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Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]            
Impairment loss       $ 22,800,000    
Loss on goodwill and purchased intangible assets impairment 0   20,484,000   0 49,821,000
Deduction on impairment charges   300,000        
Purchased intangible assets net 2,243,000 2,915,000     2,243,000  
Intangible assets accumulated amortization 10,528,000 9,856,000     10,528,000  
Intangible assets [Member]
            
Finite-Lived Intangible Assets [Line Items]            
Loss on goodwill and purchased intangible assets impairment     7,300,000      
Acquired software licenses [Member]
            
Finite-Lived Intangible Assets [Line Items]            
Purchased intangible assets net 140,000 248,000     140,000  
Intangible assets accumulated amortization $ 2,200,000 $ 2,100,000     $ 2,200,000