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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