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Business segment information - Operating Income (Loss) by GBU (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	$ 8,087	$ 17,920
Spine [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	14,680	22,019
Orthopedics [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	2,041	71
Corporate [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	$ (8,634)	$ (4,170)

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- Definition

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

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