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Receivables (Installment Receivables by Class) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Total Installment Receivables    
Non-Impaired installment receivables with no related allowance recorded $ 988ivc_FinancingReceivablewithNoRelatedAllowanceRecordedInvestment $ 1,008ivc_FinancingReceivablewithNoRelatedAllowanceRecordedInvestment
Impaired installment receivables with a related allowance recorded 6,747us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment 6,801us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Total installment receivables 7,735ivc_FinancingReceivableRecordedInvestment 7,809ivc_FinancingReceivableRecordedInvestment
Unpaid Principal Balance    
Non-Impaired installment receivables with no related allowance recorded 941ivc_FinancingReceivablewithNoRelatedAllowanceUnpaidPrincipalBalance 962ivc_FinancingReceivablewithNoRelatedAllowanceUnpaidPrincipalBalance
Impaired installment receivables with a related allowance recorded 6,747us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance 6,801us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Total installment receivables 7,688ivc_FinancingReceivableUnpaidPrincipalBalance 7,763ivc_FinancingReceivableUnpaidPrincipalBalance
Related Allowance for Doubtful Accounts    
Impaired installment receivables with a related allowance recorded 5,571us-gaap_ImpairedFinancingReceivableRelatedAllowance 5,852us-gaap_ImpairedFinancingReceivableRelatedAllowance
Interest Income Recognized    
Non-Impaired installment receivables with no related allowance recorded 10ivc_FinancingReceivablewithNoRelatedAllowanceInterestIncomeAccrualMethod 82ivc_FinancingReceivablewithNoRelatedAllowanceInterestIncomeAccrualMethod
Impaired installment receivables with a related allowance recorded 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Total installment receivables 10ivc_FinancingReceivableInterestIncomeAccrualMethod 82ivc_FinancingReceivableInterestIncomeAccrualMethod
U.S.    
Total Installment Receivables    
Impaired installment receivables with a related allowance recorded 6,668us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 6,735us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Unpaid Principal Balance    
Impaired installment receivables with a related allowance recorded 6,668us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 6,735us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Related Allowance for Doubtful Accounts    
Impaired installment receivables with a related allowance recorded 5,492us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 5,786us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Interest Income Recognized    
Impaired installment receivables with a related allowance recorded 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
CANADA    
Total Installment Receivables    
Non-Impaired installment receivables with no related allowance recorded 988ivc_FinancingReceivablewithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 1,008ivc_FinancingReceivablewithNoRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Impaired installment receivables with a related allowance recorded 79us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 66us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Total installment receivables 1,067ivc_FinancingReceivableRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 1,074ivc_FinancingReceivableRecordedInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Unpaid Principal Balance    
Non-Impaired installment receivables with no related allowance recorded 941ivc_FinancingReceivablewithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 962ivc_FinancingReceivablewithNoRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Impaired installment receivables with a related allowance recorded 79us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 66us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Total installment receivables 1,020ivc_FinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 1,028ivc_FinancingReceivableUnpaidPrincipalBalance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Related Allowance for Doubtful Accounts    
Impaired installment receivables with a related allowance recorded 79us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 66us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Interest Income Recognized    
Non-Impaired installment receivables with no related allowance recorded 10ivc_FinancingReceivablewithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 82ivc_FinancingReceivablewithNoRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Impaired installment receivables with a related allowance recorded 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 0us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA
Total installment receivables $ 10ivc_FinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA		 $ 82ivc_FinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_StatementBusinessSegmentsAxis
= country_CA