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Goodwill and Intangible Assets - Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract] |  |
Goodwill gross carrying amount, Beginning balance | $ 290,147 | $ 279,498
Acquired goodwill, gross |  | 9,989
Foreign currency translation | (33) | 660
Goodwill gross carrying amount, Ending balance | 290,114 | 290,147
Accumulated Impairment Loss, Beginning balance | (139,414) | (139,414)
Acquired goodwill, impairment loss |  |
Foreign currency translation, impairment loss |  |
Accumulated Impairment Loss, Ending balance | (139,414) | (139,414)
Goodwill, net, Beginning balance | 150,733 | 140,084
Acquired goodwill, net |  | 9,989
Foreign currency translation, net | (33) | 660
Goodwill, net, Ending balance | $ 150,700 | $ 150,733

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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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