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Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 3,737,796 | $ 547,089
Backlog, intellectual property, patents, non-compete and other intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 2,689,022 | 15,328
Intangible assets, accumulated amortization | 76,059 | 42,446
Customer relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,048,774 | 531,761
Intangible assets, accumulated amortization | $ 183,933 | $ 158,533

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