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Business segment information - Business Segments by GBU (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Net Sales | $ 112,035 | $ 114,752 | $ 119,492 | $ 116,041 | $ 123,085 | $ 117,306 | $ 116,670 | $ 113,060 | $ 462,320 | $ 470,121 | $ 460,629
Spine Products Implants and Biologics [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 32.00% | 31.00% | 29.00%
Net Sales |  |  |  |  |  |  |  |  | 147,206 | 143,775 | 133,831
Spine Regenerative Stimulation [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 35.00% | 34.00% | 38.00%
Net Sales |  |  |  |  |  |  |  |  | 164,688 | 160,442 | 172,573
Spine [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 67.00% | 65.00% | 67.00%
Net Sales |  |  |  |  |  |  |  |  | 311,894 | 304,217 | 306,404
Orthopedics [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 33.00% | 35.00% | 33.00%
Net Sales |  |  |  |  |  |  |  |  | $ 150,426 | $ 165,904 | $ 154,225

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- Definition Represents the revenues of a reporting segment as a percent of total revenues of the reporting entity. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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