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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 727,999 | $ 339,117
Acquired goodwill, Gross Carrying Amount |  | 396,027
Sale of business, Gross Carrying Amount | (3,115) |
Foreign currency translation, Gross Carrying Amount | 6,257 | (7,145)
Ending balance, Goodwill Gross Carrying Amount | 731,141 | 727,999
Beginning balance, Accumulated Impairment (Loss) | (139,414) | (139,414)
Acquired goodwill, Accumulated Impairment (Loss) | 0 | 0
Impairment loss, Accumulated Impairment (Loss) | (4,862) |
Foreign currency translation, Accumulated Impairment (Loss) | 0 | 0
Ending balance, Accumulated Impairment (Loss) | (144,276) | (139,414)
Beginning balance, Goodwill Net | 588,585 | 199,703
Acquired goodwill, Net |  | 396,027
Sale of business, Net | (3,115) |
Impairment loss, Net | (4,862) |
Foreign currency translation, Net | 6,257 | (7,145)
Ending balance, Goodwill Net | $ 586,865 | $ 588,585

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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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