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Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  | 3 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Granville-Phillips [Member] | May 30, 2014 Granville-Phillips [Member] | Mar. 31, 2014 Alter S.r.l [Member]
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 193,125 | $ 150,909 | $ 150,733 | $ 41,612 | $ 41,612 |
Acquisition purchase price adjustment |  |  |  |  |  | $ 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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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 -Subparagraph (g) -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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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