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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands | Mar. 22, 2019 | 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] |  |  |  |
Purchase price, net of cash acquired |  |  |  | $ 28,667
Goodwill |  |  |  | 27,188
Escrow deposits |  | $ 13,200 |  |
Goodwill and other intangible assets acquired |  |  |  | 38,900
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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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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