Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	$ 12,819
Additions	55
Net foreign currency translation	(46)
Amortization expense	(1,136)	(1,120)
Ending Balance	11,692
Capitalized Technology [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	10,216
Additions	0
Net foreign currency translation	(17)
Amortization expense	(1,021)
Ending Balance	9,178
Patents and Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	1,929
Additions	55
Net foreign currency translation	(1)
Amortization expense	(50)
Ending Balance	1,933
Other [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	674
Additions	0
Net foreign currency translation	(28)
Amortization expense	(65)
Ending Balance	$ 581