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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) (14.00%)  
Constant Currency Decline (as a percent) (13.00%)  
Total Net Sales $ 100,254 $ 116,042
Spine Repair Implants and Regenerative Biologics [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (4.00%)  
Constant Currency Decline (as a percent) (4.00%)  
Total Net Sales 34,297 35,757
Spine Regenerative Stimulation [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (18.00%)  
Constant Currency Decline (as a percent) (18.00%)  
Total Net Sales 32,029 39,271
Spine [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (12.00%)  
Constant Currency Decline (as a percent) (12.00%)  
Total Net Sales 66,326 75,028
Orthopedics [Member]
   
Segment Reporting Information [Line Items]    
Reported Decline (as a percent) (17.00%)  
Constant Currency Decline (as a percent) (16.00%)  
Total Net Sales $ 33,928 $ 41,014