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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	$ 4,024	$ 22,431
Spine [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	11,845	21,566
Orthopedics [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	958	4,979
Corporate [Member]
Product Type Reporting Information [Line Items]
Operating Income (Loss) by GBU	$ (8,779)	$ (4,114)

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- Definition

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

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