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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 | $ 117,365 | $ 107,857 | $ 113,423 | $ 108,936 | $ 118,639 | $ 111,510 | $ 108,216 | $ 103,606 | $ 447,581 | $ 441,971 | $ 462,571
Spine Repair Implants and Regenerative Biologics [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 32.00% | 28.00% | 29.00%
Net Sales |  |  |  |  |  |  |  |  | 142,829 | 124,415 | 132,938
Spine Regenerative Stimulation [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 36.00% | 37.00% | 37.00%
Net Sales |  |  |  |  |  |  |  |  | 159,289 | 160,946 | 172,574
Spine [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 68.00% | 65.00% | 66.00%
Net Sales |  |  |  |  |  |  |  |  | 302,118 | 285,361 | 305,512
Orthopedics [Member] |  |  |  |  |  |  |  |  |  |  |
Product Type Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 32.00% | 35.00% | 34.00%
Net Sales |  |  |  |  |  |  |  |  | $ 145,463 | $ 156,610 | $ 157,059

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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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- 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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