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Goodwill and Intangible Assets - Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 290,323 | $ 290,147
Acquired goodwill, Gross Carrying Amount | 41,993 |
Foreign currency translation, Gross Carrying Amount | 223 | 176
Ending balance, Goodwill Gross Carrying Amount | 332,539 | 290,323
Beginning balance, Accumulated Impairment (Loss) | (139,414) | (139,414)
Acquired goodwill, Accumulated Impairment (Loss) |  |
Foreign currency translation, Accumulated Impairment (Loss) |  |
Ending balance, Accumulated Impairment (Loss) | (139,414) | (139,414)
Beginning balance, Goodwill Net | 150,909 | 150,733
Acquired goodwill, Net | 41,993 |
Foreign currency translation, Net | 223 | 176
Ending balance, Goodwill Net | $ 193,125 | $ 150,909

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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=35741047&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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