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Goodwill - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Carrying amount of goodwill | $ 0 |  |  | $ 0 |  | $ 0 | $ 19,800,000
Goodwill and intangible assets impairment | 0 | 20,484,000 |  | 0 | 49,821,000 |  |
Purchases of intangible assets |  |  | 22,800,000 |  |  |  |
Goodwill [Member] |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill and intangible assets impairment |  | $ 13,200,000 | $ 6,600,000 |  |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + 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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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Details
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