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Commitments and Contingencies - Capital Leases and Operating Leases Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Capital leases term of contract	2 years
Remaining term on operating lease	5 years
Rent expense	$ 41.2	$ 39.6	$ 17.7

X

- Definition

Term of the capital leases arrangement.

+ References

No definition available.

+ Details

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- Definition

Lessee Leasing Arrangements, Operating Leases, Remaining Term Of Contract

+ References

No definition available.

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- References

No definition available.

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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