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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 |

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- Definition Intangible asset deduction in impairment charge. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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