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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.

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