rate	1.85%	1.85%
Aggregate Notional Amount \| SFr		SFr 48,533,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap One \| Short
Derivative [Line Items]
Fixed Rate	4.46%	4.46%
Aggregate Notional Amount	$ 50,000,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap Two
Derivative [Line Items]
Fair Value Asset (Liability)	$ (3,894,000)			(11,262,000)
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap Two \| Long
Derivative [Line Items]
Fixed Rate	1.95%	1.95%
Aggregate Notional Amount \| SFr		SFr 145,598,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap Two \| Short
Derivative [Line Items]
Fixed Rate	4.52%	4.52%
Aggregate Notional Amount	$ 150,000,000
Cash Flow Hedges \| Designated as Hedging Instrument \| Codman \| Cross Currency Interest Rate Swap Three
Derivative [Line Items]
Fair Value Asset (Liability)	$ 14,380,000			$ (7,843,000)