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Commitments - Leases Narrative (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) ft² renewal_term	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Property and equipment | $	$ 200.4	$ 262.9
Rent expense | $	11.1	$ 12.5	$ 9.0
Leased Buildings - 6350 Sequence
Operating Leased Assets [Line Items]
Leased square footage | ft²		132,600
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive
Operating Leased Assets [Line Items]
Leased square footage | ft²		219,000
Leased Building
Operating Leased Assets [Line Items]
Leased square footage | ft²		87,000
Number of renewal terms | renewal_term		0
Leased Buildings -232 South Dobson Road
Operating Leased Assets [Line Items]
Leased square footage | ft²		148,800
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive
Operating Leased Assets [Line Items]
Number of renewal terms | renewal_term		2
Length of renewal term		5 years
Leased Buildings -232 South Dobson Road
Operating Leased Assets [Line Items]
Number of renewal terms | renewal_term		4
Length of renewal term		5 years
Leased Building
Operating Leased Assets [Line Items]
Property and equipment | $	$ 6.0	$ 6.0
Property, Plant and Equipment | Leased Building
Operating Leased Assets [Line Items]
Property and equipment | $			$ 6.0

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- Definition

Leased Square Footage

+ References

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- Definition

Lessee Leasing Arrangements, Operating Leases, Number of Renewal Term

+ References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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+ References

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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