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Interim Financial Information - Narrative (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                        
Charges $ 2,705,000us-gaap_RestructuringCharges $ 4,077,000us-gaap_RestructuringCharges $ 2,090,000us-gaap_RestructuringCharges $ 2,240,000us-gaap_RestructuringCharges $ 2,338,000us-gaap_RestructuringCharges $ 1,884,000us-gaap_RestructuringCharges $ 2,592,000us-gaap_RestructuringCharges $ 2,522,000us-gaap_RestructuringCharges $ 11,112,000us-gaap_RestructuringCharges $ 9,336,000us-gaap_RestructuringCharges $ 11,395,000us-gaap_RestructuringCharges $ 10,534,000us-gaap_RestructuringCharges
Restructuring charges, net of tax 2,732,000ivc_RestructuringChargesNetOfTax 3,842,000ivc_RestructuringChargesNetOfTax 1,711,000ivc_RestructuringChargesNetOfTax 1,811,000ivc_RestructuringChargesNetOfTax 1,991,000ivc_RestructuringChargesNetOfTax 1,765,000ivc_RestructuringChargesNetOfTax 1,899,000ivc_RestructuringChargesNetOfTax 1,838,000ivc_RestructuringChargesNetOfTax        
Restructuring charges, net of tax, per diluted share $ 0.09ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.12ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.05ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.06ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.06ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.06ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.06ivc_RestructuringChargesNetOfTaxPerDilutedShare $ 0.06ivc_RestructuringChargesNetOfTaxPerDilutedShare        
Product warranty expense   9,256,000us-gaap_ProductWarrantyExpense   2,237,000us-gaap_ProductWarrantyExpense 3,402,000us-gaap_ProductWarrantyExpense   3,862,000us-gaap_ProductWarrantyExpense          
Product warranty expense, net of tax   8,701,000ivc_ProductWarrantyExpenseNetofTax   2,100,000ivc_ProductWarrantyExpenseNetofTax 3,308,000ivc_ProductWarrantyExpenseNetofTax   3,862,000ivc_ProductWarrantyExpenseNetofTax          
Product warranty expense, net of tax, per diluted share   $ 0.27ivc_ProductWarrantyExpenseNetofTaxPerDilutedShare   $ 0.07ivc_ProductWarrantyExpenseNetofTaxPerDilutedShare $ 0.10ivc_ProductWarrantyExpenseNetofTaxPerDilutedShare   $ 0.12ivc_ProductWarrantyExpenseNetofTaxPerDilutedShare          
Write off of debt fees       1,070,000us-gaap_WriteOffOfDeferredDebtIssuanceCost     1,216,000us-gaap_WriteOffOfDeferredDebtIssuanceCost          
Write off of debt fees, net of tax       1,070,000ivc_WriteoffofDeferredDebtIssuanceCostNetofTax     1,216,000ivc_WriteoffofDeferredDebtIssuanceCostNetofTax          
Write off of debt fees per diluted share       $ 0.03ivc_WriteoffofDeferredDebtIssuanceCostNetofTaxPerDilutedShare     $ 0.04ivc_WriteoffofDeferredDebtIssuanceCostNetofTaxPerDilutedShare          
Intangible asset write downs 4,788,000us-gaap_GoodwillAndIntangibleAssetImpairment 8,253,000us-gaap_GoodwillAndIntangibleAssetImpairment                    
Intangible asset write downs, net of tax 4,788,000ivc_GoodwillAndIntangibleAssetImpairmentNetOfTax 8,253,000ivc_GoodwillAndIntangibleAssetImpairmentNetOfTax                    
Intangible asset write downs per diluted share $ 0.15ivc_GoodwillAndIntangibleAssetImpairmentNetOfTaxPerDilutedShare $ 0.26ivc_GoodwillAndIntangibleAssetImpairmentNetOfTaxPerDilutedShare                    
Tax benefit (expense) from intra-period allocation 2,700,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation 1,550,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation     (10,000,000)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation 3,800,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation   15,500,000us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation (7,175,000)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation (3,455,000)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation (9,230,000)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation  
Tax benefit (expense) from intra-period allocation per diluted share $ 0.08ivc_IncomeTaxExpenseBenefitIntraperiodTaxAllocationPerDilutedShare $ 0.05ivc_IncomeTaxExpenseBenefitIntraperiodTaxAllocationPerDilutedShare     $ (0.32)ivc_IncomeTaxExpenseBenefitIntraperiodTaxAllocationPerDilutedShare $ 0.12ivc_IncomeTaxExpenseBenefitIntraperiodTaxAllocationPerDilutedShare   $ 0.49ivc_IncomeTaxExpenseBenefitIntraperiodTaxAllocationPerDilutedShare        
Discrete income tax expense             9,700,000ivc_IncomeTaxExpenseBenefitDiscreteTaxEffect          
Discrete income tax expense per diluted share             $ 0.30ivc_IncomeTaxExpenseBenefitDiscreteTaxEffectPerDilutedShare          
Valuation tax expense           3,100,000ivc_DeferredTaxAssetValuationAllowanceExpense            
Valuation tax expense per diluted share           $ 0.10ivc_DeferredTaxAssetValuationAllowanceExpensePerDilutedShare            
Impairment of intangible assets         1,356,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 167,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill       1,523,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 773,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill  
Impairment of intangible assets, net of tax         1,155,000ivc_ImpairmentofIntangibleAssetsExcludingGoodwillNetofTax 167,000ivc_ImpairmentofIntangibleAssetsExcludingGoodwillNetofTax            
Valuation tax expense per diluted share         $ 0.04ivc_ImpairmentofIntangibleAssetsExcludingGoodwillNetofTaxPerDilutedShare $ 0.01ivc_ImpairmentofIntangibleAssetsExcludingGoodwillNetofTaxPerDilutedShare            
Value added tax adjustment         $ 1,389,000ivc_IncomeTaxExpenseBenefitAdjustmentsforValueAddedTax              
Value added tax adjustment per diluted share         $ 0.04ivc_IncomeTaxExpenseBenefitAdjustmentsforValueAddedTaxPerDilutedShare