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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, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Beginning Balance $ 1,189ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties $ 610ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties
Additions for current year tax positions 183us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 793us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decreases for prior year tax positions (12)ofix_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions (106)ofix_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions
Settlements of prior year tax positions (560)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities   
Expiration of statutes (77)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (108)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Ending Balance $ 723ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties $ 1,189ofix_UnrecognizedTaxBenefitsExcludingInterestAndPenalties