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Fair value measurements - Additional Information (Detail) (Maximum [Member]) | 6 Months Ended
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Jun. 30, 2013
Maximum [Member] |
Financial Instruments And Fair Value Measurements [Line Items] |
Cash Equivalents Original Maturity Period | 90 days

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- Details
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Namespace Prefix: | ofix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Short Term Investment Maturity Period + References No definition available. + Details
Name: | ofix_ShortTermInvestmentMaturityPeriod
Namespace Prefix: | ofix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration