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GOODWILL AND OTHER INTANGIBLE ASSETS - Components of Company's Identifiable Intangible Assets (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost $ 633,026,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill $ 639,648,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization (185,602,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (180,189,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net 447,424,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill 459,459,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
Completed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 18 years 18 years
Cost 343,942,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
345,082,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
Accumulated Amortization (67,172,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
(62,920,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
Net 276,770,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
282,162,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_CompletedTechnologyMember
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 12 years 12 years
Cost 158,546,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
162,031,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (88,817,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
(87,653,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
Net 69,729,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
74,378,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= us-gaap_CustomerRelationshipsMember
Trademarks/brand names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 34 years 34 years
Cost 42,713,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
44,520,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
Accumulated Amortization (15,457,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
(15,755,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
Net 27,256,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
28,765,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesMember
Trademarks/brand names indefinite    
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost 48,484,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
48,484,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
Accumulated Amortization 0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
Net 48,484,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
48,484,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_TrademarksBrandNamesIndefiniteMember
Supplier relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 27 years 27 years
Cost 34,721,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
34,721,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
Accumulated Amortization (11,166,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
(10,809,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
Net 23,555,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
23,912,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_SupplierRelationShipsMember
All other    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 4 years [1] 4 years [1]
Cost 4,620,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1] 4,810,000iart_CostOfDefiniteAndIndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1]
Accumulated Amortization (2,990,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1] (3,052,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1]
Net 1,630,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1] 1,758,000iart_DefiniteAndIndefiniteLivedIntangibleAssetsNetExcludingGoodwill
/ iart_ScheduleOfCompanysIdentifiableIntangibleAssetsAxis
= iart_AllOtherMember
[1]
In Process Research and Development    
Acquired Finite-Lived Intangible Assets [Line Items]    
Other Indefinite-lived Intangible Assets $ 1,400,000us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
$ 1,400,000us-gaap_OtherIndefiniteLivedIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
[1] At March 31, 2015 and December 31, 2014, all other included in-process research and development ("IPR&D") of $1.4 million in both periods, which was indefinite-lived.