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SEGMENT AND GEOGRAPHIC INFORMATION - Net Sales and Profit by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenues $ 231,351 $ 205,547 $ 446,410 $ 402,199
Operating income 12,392 5,556 [1] 21,130 3,366 [1]
Intangible asset amortization (2,985) (3,073) [1] (6,018) (6,624) [1]
U.S. Neurosurgery
        
Segment Reporting Information [Line Items]        
Revenues     114,942 80,763
Operating income     58,357 36,690
Operating Segments
        
Segment Reporting Information [Line Items]        
Operating income 88,455 70,851 167,666 133,638
Operating Segments | U.S. Neurosurgery
        
Segment Reporting Information [Line Items]        
Revenues 60,559 41,767    
Operating income 30,569 19,786    
Operating Segments | U.S. Instruments
        
Segment Reporting Information [Line Items]        
Revenues 39,505 41,048 76,225 78,896
Operating income 11,832 12,136 22,313 22,250
Operating Segments | U.S. Extremities
        
Segment Reporting Information [Line Items]        
Revenues 34,424 32,009 66,337 61,971
Operating income 14,171 11,943 25,924 21,495
Operating Segments | U.S. Spine And Other
        
Segment Reporting Information [Line Items]        
Revenues 45,087 43,434 86,153 87,481
Operating income 14,716 12,636 26,693 26,199
Operating Segments | International
        
Segment Reporting Information [Line Items]        
Revenues 51,776 47,289 102,753 93,088
Operating income 17,167 14,350 34,379 27,004
Corporate, Non-Segment
        
Segment Reporting Information [Line Items]        
Operating income $ (73,078) $ (62,222) $ (140,518) $ (123,648)
[1] See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.