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Business segment information - Schedule of External Net Sales by SBU Reporting Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (14.00%)   (11.00%)  
Constant Currency Growth (as a percent) (15.00%)   (11.00%)  
Total Net Sales $ 92,738 $ 107,857 $ 294,391 $ 330,216
BioStim [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (25.00%)   (20.00%)  
Constant Currency Growth (as a percent) (28.00%)   (20.00%)  
Total Net Sales 31,604 42,310 108,445 134,741
Biologics [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) 2.00%      
Constant Currency Growth (as a percent) 2.00%      
Total Net Sales 13,212 12,951 39,827 39,792
Spine Fixation [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (7.00%)   (1.00%)  
Constant Currency Growth (as a percent) (7.00%)   (1.00%)  
Total Net Sales 23,221 25,001 71,994 72,972
Extremity Fixation [Member]
       
Segment Reporting Information [Line Items]        
Reported Growth (as a percent) (10.00%)   (10.00%)  
Constant Currency Growth (as a percent) (9.00%)   (8.00%)  
Total Net Sales $ 24,701 $ 27,595 $ 74,125 $ 82,711