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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)