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Debt - Covenants (Detail) - Revolving Credit Facility [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	May 31, 2018 USD ($)
Debt
Credit Facility, aggregate capacity	$ 2,750	$ 2,250
Debt to EBITDA ratio	3.5
Threshold aggregate consideration on acquisition	$ 200
Increased leverage ratio on achievement of acquisition	4.0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The ratio of debt to EBITDA required to be maintained under the terms of the debt agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the increased leverage ratio on achievement of acquisition with requisite aggregate consideration.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of threshold aggregate consideration on acquisition permitted under the revolving credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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