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=118260190&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:	num: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=109980867&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=109980867&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_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NetInvestmentHedgingMember
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_CrossCurrencyInterestRateContractOneMember
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_DerivativeInstrumentRiskAxis=iart_CrossCurrencyInterestRateContractTwoMember
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_CrossCurrencyInterestRateContractFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

DERIVATIVE INSTRUMENTS (Schedule of Net Investment Hedges Derivatives) (Details) - Net Investment Hedging - Designated as Hedging Instrument € in Thousands, £ in Thousands, SFr in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 CHF (SFr)
Cross Currency Interest Rate Swap One
Derivative [Line Items]
Fair Value Asset (Liability)	$ 2,459,000				$ 1,359,000
Cross Currency Interest Rate Swap One \| Long
Derivative [Line Items]
Fixed Interest Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount \| €		€ 44,859				€ 70,738
Cross Currency Interest Rate Swap One \| Short
Derivative [Line Items]
Fixed Interest Rate	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%
Aggregate Notional Amount	$ 52,000,000				$ 82,000,000
Cross Currency Interest Rate Swap Two
Derivative [Line Items]
Fair Value Asset (Liability)	$ 3,087,000				$ (421,000)
Cross Currency Interest Rate Swap Two \| Long
Derivative [Line Items]
Fixed Interest Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount \| €		€ 51,760				€ 51,760
Cross Currency Interest Rate Swap Two \| Short
Derivative [Line Items]
Fixed Interest Rate	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%
Aggregate Notional Amount	$ 60,000,000				$ 60,000,000
Cross Currency Interest Rate Swap Three
Derivative [Line Items]
Fair Value Asset (Liability)	$ 2,032,000				$ (150,000)
Cross Currency Interest Rate Swap Three \| Long
Derivative [Line Items]
Fixed Interest Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount \| €		€ 38,820				€ 38,820
Cross Currency Interest Rate Swap Three \| Short
Derivative [Line Items]
Fixed Interest Rate	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%
Aggregate Notional Amount	$ 45,000,000				$ 45,000,000
Cross Currency Interest Rate Swap Four
Derivative [Line Items]
Fair Value Asset (Liability)	$ (154,000)				$ 2,360,000
Cross Currency Interest Rate Swap Four \| Long
Derivative [Line Items]
Fixed Interest Rate	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%
Aggregate Notional Amount \| £			£ 128,284				£ 128,284
Cross Currency Interest Rate Swap Four \| Short
Derivative [Line Items]
Fixed Interest Rate	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%
Aggregate Notional Amount	$ 167,500,000				$ 167,500,000
Cross Currency Interest Rate Swap Five
Derivative [Line Items]
Fair Value Asset (Liability)	$ 1,221,000				$ (3,780,000)
Cross Currency Interest Rate Swap Five \| Long
Derivative [Line Items]
Fixed Interest Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount \| SFr				SFr 165,172				SFr 165,172
Cross Currency Interest Rate Swap Five \| Short
Derivative [Line Items]
Fixed Interest Rate	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%
Aggregate Notional Amount \| £			£ 128,284				£ 128,284
Cross Currency Interest Rate Swap
Derivative [Line Items]
Aggregate Notional Amount	$ 30,000,000.0
Fair Value Asset (Liability)	$ 8,645,000				$ (632,000)