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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 731,272 | $ 735,323
Acquired goodwill | 472,695 | 0
Foreign currency translation, Gross Carrying Amount | (1,024) | (4,051)
Ending balance, Goodwill Gross Carrying Amount | 1,202,943 | 731,272
Beginning balance, Accumulated Impairment Loss | (144,276) | (144,276)
Acquired goodwill | 0 | 0
Foreign currency translation, Accumulated Impairment Loss | 0 | 0
Ending balance, Accumulated Impairment Loss | (144,276) | (144,276)
Beginning balance, Goodwill Net | 586,996 | 591,047
Acquired goodwill | 1,058,667 | 586,996
Foreign currency translation, Net | (1,024) | (4,051)
Ending balance, Goodwill Net | $ 1,058,667 | $ 586,996

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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