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Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 3,739,470 | $ 547,089
Intellectual property, patents, non-compete and other intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 2,697,919 | 15,328
Intangible assets, accumulated amortization | 51,127 | 42,446
Customer relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,041,551 | 531,761
Intangible assets, accumulated amortization | $ 168,774 | $ 158,533

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