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Fair value measurement - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Fair Value Measurements [Line Items] |  |
Reversal of contingent consideration | $ 4,400,000 | $ 8,200,000
Contingent consideration liabilities | 20,829,000 | 33,433,000
Current portion of contingent consideration | 7,291,000 | 11,276,000
Minimum |  |
Fair Value Measurements [Line Items] |  |
Fair value of contingent consideration liability associated with future milestone | 7,000,000.0 |
Maximum |  |
Fair Value Measurements [Line Items] |  |
Fair value of contingent consideration liability associated with future milestone | 43,800,000.0 |
Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurements [Line Items] |  |
Contingent consideration liabilities | 20,829,000 | $ 33,433,000
Current portion of contingent consideration | 7,291,000 |
Other liabilities | $ 13,500,000 |

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- Definition Estimated fair value of contingent consideration in event company achieves specified milestones. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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