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Business segment information - Operating Income (Loss) by GBU (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Product Type Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) by GBU | $ 8,804 | $ 14,298 | $ 16,891 | $ 32,218
Spine [Member] |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) by GBU | 15,440 | 16,278 | 30,121 | 38,297
Orthopedics [Member] |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) by GBU | (1,110) | 2,521 | 930 | 2,592
Corporate [Member] |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) by GBU | $ (5,526) | $ (4,501) | $ (14,160) | $ (8,671)

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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