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Business segment information - Schedule of Contribution Margin From Continuing Operations 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
Sales Information [Line Items]        
Total net margin $ 26,436 $ 40,451 $ 92,262 $ 119,682
General and administrative 13,202 13,850 46,736 42,715
Research and development 6,361 6,858 20,653 23,160
Amortization of intangible assets 616 565 1,725 1,725
Costs related to the accounting review and restatement 2,664    2,664   
Impairment of goodwill 19,193    19,193  
Charges related to U.S. Government resolutions   373   1,059
Operating income (loss) (15,600) 18,805 1,291 51,023
BioStim [Member]
       
Sales Information [Line Items]        
Total net margin 10,614 19,367 45,911 66,354
Impairment of goodwill         
Biologics [Member]
       
Sales Information [Line Items]        
Total net margin 6,743 5,664 18,472 16,524
Impairment of goodwill         
Spine Fixation [Member]
       
Sales Information [Line Items]        
Total net margin 1,227 4,693 7,489 13,379
Impairment of goodwill 9,368      
Extremity Fixation [Member]
       
Sales Information [Line Items]        
Total net margin 8,321 11,145 21,766 24,508
Impairment of goodwill 9,825      
Corporate [Member]
       
Sales Information [Line Items]        
Total net margin $ (469) $ (418) $ (1,376) $ (1,083)