Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 3,269,225		$ 3,346,838
Acquisitions, including post acquisition adjustments	79,570		143,469
Divestitures and deconsolidations	(1,957)		(33,102)
Impairment			(74,359)
Goodwill, end of period	3,346,838	$ 3,269,225	$ 3,382,846
Predecessor
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 2,414,572	1,555,204
Acquisitions, including post acquisition adjustments		859,543
Divestitures and deconsolidations		(175)
Goodwill, end of period		$ 2,414,572

Goodwill, Written Off Related To Sale Of Business Unit And Deconsolidations

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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