Segment Information (Details Textual)	3 Months Ended
Mar. 31, 2012
Segment Information (Textual)
Share of revenue from other healthcare related services	Less than 1 percent

Share of revenue from other healthcare related services.

No definition available.

Name:	zmh_ShareOfRevenueFromOtherHealthcareRelatedServices
Namespace Prefix:	zmh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration