Patents and Other Intangible Assets - Schedule of Patents and Other Intangibles Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 43,264ofix_IntangibleAssetsGross	$ 43,188ofix_IntangibleAssetsGross
Accumulated amortization	(36,112)	(34,142)
Patents and other intangible assets, net	7,152	9,046
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	35,420	34,820
Accumulated amortization	(33,319)	(31,739)
Trademarks—finite lived [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	596	620
Accumulated amortization	(469)	(454)
Licenses and other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	7,248	7,748
Accumulated amortization	$ (2,324)	$ (1,949)

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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