Summary of Gross Carrying Amount and Accumulated Amortization for Intangible Assets Resulting from Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Cost:
Beginning Balance	$ 15,917
Currency translation adjustment	(31)
Ending Balance	15,886
Accumulated Amortization:
Beginning Balance	(5,733)
Amortization expense	(1,091)
Currency translation adjustment	32
Ending Balance	(6,792)
Intangible assets, net	9,094	10,184
Existing Technology
Acquired Intangible Assets By Major Class [Line Items]
Amortization period (in years)	11 years 9 months
Cost:
Beginning Balance	4,600
Ending Balance	4,600
Accumulated Amortization:
Beginning Balance	(1,466)
Amortization expense	(336)
Ending Balance	(1,802)
Intangible assets, net	2,798	3,134
Customer Relationship
Cost:
Beginning Balance	10,747
Currency translation adjustment	(31)
Ending Balance	10,716
Accumulated Amortization:
Beginning Balance	(3,697)
Amortization expense	(755)
Currency translation adjustment	32
Ending Balance	(4,420)
Intangible assets, net	6,296	7,050
Customer Relationship | Minimum
Acquired Intangible Assets By Major Class [Line Items]
Amortization period (in years)	4 years
Customer Relationship | Maximum
Acquired Intangible Assets By Major Class [Line Items]
Amortization period (in years)	11 years 9 months
Trade Names
Acquired Intangible Assets By Major Class [Line Items]
Amortization period (in years)	1 year
Cost:
Beginning Balance	570
Ending Balance	570
Accumulated Amortization:
Beginning Balance	(570)
Ending Balance	$ (570)