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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill, gross |  | $ 296,502
Accumulated impairment losses |  | (46,738)
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 249,764 |
Goodwill acquired during period | 117,715 |
Foreign currency translation | 170 |
Goodwill at March 31, 2014 | 367,649 |
U.S. Neurosurgery |  |
Goodwill [Line Items] |  |
Goodwill, gross |  | 95,165
Accumulated impairment losses |  |
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 95,165 |
Goodwill acquired during period | 94,315 |
Foreign currency translation | 88 |
Goodwill at March 31, 2014 | 189,568 |
U.S. Instruments |  |
Goodwill [Line Items] |  |
Goodwill, gross |  | 58,033
Accumulated impairment losses |  |
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 58,033 |
Goodwill acquired during period | 0 |
Foreign currency translation | 27 |
Goodwill at March 31, 2014 | 58,060 |
U.S. Extremities |  |
Goodwill [Line Items] |  |
Goodwill, gross |  | 61,079
Accumulated impairment losses |  |
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 61,079 |
Goodwill acquired during period | 0 |
Foreign currency translation | 28 |
Goodwill at March 31, 2014 | 61,107 |
U.S. Spine And Other |  |
Goodwill [Line Items] |  |
Goodwill, gross |  | 56,325
Accumulated impairment losses |  | (46,738)
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 9,587 |
Goodwill acquired during period | 0 |
Foreign currency translation | 4 |
Goodwill at March 31, 2014 | 9,591 |
International |  |
Goodwill [Line Items] |  |
Goodwill, gross |  | 25,900
Accumulated impairment losses |  |
Goodwill [Roll Forward] |  |
Goodwill at December 31, 2013 | 25,900 |
Goodwill acquired during period | 23,400 |
Foreign currency translation | 23 |
Goodwill at March 31, 2014 | $ 49,323 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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