v2.4.0.8
Goodwill and Other Purchased Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]          
Goodwill, impairment loss       $ 0  
Amortization of intangible assets 364,000   301,000 1,071,000 865,000
Additions to purchased intangible assets   4,500,000      
Purchased technology and other intangibles
          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets 794,000   634,000    
Purchased technologies
          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets 430,000   333,000 1,300,000 1,000,000
Estimated useful economic life       7 years  
Customer lists
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful economic life       7 years  
Leases
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful economic life       5 years  
Purchased intangible assets
          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets       $ 2,300,000 $ 1,900,000