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SUMMARY OF SIGNIFICANT ACCOUNT POLICIES (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes | $ 8,975,000 us-gaap_IncomeTaxExpenseBenefit | $ (10,235,000)us-gaap_IncomeTaxExpenseBenefit | $ 10,825,000 us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |  |
Capitalized interest |  |  | 2,100,000 us-gaap_InterestCostsCapitalized | 1,400,000 us-gaap_InterestCostsCapitalized | 400,000 us-gaap_InterestCostsCapitalized |  |  |  |
Number of reportable segments | 5 us-gaap_NumberOfReportableSegments |  |  |  |  |  |  |  |
Inventory, Capitalized Expenses | 0 iart_InventoryCapitalizedExpenses | 0 iart_InventoryCapitalizedExpenses |  |  |  |  |  |  |
Depreciation expense | 30,200,000 us-gaap_Depreciation | 27,600,000 us-gaap_Depreciation | 27,500,000 us-gaap_Depreciation |  |  |  |  |  |
Interest expense capitalized to property, plant, and equipment | 2,600,000 us-gaap_InterestCostsCapitalizedAdjustment | 3,200,000 us-gaap_InterestCostsCapitalizedAdjustment |  |  |  |  |  |  |
Goodwill impairment charge | 0 us-gaap_GoodwillImpairmentLoss | 46,738,000 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |
Impairment of Indefinite-lived Assets | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |  |  |  |  |  |  |  |
Amortization expense | 31,800,000 us-gaap_AdjustmentForAmortization | 19,400,000 us-gaap_AdjustmentForAmortization | 25,100,000 us-gaap_AdjustmentForAmortization |  |  |  |  |  |
Annual amortization expense expected to approximate in 2015 | 32,100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  |  |  |
Annual amortization expense expected to approximate in 2016 | 29,900,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  |  |  |
Annual amortization expense expected to approximate in 2017 | 27,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  |  |  |
Annual amortization expense expected to approximate in 2018 | 27,500,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  |  |  |
Annual amortization expense expected to approximate in 2019 | 26,700,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  |  |  |
Charitable contributions | 600,000 iart_CharitableContributions | 600,000 iart_CharitableContributions | 1,000,000 iart_CharitableContributions |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | 223,500,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |
Amount of Unrecognized Deferred Tax Liability | 36,400,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |
Distribution and handling costs | 14,300,000 us-gaap_ShippingHandlingAndTransportationCosts | 14,100,000 us-gaap_ShippingHandlingAndTransportationCosts | 13,600,000 us-gaap_ShippingHandlingAndTransportationCosts |  |  |  |  |  |
Extended warranties, in years | 2 years |  |  |  |  |  |  |  |
Accrued warranty expense | 300,000 us-gaap_ProductWarrantyAccrual | 300,000 us-gaap_ProductWarrantyAccrual |  |  |  |  | 300,000 us-gaap_ProductWarrantyAccrual |  |
Capitalized research and development costs | 200,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired | 300,000 us-gaap_IndefinitelivedIntangibleAssetsAcquired |  |  |  |  |  |  |
Pension contributions | 900,000 us-gaap_PensionContributions | 800,000 us-gaap_PensionContributions | 800,000 us-gaap_PensionContributions |  |  |  |  |  |
Interest paid | 10,900,000 us-gaap_InterestPaid | 9,500,000 us-gaap_InterestPaid | 12,000,000 us-gaap_InterestPaid |  |  |  |  |  |
Interest paid, capitalized | 2,600,000 us-gaap_InterestPaidCapitalized | 3,200,000 us-gaap_InterestPaidCapitalized | 2,100,000 us-gaap_InterestPaidCapitalized |  |  |  |  |  |
Income taxes paid | 10,900,000 us-gaap_IncomeTaxesPaid | 7,600,000 us-gaap_IncomeTaxesPaid | 12,700,000 us-gaap_IncomeTaxesPaid |  |  |  |  |  |
Capital expenditures incurred but not yet paid | 3,600,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 8,600,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 9,500,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid |  |  |  |  |  |
Europe |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivables from certain European countries customers | 6,200,000 us-gaap_AccountsReceivableNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 6,100,000 us-gaap_AccountsReceivableNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  |  | 6,100,000 us-gaap_AccountsReceivableNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |
Accounts receivable reserved from certain European countries | 300,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 700,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  |  | 700,000 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |
In-Process Research And Development |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges | 200,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 400,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 100,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |  |  |  |  |  |
Technology |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Amortization expense, included in cost of product revenues | 19,300,000 us-gaap_CostOfGoodsSoldAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iart_TechnologyMember | 6,700,000 us-gaap_CostOfGoodsSoldAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iart_TechnologyMember | 6,600,000 us-gaap_CostOfGoodsSoldAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iart_TechnologyMember |  |  |  |  |  |
U.S. Spine |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  | 46,700,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iart_U.S.SpineMember |  |  |
Goodwill Tax Deductible Amount |  |  |  |  |  |  | 16,200,000 iart_GoodwillTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = iart_U.S.SpineMember |  |
Computer Equipment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capital Leased Assets, Gross | 2,000,000 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | 1,600,000 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |  |  |  | 1,600,000 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 700,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | 100,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |  |  |  | 100,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |
Out-of-period Adjustment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  | (2,422,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  | 1,000,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Capitalized interest |  |  |  |  |  |  |  | 3,300,000 us-gaap_InterestCostsCapitalized / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
First Three Quarters of 2012 | Out-of-period Adjustment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  | 1,500,000 us-gaap_InterestCostsCapitalized / iart_AffectedAdjustmentPeriodAxis = iart_FirstThreeQuartersOf2012Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Full Year 2011 | Out-of-period Adjustment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  | 1,400,000 us-gaap_InterestCostsCapitalized / iart_AffectedAdjustmentPeriodAxis = iart_FullYear2011Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Last Quarter of 2010 | Out-of-period Adjustment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  | 400,000 us-gaap_InterestCostsCapitalized / iart_AffectedAdjustmentPeriodAxis = iart_LastQuarterOf2010Member / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Sales Revenue, Net |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk, percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember |  |  |  |  |  |
Concentration Risk, Number of Customers Over Benchmark | 0 iart_ConcentrationRiskNumberofCustomersOverBenchmark / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 0 iart_ConcentrationRiskNumberofCustomersOverBenchmark / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember | 0 iart_ConcentrationRiskNumberofCustomersOverBenchmark / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember |  |  |  |  |  |
Deferred tax accounts in 2011 error | Out-of-period Adjustment |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  |  |  |  |  |  | 900,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = iart_DeferredTaxAccountsin2011ErrorMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |
Confluent Surgical, Inc. |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment of Finite-lived Assets |  |  |  |  |  |  |  |  | $ 600,000 us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_BusinessAcquisitionAxis = iart_ConfluentSurgicalInc.Member

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