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Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2012
Jun. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Impairment loss $ 22,800,000    
Purchased intangible assets net   2,467,000 2,915,000
Intangible assets accumulated amortization   10,304,000 9,856,000
Acquired software licenses [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Purchased intangible assets net   168,000 248,000
Intangible assets accumulated amortization   $ 2,200,000 $ 2,100,000