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Restructuring charges - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended
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Dec. 31, 2010 Severance [Member] | Dec. 31, 2010 2010 plan [Member] | Jun. 30, 2010 2008 plan [Member] | Dec. 31, 2010 Spine [Member] 2010 plan [Member] Severance [Member] | Dec. 31, 2010 Orthopedics [Member] 2010 plan [Member] Severance [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Recognition of restructuring expense | $ 3,550,000 |  | $ 3,600,000 | $ 400,000 | $ 3,200,000
Restructuring Charges recorded in selling and marketing expenses |  | 1,600,000 |  |  |
Restructuring Charges recorded in general and administrative expenses |  | $ 2,000,000 |  |  |

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 + Details
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