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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 735,323 | $ 727,999
Sale of business, Gross Carrying Amount |  | (3,115)
Foreign currency translation, Gross Carrying Amount | 2,447 | 10,439
Ending balance, Goodwill Gross Carrying Amount | 737,770 | 735,323
Beginning balance, Accumulated Impairment (Loss) | (144,276) | (139,414)
Impairment loss, Accumulated Impairment (Loss) |  | (4,862)
Foreign currency translation, Accumulated Impairment (Loss) | 0 | 0
Ending balance, Accumulated Impairment (Loss) | (144,276) | (144,276)
Beginning balance, Goodwill Net | 591,047 | 588,585
Sale of business, Net |  | (3,115)
Impairment loss, Net |  | (4,862)
Foreign currency translation, Net | 2,447 | 10,439
Ending balance, Goodwill Net | $ 593,494 | $ 591,047

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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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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