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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 331,795 | $ 290,323
Acquired goodwill, Gross Carrying Amount | 8,017 | 41,993
Foreign currency translation, Gross Carrying Amount | (836) | (521)
Ending balance, Goodwill Gross Carrying Amount | 338,976 | 331,795
Beginning balance, Accumulated Impairment (Loss) | (139,414) | (139,414)
Acquired goodwill, Accumulated Impairment (Loss) | 0 | 0
Foreign currency translation, Accumulated Impairment (Loss) | 0 | 0
Ending balance, Accumulated Impairment (Loss) | (139,414) | (139,414)
Beginning balance, Goodwill Net | 192,381 | 150,909
Acquired goodwill, Net | 8,017 | 41,993
Foreign currency translation, Net | (836) | (521)
Ending balance, Goodwill Net | $ 199,562 | $ 192,381

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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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