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Business segment information - Selected Financial Information by Reporting Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Related Capital Expenditure And Depreciation And Amortization On Those Expenditure [Line Items] |  |  |
Depreciation and amortization | $ 20,580 | $ 23,017 | $ 22,087
Spine [Member] |  |  |
Segment Related Capital Expenditure And Depreciation And Amortization On Those Expenditure [Line Items] |  |  |
Depreciation and amortization | 12,260 | 11,091 | 8,973
Orthopedics [Member] |  |  |
Segment Related Capital Expenditure And Depreciation And Amortization On Those Expenditure [Line Items] |  |  |
Depreciation and amortization | 5,605 | 5,506 | 6,282
Corporate [Member] |  |  |
Segment Related Capital Expenditure And Depreciation And Amortization On Those Expenditure [Line Items] |  |  |
Depreciation and amortization | $ 280 | $ 263 | $ 126

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: 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 + Details
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