Other Long-Term Obligations - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Payments for deferred compensation arrangements	$ 2,545
Expected payments to retired executives	21,126
Expected payments within next 12 months	$ 3,527

Deferred Compensation, Cash Based Arrangement, Expected Payment within Next Twelve Months

No definition available.

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Namespace Prefix:	ivc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant