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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 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 + Details
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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 + Details
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