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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 22, 2019 | Feb. 25, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 22, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired |  |  |  | $ (2,981,552) | $ (38,277) |  |
Goodwill |  |  | $ 8,150,671 | 8,150,671 |  | $ 2,396,544 |
General Electric Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in estimated fair values for assets acquired |  |  | 23,700 |  |  |  |
Goodwill |  | $ 5,758,264 |  |  |  |  |
General Electric Company | Backlog |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in estimated fair values for assets acquired |  |  | 50,000 |  |  |  |
General Electric Company | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in estimated fair values for assets acquired |  |  | 20,000 |  |  |  |
GE Transportation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 1,617,100 |  |  |
Operating income |  |  |  | 88,200 |  |  |
Acquisition related costs |  |  |  | $ 55,300 |  |  |
Purchase price, net of cash acquired |  | 10,300,000 |  |  |  |  |
Cash payment for business acquisition |  | $ 470,000 |  |  |  |  |
Annax |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired | $ (45,200) |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 38,511
Cash payment for business acquisition |  |  | $ 10,100 |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  | 11,715
Annax | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  | 7,500
Intangible assets, weighted average useful life (years) | 20 years |  |  |  |  |  |
Annax | Trade Names |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  |  |  | $ 3,800

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