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Business segment information - Operating Income (Loss) by GBU (Parenthetical) (Detail) (USD $)	9 Months Ended								3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011 Corporate [Member]	Sep. 30, 2012 Spine [Member]	Sep. 30, 2011 Spine [Member]	Sep. 30, 2012 Spine [Member] Strategic investments [Member]	Sep. 30, 2012 Orthopedics [Member]	Sep. 30, 2011 Orthopedics [Member]	Sep. 30, 2012 Orthopedics [Member] Strategic investments [Member]	Sep. 30, 2012 Orthopedics [Member] Strategic investments [Member]
Segment Reporting Information [Line Items]
Charges related to U.S. Government resolutions	$ 1,689,000	$ 46,000,000	$ 3,000,000	$ 1,500,000	$ 36,500,000		$ 200,000	$ 6,500,000
Arbitration resolution charges related to 2008 co-development agreement				3,100,000
Charge for costs related to the Company's strategic investment with MTF						2,300,000			500,000	700,000
Senior management succession charges			$ 3,200,000

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- Definition

Represents the amount of arbitration resolution charges related to 2008 co-development agreement recognized during the period.

+ References

No definition available.

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- Definition

Investment Expenses

+ References

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- Definition

Represents the senior management succession charges which is treated as operating loss.

+ References

No definition available.

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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