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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
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Revenues | $ 215,059 | $ 196,652
Operating income | 8,738 | (2,190)
Intangible asset amortization | (3,033) | (3,551)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating income | 79,211 | 64,734
Operating Segments | U.S. Neurosurgery |  |
Segment Reporting Information [Line Items] |  |
Revenues | 54,383 | 38,996
Operating income | 27,788 | 17,768
Operating Segments | U.S. Instruments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 36,720 | 36,948
Operating income | 10,481 | 10,084
Operating Segments | U.S. Extremities |  |
Segment Reporting Information [Line Items] |  |
Revenues | 31,912 | 31,361
Operating income | 11,753 | 10,791
Operating Segments | U.S. Spine And Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 41,067 | 43,548
Operating income | 11,977 | 13,213
Operating Segments | International |  |
Segment Reporting Information [Line Items] |  |
Revenues | 50,977 | 45,799
Operating income | 17,212 | 12,878
Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Operating income | $ (67,440) | $ (63,373)

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