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Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	$ 16,733
Additions	52
Net foreign currency translation	10
Amortization expense	(1,120)	(441)
Ending Balance	15,675
Capitalized Technology [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	13,776
Additions	0
Net foreign currency translation	2
Amortization expense	(998)
Ending Balance	12,780
Patents and Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	1,961
Additions	52
Net foreign currency translation	0
Amortization expense	(49)
Ending Balance	1,964
Other [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning Balance	996
Additions	0
Net foreign currency translation	8
Amortization expense	(73)
Ending Balance	$ 931

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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