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Accounting Policies - Goodwill and Other Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets $ 1,356us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ 167us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ 1,523us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill $ 773us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill  
Institutional Products Group          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets     1,356us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
677us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
13,041us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
Institutional Products Group | Customer lists          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets     442us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
  12,826us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
Institutional Products Group | Developed technology          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets     223us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
398us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
 
Institutional Products Group | Noncompete Agreements          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets         215us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
Institutional Products Group | Trademarks with definite life          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets     123us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ivc_TrademarksFiniteLivedIntangibleAssetsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
   
North America/HME | Customer lists          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets     167us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_NorthAmericaHomeMedicalEquipmentMember
   
North America/HME | Patents          
Finite-Lived Intangible Assets [Line Items]          
Impairment of finite-lived intangible assets       96us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_NorthAmericaHomeMedicalEquipmentMember
 
Trademarks | Institutional Products Group          
Indefinite-lived Intangible Assets [Line Items]          
Impairment of indefinite-lived intangible assets     $ 568us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember
$ 279us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementBusinessSegmentsAxis
= ivc_InstitutionalProductsGroupMember