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Acquisitions - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 22, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 8,142,473 | $ 2,396,544 |
Annax |  |  |
Business Acquisition [Line Items] |  |  |
Current assets |  |  | $ 32,831
Property, plant & equipment |  |  | 674
Goodwill |  |  | 27,188
Other intangible assets |  |  | 11,715
Total assets acquired |  |  | 72,408
Total liabilities assumed |  |  | (43,741)
Net assets acquired |  |  | $ 28,667

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