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Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Excluding Interest and Penalties) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Beginning Balance $ 723ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties $ 1,189ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties
Additions for current year tax positions 14,794us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 183us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Increases (decreases) for prior year tax positions 145ofix_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions (12)ofix_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions
Settlements of prior year tax positions   (560)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Expiration of statutes (65)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (77)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Ending Balance $ 15,597ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties $ 723ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties