Receivables - Installment Receivables by Class (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Total Installment Receivables
Non-Impaired installment receivables with no related allowance recorded	$ 1,008	$ 1,367
Impaired installment receivables with a related allowance recorded	6,801	7,552
Total installment receivables	7,809	8,919
Unpaid Principal Balance
Non-Impaired installment receivables with no related allowance recorded	962	1,306
Impaired installment receivables with a related allowance recorded	6,801	7,552
Total installment receivables	7,763	8,858
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	5,852	6,039
Interest Income Recognized
Non-Impaired installment receivables with no related allowance recorded	82	101
Impaired installment receivables with a related allowance recorded	0	0
Total installment receivables	82	101
U.S.
Total Installment Receivables
Impaired installment receivables with a related allowance recorded	6,735	7,464
Unpaid Principal Balance
Impaired installment receivables with a related allowance recorded	6,735	7,464
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	5,786	5,951
Interest Income Recognized
Impaired installment receivables with a related allowance recorded	0	0
CANADA
Total Installment Receivables
Non-Impaired installment receivables with no related allowance recorded	1,008	1,367
Impaired installment receivables with a related allowance recorded	66	88
Total installment receivables	1,074	1,455
Unpaid Principal Balance
Non-Impaired installment receivables with no related allowance recorded	962	1,306
Impaired installment receivables with a related allowance recorded	66	88
Total installment receivables	1,028	1,394
Related Allowance for Doubtful Accounts
Impaired installment receivables with a related allowance recorded	66	88
Interest Income Recognized
Non-Impaired installment receivables with no related allowance recorded	82	101
Impaired installment receivables with a related allowance recorded	0	0
Total installment receivables	$ 82	$ 101

Financing Receivable, Interest Income, Accrual Method

No definition available.

Name:	ivc_FinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Financing Receivable, Recorded Investment

+ References

No definition available.

+ Details

Name:	ivc_FinancingReceivableRecordedInvestment
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	ivc_FinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with No Related Allowance, Interest Income, Accrual Method

+ References

No definition available.

+ Details

Name:	ivc_FinancingReceivablewithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Financing Receivable, with No Related Allowance, Recorded Investment

+ References

No definition available.

+ Details

Name:	ivc_FinancingReceivablewithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with No Related Allowance, Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	ivc_FinancingReceivablewithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ivc_ImpairedFinancingReceivableRelatedAllowanceAbstract
Namespace Prefix:	ivc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethodAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalanceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: