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Business segment information - Operating Income (Loss) by GBU (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Operating Income (Loss) by GBU	$ 21,533	$ 23,599	$ 64,529	$ 15,498
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss) by GBU	(4,356)	(3,275)	(13,027)	(18,583)
Spine [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss) by GBU	22,615	22,373	65,209	28,239
Orthopedics [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss) by GBU	$ 3,274	$ 4,501	$ 12,347	$ 5,842

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- Details

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