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Goodwill - Roll Forward of Goodwill (Detail) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Dec. 31, 2018	Jun. 30, 2018
Goodwill [Roll Forward]
Balance		$ 2,620,835	$ 2,577,435
Goodwill acquired	[1]	42,605	41,891
Foreign currency translation		(3,691)	1,509
Balance		2,659,749	2,620,835
Domestic
Goodwill [Roll Forward]
Balance		2,514,520	2,479,496
Goodwill acquired	[1]	42,704	35,024
Balance		2,557,224	2,514,520
International
Goodwill [Roll Forward]
Balance		106,315	97,939
Goodwill acquired	[1]	(99)	6,867
Foreign currency translation		(3,691)	1,509
Balance		$ 102,525	$ 106,315
[1] Includes goodwill initially allocated to new business combinations as well as measurement period adjustments.

X

- 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
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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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

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