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Business segment information - Schedule of External Net Sales by GBU Reporting Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (5.00%)  
Constant Currency Decline (as a percent) (7.00%)  
Total Net Sales $ 103,373 $ 108,936
Spine Repair Implants and Regenerative Biologics [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) 5.00%  
Constant Currency Decline (as a percent) 0.00%  
Total Net Sales 36,280 34,393
Spine Regenerative Stimulation [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (13.00%)  
Constant Currency Decline (as a percent) (17.00%)  
Total Net Sales 33,744 38,790
Spine [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (4.00%)  
Constant Currency Decline (as a percent) (9.00%)  
Total Net Sales 70,024 73,183
Orthopedics [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (7.00%)  
Constant Currency Decline (as a percent) (3.00%)  
Total Net Sales $ 33,349 $ 35,753