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STOCK-BASED COMPENSATION (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 stock_based_compensation_plan | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 | May 31, 2010 | Jul. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for purchase (in shares) | 1,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  |  |
Number of stock-based compensation plans | 3 iart_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  |  |  |  |
Dividend yield | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ 18.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 13.86 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 12.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |
Cash received from option exercises | $ 15,200,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | $ 2,300,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | $ 700,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  |  |
Share-based compensation expense recognized | 15,105,000 us-gaap_AllocatedShareBasedCompensationExpense | 10,393,000 us-gaap_AllocatedShareBasedCompensationExpense | 9,051,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |
Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options exercisable for officers, directors and employees, vesting period, in years | 4 years |  |  |  |  |
Stock options exercisable for directors, expiration period, in years | 6 years |  |  |  |  |
Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options exercisable for employees, expiration period, in years | 6 years |  |  |  |  |
Stock options exercisable for directors, expiration period, in years | 10 years |  |  |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation costs related to unvested awards | 1,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Weighted-average period for cost recognition, in years | 2 years |  |  |  |  |
Restricted Stock, Performance Stock and Contract Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation costs related to unvested awards | 11,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember |  |  |  |  |
Weighted-average period for cost recognition, in years | 2 years |  |  |  |  |
Share-based compensation expense recognized | 13,700,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember | 9,200,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember | 7,700,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember |  |  |
Fair value of shares vested | 9,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember | 6,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember | 6,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = iart_RestrictedStockPerformanceStockAndContractStockMember |  |  |
Requisite service periods of performance stock, restricted stock and contract stock awards, in years | 3 years |  |  |  |  |
Deferred Stock Units (SUs) | Executive Chairman |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Distribution of common stock to individual (in shares) |  |  |  | 1,670,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = iart_DeferredStockUnitsSusMember / iart_ShareBasedCompensationArrangementWithIndividualAxis = us-gaap_BoardOfDirectorsChairmanMember |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |
Restricted Stock Units (RSUs) | Non Former Chief Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non issued vested restricted stock units (in shares) | 200,000 iart_NonIssuedVestedRestrictedStockUnits / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = iart_NonFormerChiefExecutiveOfficerMember |  |  |  |  |
2000 and 2001 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = iart_TwoThousandAndTwoThousandOnePlanMember |  |  |  |  |
2003 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 6,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = iart_TwoThousandThreePlanMember |  |  |  |  |
Increase in authorized shares (in shares) |  |  |  |  | 1,750,000 iart_IncreaseInAuthorizedShares / us-gaap_PlanNameAxis = iart_TwoThousandThreePlanMember | 750,000 iart_IncreaseInAuthorizedShares / us-gaap_PlanNameAxis = iart_TwoThousandThreePlanMember
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 1,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Shares available for purchase (in shares) | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Shares issued (in shares) | 4,475 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | 6,309 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | 6,315 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |
ESPP proceeds received | $ 200,000 iart_EmployeeStockPurchasePlanProceeds / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 300,000 iart_EmployeeStockPurchasePlanProceeds / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 200,000 iart_EmployeeStockPurchasePlanProceeds / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |
Discount percentage available to participants | 5.00%iart_DiscountAvailableToParticipantsReducedToPercent / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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