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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (13.00%)   (9.00%)  
Constant Currency Growth (as a percent) (12.00%)   (10.00%)  
Total Net Sales $ 98,280 $ 113,423 $ 201,653 $ 222,359
Spine Repair Implants and Regenerative Biologics [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (3.00%)   1.00%  
Constant Currency Growth (as a percent) (10.00%)   1.00%  
Total Net Sales 33,953 35,135 70,233 69,528
Spine Regenerative Stimulation [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (18.00%)   (16.00%)  
Constant Currency Growth (as a percent) (21.00%)   (16.00%)  
Total Net Sales 34,088 41,759 67,832 80,549
Spine [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (12.00%)   (8.00%)  
Constant Currency Growth (as a percent) (16.00%)   (8.00%)  
Total Net Sales 68,041 76,894 138,065 150,077
Orthopedics [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (17.00%)   (12.00%)  
Constant Currency Growth (as a percent) (5.00%)   (11.00%)  
Total Net Sales $ 30,239 $ 36,529 $ 63,588 $ 72,282