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Summary of significant accounting policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 1 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 Unit | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Musculoskeletal Transplant Foundation ("MTF") [Member] | Dec. 31, 2012 Customers and distributors based in Europe [Member] | Dec. 31, 2012 Interest Expense [Member] | Jan. 31, 2012 Collaborative Arrangement [Member] Musculoskeletal Transplant Foundation ("MTF") [Member] Years | Dec. 31, 2012 Collaborative Arrangement [Member] Musculoskeletal Transplant Foundation ("MTF") [Member] | Dec. 31, 2011 Collaborative Arrangement [Member] Musculoskeletal Transplant Foundation ("MTF") [Member] | Dec. 31, 2010 Collaborative Arrangement [Member] Musculoskeletal Transplant Foundation ("MTF") [Member] | Dec. 31, 2009 Collaborative Arrangement [Member] Musculoskeletal Transplant Foundation ("MTF") [Member] Years | Dec. 31, 2012 Developed Technology [Member]
Foreign Currency Translation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transactional foreign currency gains and (losses), including those generated from intercompany operations |  |  |  |  |  |  |  |  | $ 500,000 | $ 1,600,000 | $ 100,000 |  |  |  |  |  |  |  |  |
Weighted average amortization period ( in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 years
Number of reporting units |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Period of agreement with MTF (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |
Extended Period of existing agreement with MTF (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |
Marketing fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,500,000 | 36,800,000 | 29,700,000 |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |
Advertising expense |  |  |  |  |  |  |  |  | 300,000 | 500,000 | 600,000 |  |  |  |  |  |  |  |  |
Expenditures for research and development |  |  |  |  |  |  |  |  | 28,577,000 | 22,861,000 | 27,958,000 | 3,000,000 |  |  |  |  |  |  |  |
Net Sales | $ 117,365,000 | $ 107,857,000 | $ 113,423,000 | $ 108,936,000 | $ 118,639,000 | $ 111,510,000 | $ 108,216,000 | $ 103,606,000 | $ 447,581,000 | $ 441,971,000 | $ 462,571,000 |  | $ 55,000,000 |  |  |  |  |  |  |

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